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Tue, 27 Jan 2026 19:14:21 -0800 (PST) Received: from DESKTOP-MOQC9AF.mioffice.cn ([43.224.245.239]) by smtp.gmail.com with ESMTPSA id d2e1a72fcca58-82379c56e20sm915471b3a.65.2026.01.27.19.14.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Jan 2026 19:14:21 -0800 (PST) From: Zhan Xusheng X-Google-Original-From: Zhan Xusheng To: Thomas Gleixner Cc: linux-kernel@vger.kernel.org, linux-irq@vger.kernel.org, Zhan Xusheng Subject: [PATCH v3 2/2] genirq/matrix: Avoid implicit tie-breaking by CPU iteration order Date: Wed, 28 Jan 2026 11:14:06 +0800 Message-ID: <20260128031406.9473-3-zhanxusheng@xiaomi.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20260128031406.9473-1-zhanxusheng@xiaomi.com> References: <87wm13bgd8.ffs@tglx> <20260128031406.9473-1-zhanxusheng@xiaomi.com> 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" matrix_find_best_cpu_managed() updates best_cpu even when two CPUs have the same managed_allocated count. As a result, the final selection implicitly depends on CPU iteration order. Update the comparison to replace the current best CPU only when a CPU has a strictly smaller managed_allocated value. This removes the iteration-order-based tie-breaking for equal cases. This patch intentionally changes the selection behavior. Signed-off-by: Zhan Xusheng --- kernel/irq/matrix.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/kernel/irq/matrix.c b/kernel/irq/matrix.c index c363e918087c..ed4b1e44dc1e 100644 --- a/kernel/irq/matrix.c +++ b/kernel/irq/matrix.c @@ -171,7 +171,7 @@ static unsigned int matrix_find_best_cpu_managed(struct= irq_matrix *m, if (!cm->online) continue; =20 - if (cm->managed_allocated <=3D allocated) { + if (cm->managed_allocated < allocated) { best_cpu =3D cpu; allocated =3D cm->managed_allocated; } --=20 2.43.0