Merge branch 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

Pull x86 cleanups from Ingo Molnar:
 "This topic tree contains more commits than usual:

   - most of it are uaccess cleanups/reorganization by Al

   - there's a bunch of prototype declaration (--Wmissing-prototypes)
     cleanups

   - misc other cleanups all around the map"

* 'x86-cleanups-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: (36 commits)
  x86/mm/set_memory: Fix -Wmissing-prototypes warnings
  x86/efi: Add a prototype for efi_arch_mem_reserve()
  x86/mm: Mark setup_emu2phys_nid() static
  x86/jump_label: Move 'inline' keyword placement
  x86/platform/uv: Add a missing prototype for uv_bau_message_interrupt()
  kill uaccess_try()
  x86: unsafe_put-style macro for sigmask
  x86: x32_setup_rt_frame(): consolidate uaccess areas
  x86: __setup_rt_frame(): consolidate uaccess areas
  x86: __setup_frame(): consolidate uaccess areas
  x86: setup_sigcontext(): list user_access_{begin,end}() into callers
  x86: get rid of put_user_try in __setup_rt_frame() (both 32bit and 64bit)
  x86: ia32_setup_rt_frame(): consolidate uaccess areas
  x86: ia32_setup_frame(): consolidate uaccess areas
  x86: ia32_setup_sigcontext(): lift user_access_{begin,end}() into the callers
  x86/alternatives: Mark text_poke_loc_init() static
  x86/cpu: Fix a -Wmissing-prototypes warning for init_ia32_feat_ctl()
  x86/mm: Drop pud_mknotpresent()
  x86: Replace setup_irq() by request_irq()
  x86/configs: Slightly reduce defconfigs
  ...

15 files changed, 268 insertions, 306 deletions

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 15ac0d5f4b40..7867dfb3963e 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -1167,8 +1167,8 @@ static void text_poke_bp_batch(struct text_poke_loc *tp, unsigned int nr_entries
 		atomic_cond_read_acquire(&desc.refs, !VAL);
 }
 
-void text_poke_loc_init(struct text_poke_loc *tp, void *addr,
-			const void *opcode, size_t len, const void *emulate)
+static void text_poke_loc_init(struct text_poke_loc *tp, void *addr,
+			       const void *opcode, size_t len, const void *emulate)
 {
 	struct insn insn;
 
diff --git a/arch/x86/kernel/cpu/feat_ctl.c b/arch/x86/kernel/cpu/feat_ctl.c
index 0268185bef94..29a3bedabd06 100644
--- a/arch/x86/kernel/cpu/feat_ctl.c
+++ b/arch/x86/kernel/cpu/feat_ctl.c
@@ -5,6 +5,7 @@
 #include <asm/msr-index.h>
 #include <asm/processor.h>
 #include <asm/vmx.h>
+#include "cpu.h"
 
 #undef pr_fmt
 #define pr_fmt(fmt)	"x86/cpu: " fmt
diff --git a/arch/x86/kernel/cpu/umwait.c b/arch/x86/kernel/cpu/umwait.c
index c222f283b456..300e3fd5ade3 100644
--- a/arch/x86/kernel/cpu/umwait.c
+++ b/arch/x86/kernel/cpu/umwait.c
@@ -4,6 +4,7 @@
 #include <linux/cpu.h>
 
 #include <asm/msr.h>
+#include <asm/mwait.h>
 
 #define UMWAIT_C02_ENABLE	0
 
diff --git a/arch/x86/kernel/ioport.c b/arch/x86/kernel/ioport.c
index 8abeee0dd7bf..a53e7b4a7419 100644
--- a/arch/x86/kernel/ioport.c
+++ b/arch/x86/kernel/ioport.c
@@ -13,6 +13,7 @@
 
 #include <asm/io_bitmap.h>
 #include <asm/desc.h>
+#include <asm/syscalls.h>
 
 #ifdef CONFIG_X86_IOPL_IOPERM
 
diff --git a/arch/x86/kernel/irqinit.c b/arch/x86/kernel/irqinit.c
index 16919a9671fa..5aa523c2d573 100644
--- a/arch/x86/kernel/irqinit.c
+++ b/arch/x86/kernel/irqinit.c
@@ -44,15 +44,6 @@
  * (these are usually mapped into the 0x30-0xff vector range)
  */
 
-/*
- * IRQ2 is cascade interrupt to second interrupt controller
- */
-static struct irqaction irq2 = {
-	.handler = no_action,
-	.name = "cascade",
-	.flags = IRQF_NO_THREAD,
-};
-
 DEFINE_PER_CPU(vector_irq_t, vector_irq) = {
 	[0 ... NR_VECTORS - 1] = VECTOR_UNUSED,
 };
@@ -84,7 +75,7 @@ void __init init_IRQ(void)
 	 * On cpu 0, Assign ISA_IRQ_VECTOR(irq) to IRQ 0..15.
 	 * If these IRQ's are handled by legacy interrupt-controllers like PIC,
 	 * then this configuration will likely be static after the boot. If
-	 * these IRQ's are handled by more mordern controllers like IO-APIC,
+	 * these IRQs are handled by more modern controllers like IO-APIC,
 	 * then this vector space can be freed and re-used dynamically as the
 	 * irq's migrate etc.
 	 */
@@ -104,6 +95,9 @@ void __init native_init_IRQ(void)
 	idt_setup_apic_and_irq_gates();
 	lapic_assign_system_vectors();
 
-	if (!acpi_ioapic && !of_ioapic && nr_legacy_irqs())
-		setup_irq(2, &irq2);
+	if (!acpi_ioapic && !of_ioapic && nr_legacy_irqs()) {
+		/* IRQ2 is cascade interrupt to second interrupt controller */
+		if (request_irq(2, no_action, IRQF_NO_THREAD, "cascade", NULL))
+			pr_err("%s: request_irq() failed\n", "cascade");
+	}
 }
diff --git a/arch/x86/kernel/jump_label.c b/arch/x86/kernel/jump_label.c
index 9c4498ea0b3c..5ba8477c2cb7 100644
--- a/arch/x86/kernel/jump_label.c
+++ b/arch/x86/kernel/jump_label.c
@@ -58,7 +58,7 @@ __jump_label_set_jump_code(struct jump_entry *entry, enum jump_label_type type,
 	return code;
 }
 
-static void inline __jump_label_transform(struct jump_entry *entry,
+static inline void __jump_label_transform(struct jump_entry *entry,
 					  enum jump_label_type type,
 					  int init)
 {
diff --git a/arch/x86/kernel/nmi.c b/arch/x86/kernel/nmi.c
index 54c21d6abd5a..6407ea21fa1b 100644
--- a/arch/x86/kernel/nmi.c
+++ b/arch/x86/kernel/nmi.c
@@ -403,9 +403,9 @@ static void default_do_nmi(struct pt_regs *regs)
 	 * a 'real' unknown NMI.  For example, while processing
 	 * a perf NMI another perf NMI comes in along with a
 	 * 'real' unknown NMI.  These two NMIs get combined into
-	 * one (as descibed above).  When the next NMI gets
+	 * one (as described above).  When the next NMI gets
 	 * processed, it will be flagged by perf as handled, but
-	 * noone will know that there was a 'real' unknown NMI sent
+	 * no one will know that there was a 'real' unknown NMI sent
 	 * also.  As a result it gets swallowed.  Or if the first
 	 * perf NMI returns two events handled then the second
 	 * NMI will get eaten by the logic below, again losing a
diff --git a/arch/x86/kernel/reboot.c b/arch/x86/kernel/reboot.c
index 0cc7c0b106bb..3ca43be4f9cf 100644
--- a/arch/x86/kernel/reboot.c
+++ b/arch/x86/kernel/reboot.c
@@ -531,7 +531,7 @@ static void emergency_vmx_disable_all(void)
 
 	/*
 	 * We need to disable VMX on all CPUs before rebooting, otherwise
-	 * we risk hanging up the machine, because the CPU ignore INIT
+	 * we risk hanging up the machine, because the CPU ignores INIT
 	 * signals when VMX is enabled.
 	 *
 	 * We can't take any locks and we may be on an inconsistent
diff --git a/arch/x86/kernel/signal.c b/arch/x86/kernel/signal.c
index 0364f8c3bee3..83b74fb38c8f 100644
--- a/arch/x86/kernel/signal.c
+++ b/arch/x86/kernel/signal.c
@@ -45,24 +45,6 @@
 #include <asm/sigframe.h>
 #include <asm/signal.h>
 
-#define COPY(x)			do {			\
-	get_user_ex(regs->x, &sc->x);			\
-} while (0)
-
-#define GET_SEG(seg)		({			\
-	unsigned short tmp;				\
-	get_user_ex(tmp, &sc->seg);			\
-	tmp;						\
-})
-
-#define COPY_SEG(seg)		do {			\
-	regs->seg = GET_SEG(seg);			\
-} while (0)
-
-#define COPY_SEG_CPL3(seg)	do {			\
-	regs->seg = GET_SEG(seg) | 3;			\
-} while (0)
-
 #ifdef CONFIG_X86_64
 /*
  * If regs->ss will cause an IRET fault, change it.  Otherwise leave it
@@ -90,53 +72,58 @@ static void force_valid_ss(struct pt_regs *regs)
 	    ar != (AR_DPL3 | AR_S | AR_P | AR_TYPE_RWDATA_EXPDOWN))
 		regs->ss = __USER_DS;
 }
+# define CONTEXT_COPY_SIZE	offsetof(struct sigcontext, reserved1)
+#else
+# define CONTEXT_COPY_SIZE	sizeof(struct sigcontext)
 #endif
 
 static int restore_sigcontext(struct pt_regs *regs,
-			      struct sigcontext __user *sc,
+			      struct sigcontext __user *usc,
 			      unsigned long uc_flags)
 {
-	unsigned long buf_val;
-	void __user *buf;
-	unsigned int tmpflags;
-	unsigned int err = 0;
+	struct sigcontext sc;
 
 	/* Always make any pending restarted system calls return -EINTR */
 	current->restart_block.fn = do_no_restart_syscall;
 
-	get_user_try {
+	if (copy_from_user(&sc, usc, CONTEXT_COPY_SIZE))
+		return -EFAULT;
 
 #ifdef CONFIG_X86_32
-		set_user_gs(regs, GET_SEG(gs));
-		COPY_SEG(fs);
-		COPY_SEG(es);
-		COPY_SEG(ds);
+	set_user_gs(regs, sc.gs);
+	regs->fs = sc.fs;
+	regs->es = sc.es;
+	regs->ds = sc.ds;
 #endif /* CONFIG_X86_32 */
 
-		COPY(di); COPY(si); COPY(bp); COPY(sp); COPY(bx);
-		COPY(dx); COPY(cx); COPY(ip); COPY(ax);
+	regs->bx = sc.bx;
+	regs->cx = sc.cx;
+	regs->dx = sc.dx;
+	regs->si = sc.si;
+	regs->di = sc.di;
+	regs->bp = sc.bp;
+	regs->ax = sc.ax;
+	regs->sp = sc.sp;
+	regs->ip = sc.ip;
 
