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x86/alternatives: Update int3_emulate_push() comment

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Update the comment now that we've merged x86_32 support.

Tested-by: Alexei Starovoitov <ast@kernel.org>
Tested-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Alexei Starovoitov <ast@kernel.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: https://lkml.kernel.org/r/20191111132457.588386013@infradead.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Peter Zijlstra 2019-09-03 13:43:24 +02:00 committed by Ingo Molnar
parent c2da5bdc66
commit 8f4a4160c6
1 changed files with 3 additions and 0 deletions
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3
arch/x86/include/asm/text-patching.h
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@ -85,6 +85,9 @@ static inline void int3_emulate_push(struct pt_regs *regs, unsigned long val)
* stack where the break point happened, and the saving of
* pt_regs. We can extend the original stack because of
* this gap. See the idtentry macro's create_gap option.
*
* Similarly entry_32.S will have a gap on the stack for (any) hardware
* exception and pt_regs; see FIXUP_FRAME.
*/
regs->sp -= sizeof(unsigned long);
*(unsigned long *)regs->sp = val;