linux-kernel - [tip: x86/cleanups] x86/head_64: Use TESTB instead of TESTL in secondary_startup_64_no

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Date:   Wed, 13 Dec 2023 13:00:01 -0000
From:   "tip-bot2 for Uros Bizjak" <tip-bot2@...utronix.de>
To:     linux-tip-commits@...r.kernel.org
Cc:     Uros Bizjak <ubizjak@...il.com>,
        "Borislav Petkov (AMD)" <bp@...en8.de>, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: [tip: x86/cleanups] x86/head_64: Use TESTB instead of TESTL in
 secondary_startup_64_no_verify()

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

Commit-ID:     7d28365a06af74cee015a448d32ab6e98cd05cfb
Gitweb:        https://git.kernel.org/tip/7d28365a06af74cee015a448d32ab6e98cd05cfb
Author:        Uros Bizjak <ubizjak@...il.com>
AuthorDate:    Thu, 09 Nov 2023 21:09:56 +01:00
Committer:     Borislav Petkov (AMD) <bp@...en8.de>
CommitterDate: Wed, 13 Dec 2023 13:35:38 +01:00

x86/head_64: Use TESTB instead of TESTL in secondary_startup_64_no_verify()

There is no need to use TESTL when checking the least-significant bit
with a TEST instruction. Use TESTB, which is three bytes shorter:

   f6 05 00 00 00 00 01    testb  $0x1,0x0(%rip)

vs:

   f7 05 00 00 00 00 01    testl  $0x1,0x0(%rip)
   00 00 00

for the same effect.

No functional changes intended.

Signed-off-by: Uros Bizjak <ubizjak@...il.com>
Signed-off-by: Borislav Petkov (AMD) <bp@...en8.de>
Link: https://lore.kernel.org/r/20231109201032.4439-1-ubizjak@gmail.com
---
 arch/x86/kernel/head_64.S | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/kernel/head_64.S b/arch/x86/kernel/head_64.S
index 086a2c3..1f79d80 100644
--- a/arch/x86/kernel/head_64.S
+++ b/arch/x86/kernel/head_64.S
@@ -182,7 +182,7 @@ SYM_INNER_LABEL(secondary_startup_64_no_verify, SYM_L_GLOBAL)
 	/* Enable PAE mode, PSE, PGE and LA57 */
 	orl	$(X86_CR4_PAE | X86_CR4_PSE | X86_CR4_PGE), %ecx
 #ifdef CONFIG_X86_5LEVEL
-	testl	$1, __pgtable_l5_enabled(%rip)
+	testb	$1, __pgtable_l5_enabled(%rip)
 	jz	1f
 	orl	$X86_CR4_LA57, %ecx
 1: