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x86/irq/32: Use current_stack_pointer to avoid asm() in check_stack_overflow()

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Make code more readable by using the 'current_stack_pointer' global variable.

Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Link: https://lore.kernel.org/r/20250303155446.112769-4-ubizjak@gmail.com
This commit is contained in:
Uros Bizjak 2025-03-03 16:54:24 +01:00 committed by Ingo Molnar
parent 76f7113781
commit d4432fb5b8
1 changed files with 1 additions and 4 deletions
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5
arch/x86/kernel/irq_32.c
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@ -31,10 +31,7 @@ int sysctl_panic_on_stackoverflow __read_mostly;
/* Debugging check for stack overflow: is there less than 1KB free? */
static int check_stack_overflow(void)
{
long sp;
__asm__ __volatile__("andl %%esp,%0" :
"=r" (sp) : "0" (THREAD_SIZE - 1));
unsigned long sp = current_stack_pointer & (THREAD_SIZE - 1);
return sp < (sizeof(struct thread_info) + STACK_WARN);
}