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authorBrian Gerst <brgerst@gmail.com>2009-01-19 12:21:28 +0900
committerTejun Heo <tj@kernel.org>2009-01-20 12:29:20 +0900
commit947e76cdc34c782fc947313d4331380686eebbad (patch)
treede5d424c4760269fd7800bc745e48b060c725300 /arch/x86/include/asm/stackprotector.h
parent8c7e58e690ae60ab4215b025f433ed4af261e103 (diff)
x86: move stack_canary into irq_stack
Impact: x86_64 percpu area layout change, irq_stack now at the beginning Now that the PDA is empty except for the stack canary, it can be removed. The irqstack is moved to the start of the per-cpu section. If the stack protector is enabled, the canary overlaps the bottom 48 bytes of the irqstack. tj: * updated subject * dropped asm relocation of irq_stack_ptr * updated comments a bit * rebased on top of stack canary changes Signed-off-by: Brian Gerst <brgerst@gmail.com> Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'arch/x86/include/asm/stackprotector.h')
-rw-r--r--arch/x86/include/asm/stackprotector.h6
1 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/include/asm/stackprotector.h b/arch/x86/include/asm/stackprotector.h
index 2383e5bb475..36a700acaf2 100644
--- a/arch/x86/include/asm/stackprotector.h
+++ b/arch/x86/include/asm/stackprotector.h
@@ -2,7 +2,7 @@
#define _ASM_STACKPROTECTOR_H 1
#include <asm/tsc.h>
-#include <asm/pda.h>
+#include <asm/processor.h>
/*
* Initialize the stackprotector canary value.
@@ -19,7 +19,7 @@ static __always_inline void boot_init_stack_canary(void)
* Build time only check to make sure the stack_canary is at
* offset 40 in the pda; this is a gcc ABI requirement
*/
- BUILD_BUG_ON(offsetof(struct x8664_pda, stack_canary) != 40);
+ BUILD_BUG_ON(offsetof(union irq_stack_union, stack_canary) != 40);
/*
* We both use the random pool and the current TSC as a source
@@ -32,7 +32,7 @@ static __always_inline void boot_init_stack_canary(void)
canary += tsc + (tsc << 32UL);
current->stack_canary = canary;
- write_pda(stack_canary, canary);
+ percpu_write(irq_stack_union.stack_canary, canary);
}
#endif