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[188.141.5.72]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-483c3b346ccsm40390285e9.2.2026.02.26.04.45.19 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 26 Feb 2026 04:45:19 -0800 (PST) From: David Carlier To: Tejun Heo , David Vernet Cc: linux-kernel@vger.kernel.org, David Carlier Subject: [PATCH] sched_ext: Fix SCX_EFLAG_INITIALIZED being a no-op flag Date: Thu, 26 Feb 2026 12:45:17 +0000 Message-ID: <20260226124517.32643-1-devnexen@gmail.com> X-Mailer: git-send-email 2.51.0 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit SCX_EFLAG_INITIALIZED is the sole member of enum scx_exit_flags with no explicit value, so the compiler assigns it 0. This makes the bitwise OR in scx_ops_init() a no-op: sch->exit_info->flags |= SCX_EFLAG_INITIALIZED; /* |= 0 */ As a result, BPF schedulers cannot distinguish whether ops.init() completed successfully by inspecting exit_info->flags. Assign the value 1LLU << 0 so the flag is actually set. Signed-off-by: David Carlier --- kernel/sched/ext_internal.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/sched/ext_internal.h b/kernel/sched/ext_internal.h index 386c677e4c9a..11ebb744d893 100644 --- a/kernel/sched/ext_internal.h +++ b/kernel/sched/ext_internal.h @@ -74,7 +74,7 @@ enum scx_exit_flags { * info communication. The following flag indicates whether ops.init() * finished successfully. */ - SCX_EFLAG_INITIALIZED, + SCX_EFLAG_INITIALIZED = 1LLU << 0, }; /* -- 2.51.0