diff options
Diffstat (limited to 'include/asm-generic')
-rw-r--r-- | include/asm-generic/Kbuild | 1 | ||||
-rw-r--r-- | include/asm-generic/bitsperlong.h | 4 | ||||
-rw-r--r-- | include/asm-generic/bug.h | 1 | ||||
-rw-r--r-- | include/asm-generic/pgtable.h | 22 | ||||
-rw-r--r-- | include/asm-generic/posix_types.h | 4 |
5 files changed, 26 insertions, 6 deletions
diff --git a/include/asm-generic/Kbuild b/include/asm-generic/Kbuild index 53f91b1ae53a..2c85a0f647b7 100644 --- a/include/asm-generic/Kbuild +++ b/include/asm-generic/Kbuild @@ -8,6 +8,7 @@ header-y += int-ll64.h header-y += ioctl.h header-y += ioctls.h header-y += ipcbuf.h +header-y += kvm_para.h header-y += mman-common.h header-y += mman.h header-y += msgbuf.h diff --git a/include/asm-generic/bitsperlong.h b/include/asm-generic/bitsperlong.h index 4ae54e07de83..a7b0914348fd 100644 --- a/include/asm-generic/bitsperlong.h +++ b/include/asm-generic/bitsperlong.h @@ -28,5 +28,9 @@ #error Inconsistent word size. Check asm/bitsperlong.h #endif +#ifndef BITS_PER_LONG_LONG +#define BITS_PER_LONG_LONG 64 +#endif + #endif /* __KERNEL__ */ #endif /* __ASM_GENERIC_BITS_PER_LONG */ diff --git a/include/asm-generic/bug.h b/include/asm-generic/bug.h index 2520a6e241dc..9f02005f217a 100644 --- a/include/asm-generic/bug.h +++ b/include/asm-generic/bug.h @@ -2,6 +2,7 @@ #define _ASM_GENERIC_BUG_H #include <linux/compiler.h> +#include <linux/kernel.h> #ifdef CONFIG_BUG diff --git a/include/asm-generic/pgtable.h b/include/asm-generic/pgtable.h index e2768f188f55..6f2b45a9b6bc 100644 --- a/include/asm-generic/pgtable.h +++ b/include/asm-generic/pgtable.h @@ -445,6 +445,18 @@ static inline int pmd_write(pmd_t pmd) #endif /* __HAVE_ARCH_PMD_WRITE */ #endif /* CONFIG_TRANSPARENT_HUGEPAGE */ +#ifndef pmd_read_atomic +static inline pmd_t pmd_read_atomic(pmd_t *pmdp) +{ + /* + * Depend on compiler for an atomic pmd read. NOTE: this is + * only going to work, if the pmdval_t isn't larger than + * an unsigned long. + */ + return *pmdp; +} +#endif + /* * This function is meant to be used by sites walking pagetables with * the mmap_sem hold in read mode to protect against MADV_DONTNEED and @@ -458,11 +470,17 @@ static inline int pmd_write(pmd_t pmd) * undefined so behaving like if the pmd was none is safe (because it * can return none anyway). The compiler level barrier() is critically * important to compute the two checks atomically on the same pmdval. + * + * For 32bit kernels with a 64bit large pmd_t this automatically takes + * care of reading the pmd atomically to avoid SMP race conditions + * against pmd_populate() when the mmap_sem is hold for reading by the + * caller (a special atomic read not done by "gcc" as in the generic + * version above, is also needed when THP is disabled because the page + * fault can populate the pmd from under us). */ static inline int pmd_none_or_trans_huge_or_clear_bad(pmd_t *pmd) { - /* depend on compiler for an atomic pmd read */ - pmd_t pmdval = *pmd; + pmd_t pmdval = pmd_read_atomic(pmd); /* * The barrier will stabilize the pmdval in a register or on * the stack so that it will stop changing under the code. diff --git a/include/asm-generic/posix_types.h b/include/asm-generic/posix_types.h index 91d44bd4dde3..fe74fccf18db 100644 --- a/include/asm-generic/posix_types.h +++ b/include/asm-generic/posix_types.h @@ -23,10 +23,6 @@ typedef __kernel_ulong_t __kernel_ino_t; typedef unsigned int __kernel_mode_t; #endif -#ifndef __kernel_nlink_t -typedef __kernel_ulong_t __kernel_nlink_t; -#endif - #ifndef __kernel_pid_t typedef int __kernel_pid_t; #endif |