 #ifdef CONFIG_X86_64
-		COPY(r8);
-		COPY(r9);
-		COPY(r10);
-		COPY(r11);
-		COPY(r12);
-		COPY(r13);
-		COPY(r14);
-		COPY(r15);
+	regs->r8 = sc.r8;
+	regs->r9 = sc.r9;
+	regs->r10 = sc.r10;
+	regs->r11 = sc.r11;
+	regs->r12 = sc.r12;
+	regs->r13 = sc.r13;
+	regs->r14 = sc.r14;
+	regs->r15 = sc.r15;
 #endif /* CONFIG_X86_64 */
 
-		COPY_SEG_CPL3(cs);
-		COPY_SEG_CPL3(ss);
-
-		get_user_ex(tmpflags, &sc->flags);
-		regs->flags = (regs->flags & ~FIX_EFLAGS) | (tmpflags & FIX_EFLAGS);
-		regs->orig_ax = -1;		/* disable syscall checks */
+	/* Get CS/SS and force CPL3 */
+	regs->cs = sc.cs | 0x03;
+	regs->ss = sc.ss | 0x03;
 
-		get_user_ex(buf_val, &sc->fpstate);
-		buf = (void __user *)buf_val;
-	} get_user_catch(err);
+	regs->flags = (regs->flags & ~FIX_EFLAGS) | (sc.flags & FIX_EFLAGS);
+	/* disable syscall checks */
+	regs->orig_ax = -1;
 
 #ifdef CONFIG_X86_64
 	/*
@@ -147,70 +134,78 @@ static int restore_sigcontext(struct pt_regs *regs,
 		force_valid_ss(regs);
 #endif
 
-	err |= fpu__restore_sig(buf, IS_ENABLED(CONFIG_X86_32));
-
-	return err;
+	return fpu__restore_sig((void __user *)sc.fpstate,
+			       IS_ENABLED(CONFIG_X86_32));
 }
 
-int setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
+static __always_inline int
+__unsafe_setup_sigcontext(struct sigcontext __user *sc, void __user *fpstate,
 		     struct pt_regs *regs, unsigned long mask)
 {
-	int err = 0;
-
-	put_user_try {
-
 #ifdef CONFIG_X86_32
-		put_user_ex(get_user_gs(regs), (unsigned int __user *)&sc->gs);
-		put_user_ex(regs->fs, (unsigned int __user *)&sc->fs);
-		put_user_ex(regs->es, (unsigned int __user *)&sc->es);
-		put_user_ex(regs->ds, (unsigned int __user *)&sc->ds);
+	unsafe_put_user(get_user_gs(regs),
+				  (unsigned int __user *)&sc->gs, Efault);
+	unsafe_put_user(regs->fs, (unsigned int __user *)&sc->fs, Efault);
+	unsafe_put_user(regs->es, (unsigned int __user *)&sc->es, Efault);
+	unsafe_put_user(regs->ds, (unsigned int __user *)&sc->ds, Efault);
 #endif /* CONFIG_X86_32 */
 
-		put_user_ex(regs->di, &sc->di);
-		put_user_ex(regs->si, &sc->si);
-		put_user_ex(regs->bp, &sc->bp);
-		put_user_ex(regs->sp, &sc->sp);
-		put_user_ex(regs->bx, &sc->bx);
-		put_user_ex(regs->dx, &sc->dx);
-		put_user_ex(regs->cx, &sc->cx);
-		put_user_ex(regs->ax, &sc->ax);
+	unsafe_put_user(regs->di, &sc->di, Efault);
+	unsafe_put_user(regs->si, &sc->si, Efault);
+	unsafe_put_user(regs->bp, &sc->bp, Efault);
+	unsafe_put_user(regs->sp, &sc->sp, Efault);
+	unsafe_put_user(regs->bx, &sc->bx, Efault);
+	unsafe_put_user(regs->dx, &sc->dx, Efault);
+	unsafe_put_user(regs->cx, &sc->cx, Efault);
+	unsafe_put_user(regs->ax, &sc->ax, Efault);
 #ifdef CONFIG_X86_64
-		put_user_ex(regs->r8, &sc->r8);
-		put_user_ex(regs->r9, &sc->r9);
-		put_user_ex(regs->r10, &sc->r10);
-		put_user_ex(regs->r11, &sc->r11);
-		put_user_ex(regs->r12, &sc->r12);
-		put_user_ex(regs->r13, &sc->r13);
-		put_user_ex(regs->r14, &sc->r14);
-		put_user_ex(regs->r15, &sc->r15);
+	unsafe_put_user(regs->r8, &sc->r8, Efault);
+	unsafe_put_user(regs->r9, &sc->r9, Efault);
+	unsafe_put_user(regs->r10, &sc->r10, Efault);
+	unsafe_put_user(regs->r11, &sc->r11, Efault);
+	unsafe_put_user(regs->r12, &sc->r12, Efault);
+	unsafe_put_user(regs->r13, &sc->r13, Efault);
+	unsafe_put_user(regs->r14, &sc->r14, Efault);
+	unsafe_put_user(regs->r15, &sc->r15, Efault);
 #endif /* CONFIG_X86_64 */
 
