From: Uros Bizjak <ubizjak@gmail.com>
To: linux-um@lists.infradead.org, x86@kernel.org,
linux-kernel@vger.kernel.org
Cc: Uros Bizjak <ubizjak@gmail.com>,
Richard Weinberger <richard@nod.at>,
Anton Ivanov <anton.ivanov@cambridgegreys.com>,
Johannes Berg <johannes@sipsolutions.net>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@kernel.org>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
"H. Peter Anvin" <hpa@zytor.com>
Subject: [PATCH] um/asm: Replace "REP; NOP" with PAUSE mnemonic
Date: Mon, 14 Apr 2025 16:55:57 +0200 [thread overview]
Message-ID: <20250414145650.10776-1-ubizjak@gmail.com> (raw)
Current minimum required version of binutils is 2.25,
which supports PAUSE instruction mnemonic.
Replace "REP; NOP" with this proper mnemonic.
No functional change intended.
Signed-off-by: Uros Bizjak <ubizjak@gmail.com>
Cc: Richard Weinberger <richard@nod.at>
Cc: Anton Ivanov <anton.ivanov@cambridgegreys.com>
Cc: Johannes Berg <johannes@sipsolutions.net>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
---
arch/x86/um/asm/processor.h | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/x86/um/asm/processor.h b/arch/x86/um/asm/processor.h
index 478710384b34..233a7a0d29c9 100644
--- a/arch/x86/um/asm/processor.h
+++ b/arch/x86/um/asm/processor.h
@@ -24,7 +24,7 @@
/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */
static __always_inline void rep_nop(void)
{
- __asm__ __volatile__("rep;nop": : :"memory");
+ __asm__ __volatile__("pause": : :"memory");
}
static __always_inline void cpu_relax(void)
--
2.42.0
next reply other threads:[~2025-04-14 15:01 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-14 14:55 Uros Bizjak [this message]
2025-04-15 17:55 ` [PATCH] um/asm: Replace "REP; NOP" with PAUSE mnemonic David Laight
2025-04-16 5:53 ` Uros Bizjak
2025-04-16 6:57 ` Uros Bizjak
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