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([193.77.86.199]) by smtp.gmail.com with ESMTPSA id 4fb4d7f45d1cf-5f625833ef1sm720914a12.51.2025.04.18.01.34.39 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 18 Apr 2025 01:34:39 -0700 (PDT) From: Uros Bizjak To: linux-um@lists.infradead.org, x86@kernel.org, linux-kernel@vger.kernel.org Cc: Uros Bizjak , Richard Weinberger , Anton Ivanov , Johannes Berg , Thomas Gleixner , Ingo Molnar , Borislav Petkov , Dave Hansen , "H. Peter Anvin" , David Laight Subject: [PATCH v2 2/2] um/asm: Replace "REP; NOP" with PAUSE mnemonic Date: Fri, 18 Apr 2025 10:33:59 +0200 Message-ID: <20250418083436.133148-2-ubizjak@gmail.com> X-Mailer: git-send-email 2.49.0 In-Reply-To: <20250418083436.133148-1-ubizjak@gmail.com> References: <20250418083436.133148-1-ubizjak@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250418_013443_095645_D1666C85 X-CRM114-Status: GOOD ( 11.74 ) X-BeenThere: linux-um@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-um" Errors-To: linux-um-bounces+linux-um=archiver.kernel.org@lists.infradead.org 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 Cc: Richard Weinberger Cc: Anton Ivanov Cc: Johannes Berg Cc: Thomas Gleixner Cc: Ingo Molnar Cc: Borislav Petkov Cc: Dave Hansen Cc: "H. Peter Anvin" Cc: David Laight --- v2: Rename rep_nop() to native_pause() first. --- arch/x86/um/asm/processor.h | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/arch/x86/um/asm/processor.h b/arch/x86/um/asm/processor.h index d50549e0089c..e222d2ae28fd 100644 --- a/arch/x86/um/asm/processor.h +++ b/arch/x86/um/asm/processor.h @@ -21,10 +21,10 @@ #include -/* REP NOP (PAUSE) is a good thing to insert into busy-wait loops. */ +/* PAUSE is a good thing to insert into busy-wait loops. */ static __always_inline void native_pause(void) { - __asm__ __volatile__("rep;nop": : :"memory"); + __asm__ __volatile__("pause": : :"memory"); } static __always_inline void cpu_relax(void) -- 2.49.0