-		put_user_ex(current->thread.trap_nr, &sc->trapno);
-		put_user_ex(current->thread.error_code, &sc->err);
-		put_user_ex(regs->ip, &sc->ip);
+	unsafe_put_user(current->thread.trap_nr, &sc->trapno, Efault);
+	unsafe_put_user(current->thread.error_code, &sc->err, Efault);
+	unsafe_put_user(regs->ip, &sc->ip, Efault);
 #ifdef CONFIG_X86_32
-		put_user_ex(regs->cs, (unsigned int __user *)&sc->cs);
-		put_user_ex(regs->flags, &sc->flags);
-		put_user_ex(regs->sp, &sc->sp_at_signal);
-		put_user_ex(regs->ss, (unsigned int __user *)&sc->ss);
+	unsafe_put_user(regs->cs, (unsigned int __user *)&sc->cs, Efault);
+	unsafe_put_user(regs->flags, &sc->flags, Efault);
+	unsafe_put_user(regs->sp, &sc->sp_at_signal, Efault);
+	unsafe_put_user(regs->ss, (unsigned int __user *)&sc->ss, Efault);
 #else /* !CONFIG_X86_32 */
-		put_user_ex(regs->flags, &sc->flags);
-		put_user_ex(regs->cs, &sc->cs);
-		put_user_ex(0, &sc->gs);
-		put_user_ex(0, &sc->fs);
-		put_user_ex(regs->ss, &sc->ss);
+	unsafe_put_user(regs->flags, &sc->flags, Efault);
+	unsafe_put_user(regs->cs, &sc->cs, Efault);
+	unsafe_put_user(0, &sc->gs, Efault);
+	unsafe_put_user(0, &sc->fs, Efault);
+	unsafe_put_user(regs->ss, &sc->ss, Efault);
 #endif /* CONFIG_X86_32 */
 
-		put_user_ex(fpstate, (unsigned long __user *)&sc->fpstate);
+	unsafe_put_user(fpstate, (unsigned long __user *)&sc->fpstate, Efault);
 
-		/* non-iBCS2 extensions.. */
-		put_user_ex(mask, &sc->oldmask);
-		put_user_ex(current->thread.cr2, &sc->cr2);
-	} put_user_catch(err);
-
-	return err;
+	/* non-iBCS2 extensions.. */
+	unsafe_put_user(mask, &sc->oldmask, Efault);
+	unsafe_put_user(current->thread.cr2, &sc->cr2, Efault);
+	return 0;
+Efault:
+	return -EFAULT;
 }
 
+#define unsafe_put_sigcontext(sc, fp, regs, set, label)			\
+do {									\
+	if (__unsafe_setup_sigcontext(sc, fp, regs, set->sig[0]))	\
+		goto label;						\
+} while(0);
+
+#define unsafe_put_sigmask(set, frame, label) \
+	unsafe_put_user(*(__u64 *)(set), \
+			(__u64 __user *)&(frame)->uc.uc_sigmask, \
+			label)
+
 /*
  * Set up a signal frame.
  */
@@ -310,26 +305,16 @@ __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
 {
 	struct sigframe __user *frame;
 	void __user *restorer;
-	int err = 0;
-	void __user *fpstate = NULL;
-
-	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
+	void __user *fp = NULL;
 
-	if (!access_ok(frame, sizeof(*frame)))
-		return -EFAULT;
+	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fp);
 
-	if (__put_user(sig, &frame->sig))
+	if (!user_access_begin(frame, sizeof(*frame)))
 		return -EFAULT;
 
-	if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
-		return -EFAULT;
-
-	if (_NSIG_WORDS > 1) {
-		if (__copy_to_user(&frame->extramask, &set->sig[1],
-				   sizeof(frame->extramask)))
-			return -EFAULT;
-	}
-
+	unsafe_put_user(sig, &frame->sig, Efault);
+	unsafe_put_sigcontext(&frame->sc, fp, regs, set, Efault);
+	unsafe_put_user(set->sig[1], &frame->extramask[0], Efault);
 	if (current->mm->context.vdso)
 		restorer = current->mm->context.vdso +
 			vdso_image_32.sym___kernel_sigreturn;
@@ -339,7 +324,7 @@ __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
 		restorer = ksig->ka.sa.sa_restorer;
 
 	/* Set up to return from userspace.  */
-	err |= __put_user(restorer, &frame->pretcode);
+	unsafe_put_user(restorer, &frame->pretcode, Efault);
 
 	/*
 	 * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
@@ -348,10 +333,8 @@ __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
 	 * reasons and because gdb uses it as a signature to notice
 	 * signal handler stack frames.
 	 */
-	err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode);
-
-	if (err)
-		return -EFAULT;
+	unsafe_put_user(*((u64 *)&retcode), (u64 *)frame->retcode, Efault);
+	user_access_end();
 
 	/* Set up registers for signal handler */
 	regs->sp = (unsigned long)frame;
@@ -366,6 +349,10 @@ __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
 	regs->cs = __USER_CS;
 
 	return 0;
+
+Efault:
+	user_access_end();
+	return -EFAULT;
 }
 
 static int __setup_rt_frame(int sig, struct ksignal *ksig,
@@ -373,50 +360,45 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig,
 {
 	struct rt_sigframe __user *frame;
 	void __user *restorer;
-	int err = 0;
-	void __user *fpstate = NULL;
+	void __user *fp = NULL;
 
-	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
+	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fp);
 
-	if (!access_ok(frame, sizeof(*frame)))
+	if (!user_access_begin(frame, sizeof(*frame)))
 		return -EFAULT;
 
-	put_user_try {
-		put_user_ex(sig, &frame->sig);
-		put_user_ex(&frame->info, &frame->pinfo);
-		put_user_ex(&frame->uc, &frame->puc);
+	unsafe_put_user(sig, &frame->sig, Efault);
+	unsafe_put_user(&frame->info, &frame->pinfo, Efault);
+	unsafe_put_user(&frame->uc, &frame->puc, Efault);
 
-		/* Create the ucontext.  */
-		if (static_cpu_has(X86_FEATURE_XSAVE))
-			put_user_ex(UC_FP_XSTATE, &frame->uc.uc_flags);
-		else
-			put_user_ex(0, &frame->uc.uc_flags);
-		put_user_ex(0, &frame->uc.uc_link);
-		save_altstack_ex(&frame->uc.uc_stack, regs->sp);
+	/* Create the ucontext.  */
+	if (static_cpu_has(X86_FEATURE_XSAVE))
+		unsafe_put_user(UC_FP_XSTATE, &frame->uc.uc_flags, Efault);
+	else
+		unsafe_put_user(0, &frame->uc.uc_flags, Efault);
+	unsafe_put_user(0, &frame->uc.uc_link, Efault);
+	unsafe_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
 
