[patch 1/5] -fstack-protector feature: annotate the PDA offsets

[Arjan van de Ven]

Subject: [patch 1/5] Add comments to the PDA structure to annotate offsets
From: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>

Change the comments in the pda structure to make the first fields to have
their offset documented and to have the comments aligned.
The stack protector series needs a field at offset 40 (gcc ABI); annotate
upto 40 for that reason.

Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Signed-off-by: Ingo Molnar <mingo@xxxxxxx>
CC: Andi Kleen <ak@xxxxxxx>
---
 include/asm-x86_64/pda.h |   14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

Index: linux-2.6.18-rc4-stackprot/include/asm-x86_64/pda.h
===================================================================
--- linux-2.6.18-rc4-stackprot.orig/include/asm-x86_64/pda.h
+++ linux-2.6.18-rc4-stackprot/include/asm-x86_64/pda.h
@@ -9,14 +9,12 @@
 
 /* Per processor datastructure. %gs points to it while the kernel runs */ 
 struct x8664_pda {
-	struct task_struct *pcurrent;	/* Current process */
-	unsigned long data_offset;	/* Per cpu data offset from linker address */
-	unsigned long kernelstack;  /* top of kernel stack for current */ 
-	unsigned long oldrsp; 	    /* user rsp for system call */
-#if DEBUG_STKSZ > EXCEPTION_STKSZ
-	unsigned long debugstack;   /* #DB/#BP stack. */
-#endif
-        int irqcount;		    /* Irq nesting counter. Starts with -1 */  	
+	struct task_struct *pcurrent;	/*  0 */  /* Current process */
+	unsigned long data_offset;	/*  8 */  /* Per cpu data offset from linker address */
+	unsigned long kernelstack;	/* 16 */  /* top of kernel stack for current */
+	unsigned long oldrsp;		/* 24 */  /* user rsp for system call */
+	unsigned long debugstack;	/* 32 */  /* #DB/#BP stack. */
+	int irqcount;			/* 40 */  /* Irq nesting counter. Starts with -1 */
 	int cpunumber;		    /* Logical CPU number */
 	char *irqstackptr;	/* top of irqstack */
 	int nodenumber;		    /* number of current node */

-
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