x86/alternatives: Update int3_emulate_push() comment

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>

diff --git a/arch/x86/include/asm/text-patching.h b/arch/x86/include/asm/text-patching.h
index 23c626a742e87982f321865adad9d64706f727d5..ea91049058d81d72270a26328618cf3ba3b6407b 100644 (file)
--- a/arch/x86/include/asm/text-patching.h
+++ b/arch/x86/include/asm/text-patching.h
@@ -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;