linux-kernel - [PATCH v4 03/10] x86: processor.h: Introduce macros to initialize IO fields of thread and TSS

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Date:	Sun, 2 Nov 2014 09:32:14 -0800
From:	Josh Triplett <josh@...htriplett.org>
To:	"H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
	Kees Cook <keescook@...omium.org>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-kernel@...r.kernel.org,
	virtualization@...ts.linux-foundation.org, x86@...nel.org,
	xen-devel@...ts.xenproject.org
Subject: [PATCH v4 03/10] x86: processor.h: Introduce macros to initialize IO
 fields of thread and TSS

No functional change, just splitting out parts of the existing
INIT_THREAD and INIT_TSS macros.  This will simplify making those fields
optional later.

Signed-off-by: Josh Triplett <josh@...htriplett.org>
---
 arch/x86/include/asm/processor.h | 18 +++++++++++-------
 1 file changed, 11 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 76751cd..0a12534 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -842,12 +842,7 @@ static inline void spin_lock_prefetch(const void *x)
 #define STACK_TOP		TASK_SIZE
 #define STACK_TOP_MAX		STACK_TOP
 
-#define INIT_THREAD  {							  \
-	.sp0			= sizeof(init_stack) + (long)&init_stack, \
-	.vm86_info		= NULL,					  \
-	.sysenter_cs		= __KERNEL_CS,				  \
-	.io_bitmap_ptr		= NULL,					  \
-}
+#define INIT_THREAD_IO .io_bitmap_ptr = NULL,
 
 /*
  * Note that the .io_bitmap member must be extra-big. This is because
@@ -855,6 +850,15 @@ static inline void spin_lock_prefetch(const void *x)
  * permission bitmap. The extra byte must be all 1 bits, and must
  * be within the limit.
  */
+#define INIT_TSS_IO .io_bitmap = { [0 ... IO_BITMAP_LONGS] = ~0 },
+
+#define INIT_THREAD  {							  \
+	.sp0			= sizeof(init_stack) + (long)&init_stack, \
+	.vm86_info		= NULL,					  \
+	.sysenter_cs		= __KERNEL_CS,				  \
+	INIT_THREAD_IO							  \
+}
+
 #define INIT_TSS  {							  \
 	.x86_tss = {							  \
 		.sp0		= sizeof(init_stack) + (long)&init_stack, \
@@ -862,7 +866,7 @@ static inline void spin_lock_prefetch(const void *x)
 		.ss1		= __KERNEL_CS,				  \
 		.io_bitmap_base	= INVALID_IO_BITMAP_OFFSET,		  \
 	 },								  \
-	.io_bitmap		= { [0 ... IO_BITMAP_LONGS] = ~0 },	  \
+	INIT_TSS_IO							  \
 }
 
 extern unsigned long thread_saved_pc(struct task_struct *tsk);
-- 
2.1.1

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