-		/* Set up to return from userspace.  */
-		restorer = current->mm->context.vdso +
-			vdso_image_32.sym___kernel_rt_sigreturn;
-		if (ksig->ka.sa.sa_flags & SA_RESTORER)
-			restorer = ksig->ka.sa.sa_restorer;
-		put_user_ex(restorer, &frame->pretcode);
+	/* Set up to return from userspace.  */
+	restorer = current->mm->context.vdso +
+		vdso_image_32.sym___kernel_rt_sigreturn;
+	if (ksig->ka.sa.sa_flags & SA_RESTORER)
+		restorer = ksig->ka.sa.sa_restorer;
+	unsafe_put_user(restorer, &frame->pretcode, Efault);
 
-		/*
-		 * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
-		 *
-		 * WE DO NOT USE IT ANY MORE! It's only left here for historical
-		 * reasons and because gdb uses it as a signature to notice
-		 * signal handler stack frames.
-		 */
-		put_user_ex(*((u64 *)&rt_retcode), (u64 *)frame->retcode);
-	} put_user_catch(err);
+	/*
+	 * This is movl $__NR_rt_sigreturn, %ax ; int $0x80
+	 *
+	 * WE DO NOT USE IT ANY MORE! It's only left here for historical
+	 * reasons and because gdb uses it as a signature to notice
+	 * signal handler stack frames.
+	 */
+	unsafe_put_user(*((u64 *)&rt_retcode), (u64 *)frame->retcode, Efault);
+	unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
+	unsafe_put_sigmask(set, frame, Efault);
+	user_access_end();
 	
-	err |= copy_siginfo_to_user(&frame->info, &ksig->info);
-	err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
-				regs, set->sig[0]);
-	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
-	if (err)
+	if (copy_siginfo_to_user(&frame->info, &ksig->info))
 		return -EFAULT;
 
 	/* Set up registers for signal handler */
@@ -432,6 +414,9 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig,
 	regs->cs = __USER_CS;
 
 	return 0;
+Efault:
+	user_access_end();
+	return -EFAULT;
 }
 #else /* !CONFIG_X86_32 */
 static unsigned long frame_uc_flags(struct pt_regs *regs)
@@ -455,43 +440,34 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig,
 	struct rt_sigframe __user *frame;
 	void __user *fp = NULL;
 	unsigned long uc_flags;
-	int err = 0;
+
+	/* x86-64 should always use SA_RESTORER. */
+	if (!(ksig->ka.sa.sa_flags & SA_RESTORER))
+		return -EFAULT;
 
 	frame = get_sigframe(&ksig->ka, regs, sizeof(struct rt_sigframe), &fp);
+	uc_flags = frame_uc_flags(regs);
 
-	if (!access_ok(frame, sizeof(*frame)))
+	if (!user_access_begin(frame, sizeof(*frame)))
 		return -EFAULT;
 
+	/* Create the ucontext.  */
+	unsafe_put_user(uc_flags, &frame->uc.uc_flags, Efault);
+	unsafe_put_user(0, &frame->uc.uc_link, Efault);
+	unsafe_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
+
+	/* Set up to return from userspace.  If provided, use a stub
+	   already in userspace.  */
+	unsafe_put_user(ksig->ka.sa.sa_restorer, &frame->pretcode, Efault);
+	unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
+	unsafe_put_sigmask(set, frame, Efault);
+	user_access_end();
+
 	if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
 		if (copy_siginfo_to_user(&frame->info, &ksig->info))
 			return -EFAULT;
 	}
 
-	uc_flags = frame_uc_flags(regs);
-
-	put_user_try {
-		/* Create the ucontext.  */
-		put_user_ex(uc_flags, &frame->uc.uc_flags);
-		put_user_ex(0, &frame->uc.uc_link);
-		save_altstack_ex(&frame->uc.uc_stack, regs->sp);
-
-		/* Set up to return from userspace.  If provided, use a stub
-		   already in userspace.  */
-		/* x86-64 should always use SA_RESTORER. */
-		if (ksig->ka.sa.sa_flags & SA_RESTORER) {
-			put_user_ex(ksig->ka.sa.sa_restorer, &frame->pretcode);
-		} else {
-			/* could use a vstub here */
-			err |= -EFAULT;
-		}
-	} put_user_catch(err);
-
-	err |= setup_sigcontext(&frame->uc.uc_mcontext, fp, regs, set->sig[0]);
-	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
-
-	if (err)
-		return -EFAULT;
-
 	/* Set up registers for signal handler */
 	regs->di = sig;
 	/* In case the signal handler was declared without prototypes */
@@ -528,6 +504,10 @@ static int __setup_rt_frame(int sig, struct ksignal *ksig,
 		force_valid_ss(regs);
 
 	return 0;
+
+Efault:
+	user_access_end();
+	return -EFAULT;
 }
 #endif /* CONFIG_X86_32 */
 
@@ -539,44 +519,33 @@ static int x32_setup_rt_frame(struct ksignal *ksig,
 	struct rt_sigframe_x32 __user *frame;
 	unsigned long uc_flags;
 	void __user *restorer;
-	int err = 0;
-	void __user *fpstate = NULL;
-
-	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
+	void __user *fp = NULL;
 
-	if (!access_ok(frame, sizeof(*frame)))
+	if (!(ksig->ka.sa.sa_flags & SA_RESTORER))
 		return -EFAULT;
 
-	if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
-		if (__copy_siginfo_to_user32(&frame->info, &ksig->info, true))
-			return -EFAULT;
-	}
+	frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fp);
 
 	uc_flags = frame_uc_flags(regs);
 
