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Mon, 26 May 2025 09:09:34 -0700 (PDT) Received: from CHINAMI-1168E6D.localdomain ([42.89.86.14]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-23401ab6c69sm51708125ad.67.2025.05.26.09.09.30 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 26 May 2025 09:09:34 -0700 (PDT) From: Jony Lynn <1198715581lxf@gmail.com> To: Ingo Molnar , Peter Zijlstra , Juri Lelli , Vincent Guittot , Dietmar Eggemann , Steven Rostedt , Ben Segall , Mel Gorman , Daniel Bristot de Oliveira , Valentin Schneider , linux-kernel@vger.kernel.org Cc: Jony Lynn <1198715581lxf@gmail.com>, kernel test robot Subject: [PATCH] sched/smp: Fix redefinition of flush_smp_call_function_queue() Date: Tue, 27 May 2025 00:08:42 +0800 Message-ID: <20250526160842.567434-1-1198715581lxf@gmail.com> X-Mailer: git-send-email 2.43.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The header file kernel/sched/smp.h currently defines flush_smp_call_function_queue() unconditionally in the #else branch, but lacks appropriate header guards, which causes multiple inclusion and a redefinition error during compilation. This patch adds a proper header guard to prevent multiple inclusion of kernel/sched/smp.h and thus avoid the redefinition of flush_smp_call_function_queue() when included multiple times in different compilation units. Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202505262213.QsOaQU24-lkp@int= el.com/ Signed-off-by: Jony Lynn <1198715581lxf@gmail.com> --- kernel/sched/smp.h | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/kernel/sched/smp.h b/kernel/sched/smp.h index 21ac44428bb0..8f1483b79e60 100644 --- a/kernel/sched/smp.h +++ b/kernel/sched/smp.h @@ -4,6 +4,9 @@ * and other internal parts of the core kernel: */ =20 +#ifndef _KERNEL_SCHED_SMP_H +#define _KERNEL_SCHED_SMP_H + extern void sched_ttwu_pending(void *arg); =20 extern bool call_function_single_prep_ipi(int cpu); @@ -13,3 +16,5 @@ extern void flush_smp_call_function_queue(void); #else static inline void flush_smp_call_function_queue(void) { } #endif + +#endif --=20 2.43.0