locking, arch/ia64: Reduce <asm/smp.h> header dependencies by moving XTP bits into the new <asm/xtp.h> header

We want to remove the #include <asm/io.h> from <asm/smp.h>, but for this
we have to move the XTP bits into a separate header first (as these bits
rely on <asm/io.h> definitions), and include them in the .c files that rely
on those APIs.

Co-developed-by: Ingo Molnar <mingo@kernel.org>
Signed-off-by: Peter Zijlstra <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>

8 files changed, 52 insertions, 35 deletions

diff --git a/arch/ia64/include/asm/smp.h b/arch/ia64/include/asm/smp.h
index 7847ae40a181..aa92234c0142 100644
--- a/arch/ia64/include/asm/smp.h
+++ b/arch/ia64/include/asm/smp.h
@@ -18,7 +18,6 @@
 #include <linux/bitops.h>
 #include <linux/irqreturn.h>
 
-#include <asm/io.h>
 #include <asm/param.h>
 #include <asm/processor.h>
 #include <asm/ptrace.h>
@@ -44,11 +43,6 @@ ia64_get_lid (void)
 
 #ifdef CONFIG_SMP
 
-#define XTP_OFFSET		0x1e0008
-
-#define SMP_IRQ_REDIRECTION	(1 << 0)
-#define SMP_IPI_REDIRECTION	(1 << 1)
-
 #define raw_smp_processor_id() (current_thread_info()->cpu)
 
 extern struct smp_boot_data {
@@ -62,7 +56,6 @@ extern cpumask_t cpu_core_map[NR_CPUS];
 DECLARE_PER_CPU_SHARED_ALIGNED(cpumask_t, cpu_sibling_map);
 extern int smp_num_siblings;
 extern void __iomem *ipi_base_addr;
-extern unsigned char smp_int_redirect;
 
 extern volatile int ia64_cpu_to_sapicid[];
 #define cpu_physical_id(i)	ia64_cpu_to_sapicid[i]
@@ -84,34 +77,6 @@ cpu_logical_id (int cpuid)
 	return i;
 }
 
-/*
- * XTP control functions:
- *	min_xtp   : route all interrupts to this CPU
- *	normal_xtp: nominal XTP value
- *	max_xtp   : never deliver interrupts to this CPU.
- */
-
-static inline void
-min_xtp (void)
-{
-	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
-		writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
-}
-
-static inline void
-normal_xtp (void)
-{
-	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
-		writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
-}
-
-static inline void
-max_xtp (void)
-{
-	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
-		writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
-}
-
 /* Upping and downing of CPUs */
 extern int __cpu_disable (void);
 extern void __cpu_die (unsigned int cpu);
diff --git a/arch/ia64/include/asm/xtp.h b/arch/ia64/include/asm/xtp.h
new file mode 100644
index 000000000000..5bf1d70ad860
--- /dev/null
+++ b/arch/ia64/include/asm/xtp.h
@@ -0,0 +1,46 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _ASM_IA64_XTP_H
+#define _ASM_IA64_XTP_H
+
+#include <asm/io.h>
+
+#ifdef CONFIG_SMP
+
+#define XTP_OFFSET		0x1e0008
+
+#define SMP_IRQ_REDIRECTION	(1 << 0)
+#define SMP_IPI_REDIRECTION	(1 << 1)
+
+extern unsigned char smp_int_redirect;
+
+/*
+ * XTP control functions:
+ *	min_xtp   : route all interrupts to this CPU
+ *	normal_xtp: nominal XTP value
+ *	max_xtp   : never deliver interrupts to this CPU.
+ */
+
+static inline void
+min_xtp (void)
+{
+	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
+		writeb(0x00, ipi_base_addr + XTP_OFFSET); /* XTP to min */
+}
+
+static inline void
+normal_xtp (void)
+{
+	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
+		writeb(0x08, ipi_base_addr + XTP_OFFSET); /* XTP normal */
+}
+
+static inline void
+max_xtp (void)
+{
+	if (smp_int_redirect & SMP_IRQ_REDIRECTION)
+		writeb(0x0f, ipi_base_addr + XTP_OFFSET); /* Set XTP to max */
+}
+
+#endif /* CONFIG_SMP */
+
+#endif /* _ASM_IA64_XTP_Hy */
diff --git a/arch/ia64/kernel/iosapic.c b/arch/ia64/kernel/iosapic.c
index fad4db20ce65..35adcf89035a 100644
--- a/arch/ia64/kernel/iosapic.c
+++ b/arch/ia64/kernel/iosapic.c
@@ -95,6 +95,7 @@
 #include <asm/iosapic.h>
 #include <asm/processor.h>
 #include <asm/ptrace.h>
+#include <asm/xtp.h>
 
 #undef DEBUG_INTERRUPT_ROUTING
 
diff --git a/arch/ia64/kernel/irq.c b/arch/ia64/kernel/irq.c
index 0a8e5e585edc..ecef17c7c35b 100644
--- a/arch/ia64/kernel/irq.c
+++ b/arch/ia64/kernel/irq.c
@@ -25,6 +25,7 @@
 #include <linux/kernel_stat.h>
 
 #include <asm/mca.h>
+#include <asm/xtp.h>
 
 /*
  * 'what should we do if we get a hw irq event on an illegal vector'.
diff --git a/arch/ia64/kernel/process.c b/arch/ia64/kernel/process.c
index 96dfb9e4b16f..4562a1aed454 100644
--- a/arch/ia64/kernel/process.c
+++ b/arch/ia64/kernel/process.c
@@ -48,6 +48,7 @@
 #include <linux/uaccess.h>
 #include <asm/unwind.h>
 #include <asm/user.h>
+#include <asm/xtp.h>
 
 #include "entry.h"
 
diff --git a/arch/ia64/kernel/sal.c b/arch/ia64/kernel/sal.c
index c455ece977ad..e4f0705c0282 100644
--- a/arch/ia64/kernel/sal.c
+++ b/arch/ia64/kernel/sal.c
@@ -18,6 +18,7 @@
 #include <asm/page.h>
 #include <asm/sal.h>
 #include <asm/pal.h>
+#include <asm/xtp.h>
 
  __cacheline_aligned DEFINE_SPINLOCK(sal_lock);
 unsigned long sal_platform_features;
diff --git a/arch/ia64/kernel/setup.c b/arch/ia64/kernel/setup.c
index d2d440fe855b..dd595fbd8006 100644
--- a/arch/ia64/kernel/setup.c
+++ b/arch/ia64/kernel/setup.c
@@ -65,6 +65,7 @@
 #include <asm/tlbflush.h>
 #include <asm/unistd.h>
 #include <asm/uv/uv.h>
+#include <asm/xtp.h>
 
 #if defined(CONFIG_SMP) && (IA64_CPU_SIZE > PAGE_SIZE)
 # error "struct cpuinfo_ia64 too big!"
diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c
index bbfd421e6deb..1cf7b9b3c1e2 100644
--- a/arch/ia64/kernel/smp.c
+++ b/arch/ia64/kernel/smp.c
@@ -46,6 +46,7 @@
 #include <asm/tlbflush.h>
 #include <asm/unistd.h>
 #include <asm/mca.h>
+#include <asm/xtp.h>
 
 /*
  * Note: alignment of 4 entries/cacheline was empirically determined