linux-kernel - [PATCH 5.10 019/130] x86/alternative: Use insn

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Message-Id: <20220712183247.281867457@linuxfoundation.org>
Date:   Tue, 12 Jul 2022 20:37:45 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Borislav Petkov <bp@...e.de>,
        Ben Hutchings <ben@...adent.org.uk>
Subject: [PATCH 5.10 019/130] x86/alternative: Use insn_decode()

From: Borislav Petkov <bp@...e.de>

commit 63c66cde7bbcc79aac14b25861c5b2495eede57b upstream.

No functional changes, just simplification.

Signed-off-by: Borislav Petkov <bp@...e.de>
Link: https://lkml.kernel.org/r/20210304174237.31945-10-bp@alien8.de
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/kernel/alternative.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

--- a/arch/x86/kernel/alternative.c
+++ b/arch/x86/kernel/alternative.c
@@ -1284,15 +1284,15 @@ static void text_poke_loc_init(struct te
 			       const void *opcode, size_t len, const void *emulate)
 {
 	struct insn insn;
+	int ret;
 
 	memcpy((void *)tp->text, opcode, len);
 	if (!emulate)
 		emulate = opcode;
 
-	kernel_insn_init(&insn, emulate, MAX_INSN_SIZE);
-	insn_get_length(&insn);
+	ret = insn_decode(&insn, emulate, MAX_INSN_SIZE, INSN_MODE_KERN);
 
-	BUG_ON(!insn_complete(&insn));
+	BUG_ON(ret < 0);
 	BUG_ON(len != insn.length);
 
 	tp->rel_addr = addr - (void *)_stext;