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| author |   Uros Bizjak <ubizjak@gmail.com> | 2025-03-03 16:54:24 +0100 |
|---|---|---|
| committer |   Ingo Molnar <mingo@kernel.org> | 2025-03-04 20:28:58 +0100 |
| commit | d4432fb5b8798a7663974bed277a8a6e330a50d8 (patch) | |
| tree | 30d51087d2a98000197961734a6a81413b5c61ac | |
| parent | x86/irq/32: Add missing clobber to inline asm (diff) | |
| download | wireguard-linux-d4432fb5b8798a7663974bed277a8a6e330a50d8.tar.xz wireguard-linux-d4432fb5b8798a7663974bed277a8a6e330a50d8.zip | |
x86/irq/32: Use current_stack_pointer to avoid asm() in check_stack_overflow()
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
| -rw-r--r-- | arch/x86/kernel/irq_32.c | 5 |
1 files changed, 1 insertions, 4 deletions
diff --git a/arch/x86/kernel/irq_32.c b/arch/x86/kernel/irq_32.c index eab458009f97..8c7babbcf6b7 100644 --- a/arch/x86/kernel/irq_32.c +++ b/arch/x86/kernel/irq_32.c @@ -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); } |