-	put_user_try {
-		/* Create the ucontext.  */
-		put_user_ex(uc_flags, &frame->uc.uc_flags);
-		put_user_ex(0, &frame->uc.uc_link);
-		compat_save_altstack_ex(&frame->uc.uc_stack, regs->sp);
-		put_user_ex(0, &frame->uc.uc__pad0);
-
-		if (ksig->ka.sa.sa_flags & SA_RESTORER) {
-			restorer = ksig->ka.sa.sa_restorer;
-		} else {
-			/* could use a vstub here */
-			restorer = NULL;
-			err |= -EFAULT;
-		}
-		put_user_ex(restorer, (unsigned long __user *)&frame->pretcode);
-	} put_user_catch(err);
+	if (!user_access_begin(frame, sizeof(*frame)))
+		return -EFAULT;
 
-	err |= setup_sigcontext(&frame->uc.uc_mcontext, fpstate,
-				regs, set->sig[0]);
-	err |= __copy_to_user(&frame->uc.uc_sigmask, set, sizeof(*set));
+	/* Create the ucontext.  */
+	unsafe_put_user(uc_flags, &frame->uc.uc_flags, Efault);
+	unsafe_put_user(0, &frame->uc.uc_link, Efault);
+	unsafe_compat_save_altstack(&frame->uc.uc_stack, regs->sp, Efault);
+	unsafe_put_user(0, &frame->uc.uc__pad0, Efault);
+	restorer = ksig->ka.sa.sa_restorer;
+	unsafe_put_user(restorer, (unsigned long __user *)&frame->pretcode, Efault);
+	unsafe_put_sigcontext(&frame->uc.uc_mcontext, fp, regs, set, Efault);
+	unsafe_put_sigmask(set, frame, Efault);
+	user_access_end();
 
-	if (err)
-		return -EFAULT;
+	if (ksig->ka.sa.sa_flags & SA_SIGINFO) {
+		if (__copy_siginfo_to_user32(&frame->info, &ksig->info, true))
+			return -EFAULT;
+	}
 
 	/* Set up registers for signal handler */
 	regs->sp = (unsigned long) frame;
@@ -595,6 +564,11 @@ static int x32_setup_rt_frame(struct ksignal *ksig,
 #endif	/* CONFIG_X86_X32_ABI */
 
 	return 0;
+#ifdef CONFIG_X86_X32_ABI
+Efault:
+	user_access_end();
+	return -EFAULT;
+#endif
 }
 
 /*
@@ -611,9 +585,8 @@ SYSCALL_DEFINE0(sigreturn)
 
 	if (!access_ok(frame, sizeof(*frame)))
 		goto badframe;
-	if (__get_user(set.sig[0], &frame->sc.oldmask) || (_NSIG_WORDS > 1
-		&& __copy_from_user(&set.sig[1], &frame->extramask,
-				    sizeof(frame->extramask))))
+	if (__get_user(set.sig[0], &frame->sc.oldmask) ||
+	    __get_user(set.sig[1], &frame->extramask[0]))
 		goto badframe;
 
 	set_current_blocked(&set);
@@ -643,7 +616,7 @@ SYSCALL_DEFINE0(rt_sigreturn)
 	frame = (struct rt_sigframe __user *)(regs->sp - sizeof(long));
 	if (!access_ok(frame, sizeof(*frame)))
 		goto badframe;
-	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+	if (__get_user(*(__u64 *)&set, (__u64 __user *)&frame->uc.uc_sigmask))
 		goto badframe;
 	if (__get_user(uc_flags, &frame->uc.uc_flags))
 		goto badframe;
@@ -868,7 +841,7 @@ COMPAT_SYSCALL_DEFINE0(x32_rt_sigreturn)
 
 	if (!access_ok(frame, sizeof(*frame)))
 		goto badframe;
-	if (__copy_from_user(&set, &frame->uc.uc_sigmask, sizeof(set)))
+	if (__get_user(set.sig[0], (__u64 __user *)&frame->uc.uc_sigmask))
 		goto badframe;
 	if (__get_user(uc_flags, &frame->uc.uc_flags))
 		goto badframe;
diff --git a/arch/x86/kernel/smpboot.c b/arch/x86/kernel/smpboot.c
index d59525d2ead3..fe3ab9632f3b 100644
--- a/arch/x86/kernel/smpboot.c
+++ b/arch/x86/kernel/smpboot.c
@@ -1438,7 +1438,7 @@ early_param("possible_cpus", _setup_possible_cpus);
 /*
  * cpu_possible_mask should be static, it cannot change as cpu's
  * are onlined, or offlined. The reason is per-cpu data-structures
- * are allocated by some modules at init time, and dont expect to
+ * are allocated by some modules at init time, and don't expect to
  * do this dynamically on cpu arrival/departure.
  * cpu_present_mask on the other hand can change dynamically.
  * In case when cpu_hotplug is not compiled, then we resort to current
diff --git a/arch/x86/kernel/stacktrace.c b/arch/x86/kernel/stacktrace.c
index 2d6898c2cb64..6ad43fc44556 100644
--- a/arch/x86/kernel/stacktrace.c
+++ b/arch/x86/kernel/stacktrace.c
@@ -96,7 +96,8 @@ struct stack_frame_user {
 };
 
 static int
-copy_stack_frame(const void __user *fp, struct stack_frame_user *frame)
+copy_stack_frame(const struct stack_frame_user __user *fp,
+		 struct stack_frame_user *frame)
 {
 	int ret;
 
