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x86: cleanup stack protector

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Impact: cleanup

Make the following cleanups.

* remove duplicate comment from boot_init_stack_canary() which fits
  better in the other place - cpu_idle().

* move stack_canary offset check from __switch_to() to
  boot_init_stack_canary().

Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Tejun Heo
2009-01-20 12:29:19 +09:00
parent 7890ba8c87
commit c6e50f93db
3 changed files with 6 additions and 16 deletions
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7
arch/x86/kernel/process_64.c
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@ -638,13 +638,6 @@ __switch_to(struct task_struct *prev_p, struct task_struct *next_p)
percpu_write(kernel_stack,
(unsigned long)task_stack_page(next_p) +
THREAD_SIZE - KERNEL_STACK_OFFSET);
#ifdef CONFIG_CC_STACKPROTECTOR
/*
* 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);
#endif
/*
* Now maybe reload the debug registers and handle I/O bitmaps