linux-kernel - [tip: x86/core] x86/alternative: Simplify int3_selftest

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Date:   Wed, 09 Mar 2022 07:54:56 -0000
From:   "tip-bot2 for Peter Zijlstra" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Josh Poimboeuf <jpoimboe@...hat.com>,
        "Peter Zijlstra (Intel)" <peterz@...radead.org>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/core] x86/alternative: Simplify int3_selftest_ip

The following commit has been merged into the x86/core branch of tip:

Commit-ID:     8cdcaee61f7fe2d35ad8c3b3295ac7bd30244c7f
Gitweb:        https://git.kernel.org/tip/8cdcaee61f7fe2d35ad8c3b3295ac7bd30244c7f
Author:        Peter Zijlstra <peterz@...radead.org>
AuthorDate:    Tue, 08 Mar 2022 16:30:37 +01:00
Committer:     Peter Zijlstra <peterz@...radead.org>
CommitterDate: Tue, 08 Mar 2022 23:53:34 +01:00

x86/alternative: Simplify int3_selftest_ip

Similar to ibt_selftest_ip, apply the same pattern.

Suggested-by: Josh Poimboeuf <jpoimboe@...hat.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@...radead.org>
Acked-by: Josh Poimboeuf <jpoimboe@...hat.com>
Link: https://lore.kernel.org/r/20220308154318.700456643@infradead.org
---
 arch/x86/kernel/alternative.c | 13 +++----------
 1 file changed, 3 insertions(+), 10 deletions(-)

diff --git a/arch/x86/kernel/alternative.c b/arch/x86/kernel/alternative.c
index 5007c3f..de56b5c 100644
--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -719,7 +719,7 @@ asm (
 "	.popsection\n"
 );
 
-extern __initdata unsigned long int3_selftest_ip; /* defined in asm below */
+extern void int3_selftest_ip(void); /* defined in asm below */
 
 static int __init
 int3_exception_notify(struct notifier_block *self, unsigned long val, void *data)
@@ -733,7 +733,7 @@ int3_exception_notify(struct notifier_block *self, unsigned long val, void *data
 	if (val != DIE_INT3)
 		return NOTIFY_DONE;
 
-	if (regs->ip - INT3_INSN_SIZE != int3_selftest_ip)
+	if (regs->ip - INT3_INSN_SIZE != (unsigned long)&int3_selftest_ip)
 		return NOTIFY_DONE;
 
 	int3_emulate_call(regs, (unsigned long)&int3_magic);
@@ -757,14 +757,7 @@ static void __init int3_selftest(void)
 	 * then trigger the INT3, padded with NOPs to match a CALL instruction
 	 * length.
 	 */
-	asm volatile ("1: int3; nop; nop; nop; nop\n\t"
-		      ".pushsection .init.data,\"aw\"\n\t"
-		      ".align " __ASM_SEL(4, 8) "\n\t"
-		      ".type int3_selftest_ip, @object\n\t"
-		      ".size int3_selftest_ip, " __ASM_SEL(4, 8) "\n\t"
-		      "int3_selftest_ip:\n\t"
-		      __ASM_SEL(.long, .quad) " 1b\n\t"
-		      ".popsection\n\t"
+	asm volatile ("int3_selftest_ip: int3; nop; nop; nop; nop\n\t"
 		      : ASM_CALL_CONSTRAINT
 		      : __ASM_SEL_RAW(a, D) (&val)
 		      : "memory");