@@ -105,7 +106,8 @@ copy_stack_frame(const void __user *fp, struct stack_frame_user *frame)
 
 	ret = 1;
 	pagefault_disable();
-	if (__copy_from_user_inatomic(frame, fp, sizeof(*frame)))
+	if (__get_user(frame->next_fp, &fp->next_fp) ||
+	    __get_user(frame->ret_addr, &fp->ret_addr))
 		ret = 0;
 	pagefault_enable();
 
diff --git a/arch/x86/kernel/time.c b/arch/x86/kernel/time.c
index 4d545db52efc..106e7f87f534 100644
--- a/arch/x86/kernel/time.c
+++ b/arch/x86/kernel/time.c
@@ -62,19 +62,16 @@ static irqreturn_t timer_interrupt(int irq, void *dev_id)
 	return IRQ_HANDLED;
 }
 
-static struct irqaction irq0  = {
-	.handler = timer_interrupt,
-	.flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER,
-	.name = "timer"
-};
-
 static void __init setup_default_timer_irq(void)
 {
+	unsigned long flags = IRQF_NOBALANCING | IRQF_IRQPOLL | IRQF_TIMER;
+
 	/*
-	 * Unconditionally register the legacy timer; even without legacy
-	 * PIC/PIT we need this for the HPET0 in legacy replacement mode.
+	 * Unconditionally register the legacy timer interrupt; even
+	 * without legacy PIC/PIT we need this for the HPET0 in legacy
+	 * replacement mode.
 	 */
-	if (setup_irq(0, &irq0))
+	if (request_irq(0, timer_interrupt, flags, "timer", NULL))
 		pr_info("Failed to register legacy timer interrupt\n");
 }
 
diff --git a/arch/x86/kernel/tsc.c b/arch/x86/kernel/tsc.c
index 971d6f0216df..fdd4c1078632 100644
--- a/arch/x86/kernel/tsc.c
+++ b/arch/x86/kernel/tsc.c
@@ -477,7 +477,7 @@ static unsigned long pit_calibrate_tsc(u32 latch, unsigned long ms, int loopmin)
  * transition from one expected value to another with a fairly
  * high accuracy, and we didn't miss any events. We can thus
  * use the TSC value at the transitions to calculate a pretty
- * good value for the TSC frequencty.
+ * good value for the TSC frequency.
  */
 static inline int pit_verify_msb(unsigned char val)
 {
diff --git a/arch/x86/kernel/tsc_sync.c b/arch/x86/kernel/tsc_sync.c
index 32a818764e03..3d3c761eb74a 100644
--- a/arch/x86/kernel/tsc_sync.c
+++ b/arch/x86/kernel/tsc_sync.c
@@ -295,7 +295,7 @@ static cycles_t check_tsc_warp(unsigned int timeout)
  * But as the TSC is per-logical CPU and can potentially be modified wrongly
  * by the bios, TSC sync test for smaller duration should be able
  * to catch such errors. Also this will catch the condition where all the
- * cores in the socket doesn't get reset at the same time.
+ * cores in the socket don't get reset at the same time.
  */
 static inline unsigned int loop_timeout(int cpu)
 {
diff --git a/arch/x86/kernel/vm86_32.c b/arch/x86/kernel/vm86_32.c
index 91d55454e702..47a8676c7395 100644
--- a/arch/x86/kernel/vm86_32.c
+++ b/arch/x86/kernel/vm86_32.c
@@ -98,7 +98,6 @@ void save_v86_state(struct kernel_vm86_regs *regs, int retval)
 	struct task_struct *tsk = current;
 	struct vm86plus_struct __user *user;
 	struct vm86 *vm86 = current->thread.vm86;
-	long err = 0;
 
 	/*
 	 * This gets called from entry.S with interrupts disabled, but
@@ -114,37 +113,30 @@ void save_v86_state(struct kernel_vm86_regs *regs, int retval)
 	set_flags(regs->pt.flags, VEFLAGS, X86_EFLAGS_VIF | vm86->veflags_mask);
 	user = vm86->user_vm86;
 
-	if (!access_ok(user, vm86->vm86plus.is_vm86pus ?
+	if (!user_access_begin(user, vm86->vm86plus.is_vm86pus ?
 		       sizeof(struct vm86plus_struct) :
-		       sizeof(struct vm86_struct))) {
-		pr_alert("could not access userspace vm86 info\n");
-		do_exit(SIGSEGV);
-	}
-
-	put_user_try {
-		put_user_ex(regs->pt.bx, &user->regs.ebx);
-		put_user_ex(regs->pt.cx, &user->regs.ecx);
-		put_user_ex(regs->pt.dx, &user->regs.edx);
-		put_user_ex(regs->pt.si, &user->regs.esi);
-		put_user_ex(regs->pt.di, &user->regs.edi);
-		put_user_ex(regs->pt.bp, &user->regs.ebp);
-		put_user_ex(regs->pt.ax, &user->regs.eax);
-		put_user_ex(regs->pt.ip, &user->regs.eip);
-		put_user_ex(regs->pt.cs, &user->regs.cs);
-		put_user_ex(regs->pt.flags, &user->regs.eflags);
-		put_user_ex(regs->pt.sp, &user->regs.esp);
-		put_user_ex(regs->pt.ss, &user->regs.ss);
-		put_user_ex(regs->es, &user->regs.es);
-		put_user_ex(regs->ds, &user->regs.ds);
-		put_user_ex(regs->fs, &user->regs.fs);
-		put_user_ex(regs->gs, &user->regs.gs);
-
-		put_user_ex(vm86->screen_bitmap, &user->screen_bitmap);
-	} put_user_catch(err);
-	if (err) {
-		pr_alert("could not access userspace vm86 info\n");
-		do_exit(SIGSEGV);
-	}
+		       sizeof(struct vm86_struct)))
+		goto Efault;
+
+	unsafe_put_user(regs->pt.bx, &user->regs.ebx, Efault_end);
+	unsafe_put_user(regs->pt.cx, &user->regs.ecx, Efault_end);
+	unsafe_put_user(regs->pt.dx, &user->regs.edx, Efault_end);
+	unsafe_put_user(regs->pt.si, &user->regs.esi, Efault_end);
+	unsafe_put_user(regs->pt.di, &user->regs.edi, Efault_end);
+	unsafe_put_user(regs->pt.bp, &user->regs.ebp, Efault_end);
+	unsafe_put_user(regs->pt.ax, &user->regs.eax, Efault_end);
+	unsafe_put_user(regs->pt.ip, &user->regs.eip, Efault_end);
+	unsafe_put_user(regs->pt.cs, &user->regs.cs, Efault_end);
+	unsafe_put_user(regs->pt.flags, &user->regs.eflags, Efault_end);
+	unsafe_put_user(regs->pt.sp, &user->regs.esp, Efault_end);
+	unsafe_put_user(regs->pt.ss, &user->regs.ss, Efault_end);
+	unsafe_put_user(regs->es, &user->regs.es, Efault_end);
+	unsafe_put_user(regs->ds, &user->regs.ds, Efault_end);
+	unsafe_put_user(regs->fs, &user->regs.fs, Efault_end);
+	unsafe_put_user(regs->gs, &user->regs.gs, Efault_end);
+	unsafe_put_user(vm86->screen_bitmap, &user->screen_bitmap, Efault_end);
+
+	user_access_end();
 
 	preempt_disable();
 	tsk->thread.sp0 = vm86->saved_sp0;
@@ -159,6 +151,13 @@ void save_v86_state(struct kernel_vm86_regs *regs, int retval)
 	lazy_load_gs(vm86->regs32.gs);
 
 	regs->pt.ax = retval;
+	return;
+
+Efault_end:
+	user_access_end();
+Efault:
+	pr_alert("could not access userspace vm86 info\n");
+	do_exit(SIGSEGV);
 }
 
 static void mark_screen_rdonly(struct mm_struct *mm)
@@ -243,6 +242,7 @@ static long do_sys_vm86(struct vm86plus_struct __user *user_vm86, bool plus)
 	struct kernel_vm86_regs vm86regs;
 	struct pt_regs *regs = current_pt_regs();
 	unsigned long err = 0;
+	struct vm86_struct v;
 
 	err = security_mmap_addr(0);
 	if (err) {
@@ -278,39 +278,32 @@ static long do_sys_vm86(struct vm86plus_struct __user *user_vm86, bool plus)
 	if (vm86->saved_sp0)
 		return -EPERM;
 
-	if (!access_ok(user_vm86, plus ?
-		       sizeof(struct vm86_struct) :
-		       sizeof(struct vm86plus_struct)))
+	if (copy_from_user(&v, user_vm86,
+			offsetof(struct vm86_struct, int_revectored)))
 		return -EFAULT;
 
 	memset(&vm86regs, 0, sizeof(vm86regs));
-	get_user_try {
-		unsigned short seg;
-		get_user_ex(vm86regs.pt.bx, &user_vm86->regs.ebx);
-		get_user_ex(vm86regs.pt.cx, &user_vm86->regs.ecx);
-		get_user_ex(vm86regs.pt.dx, &user_vm86->regs.edx);
-		get_user_ex(vm86regs.pt.si, &user_vm86->regs.esi);
-		get_user_ex(vm86regs.pt.di, &user_vm86->regs.edi);
-		get_user_ex(vm86regs.pt.bp, &user_vm86->regs.ebp);
-		get_user_ex(vm86regs.pt.ax, &user_vm86->regs.eax);
-		get_user_ex(vm86regs.pt.ip, &user_vm86->regs.eip);
-		get_user_ex(seg, &user_vm86->regs.cs);
-		vm86regs.pt.cs = seg;
-		get_user_ex(vm86regs.pt.flags, &user_vm86->regs.eflags);
-		get_user_ex(vm86regs.pt.sp, &user_vm86->regs.esp);
-		get_user_ex(seg, &user_vm86->regs.ss);
-		vm86regs.pt.ss = seg;
-		get_user_ex(vm86regs.es, &user_vm86->regs.es);
-		get_user_ex(vm86regs.ds, &user_vm86->regs.ds);
-		get_user_ex(vm86regs.fs, &user_vm86->regs.fs);
-		get_user_ex(vm86regs.gs, &user_vm86->regs.gs);
-
-		get_user_ex(vm86->flags, &user_vm86->flags);
-		get_user_ex(vm86->screen_bitmap, &user_vm86->screen_bitmap);
-		get_user_ex(vm86->cpu_type, &user_vm86->cpu_type);
-	} get_user_catch(err);
-	if (err)
-		return err;
+
+	vm86regs.pt.bx = v.regs.ebx;
+	vm86regs.pt.cx = v.regs.ecx;
+	vm86regs.pt.dx = v.regs.edx;
+	vm86regs.pt.si = v.regs.esi;
+	vm86regs.pt.di = v.regs.edi;
+	vm86regs.pt.bp = v.regs.ebp;
+	vm86regs.pt.ax = v.regs.eax;
+	vm86regs.pt.ip = v.regs.eip;
+	vm86regs.pt.cs = v.regs.cs;
+	vm86regs.pt.flags = v.regs.eflags;
+	vm86regs.pt.sp = v.regs.esp;
+	vm86regs.pt.ss = v.regs.ss;
+	vm86regs.es = v.regs.es;
+	vm86regs.ds = v.regs.ds;
+	vm86regs.fs = v.regs.fs;
+	vm86regs.gs = v.regs.gs;
+
+	vm86->flags = v.flags;
+	vm86->screen_bitmap = v.screen_bitmap;
+	vm86->cpu_type = v.cpu_type;
 
 	if (copy_from_user(&vm86->int_revectored,
 			   &user_vm86->int_revectored,