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AJvYcCWGZ/D0MzJHaGgqHqV4/aQ8abi5s8sdroOt7pMLIxUWd73fnblBUVEU8zzpPWnxc7iQUoLMmPMmVFUewDY=@vger.kernel.org X-Gm-Message-State: AOJu0Yx2z6G36KzdLlQok5JQkYWsjP1mQB6g5LI11jIedK7oeL8tp1dY n3GvF6yqrgfrWdaIqWoIaNu8UhB544kyxmOsJ4UonmM59/Jz+FByIjmZRfYFlocCCccZUBEAmV9 zxdwPJfkxReoUGokRqgGJMDeQj/1BJA== X-Google-Smtp-Source: AGHT+IEIa3iCmSK88WeYaF57yxXrkmbmjgzKXsIudMzptYilutAUUKrusmtBqAF1jBuMVBsyJrYvu9lT45iuYPB4xpU= X-Received: from ploe2.prod.google.com ([2002:a17:903:2402:b0:290:2921:d4d3]) (user=willmcvicker job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:e944:b0:27d:69de:edd3 with SMTP id d9443c01a7336-290c9d2649bmr315429985ad.20.1761252789682; Thu, 23 Oct 2025 13:53:09 -0700 (PDT) Date: Thu, 23 Oct 2025 20:52:46 +0000 In-Reply-To: <20251023205257.2029526-1-willmcvicker@google.com> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20251023205257.2029526-1-willmcvicker@google.com> X-Mailer: git-send-email 2.51.1.821.gb6fe4d2222-goog Message-ID: <20251023205257.2029526-5-willmcvicker@google.com> Subject: [PATCH v5 4/7] clocksource/drivers/exynos_mct: Use percpu interrupts only on ARM64 From: Will McVicker To: Russell King , Catalin Marinas , Will Deacon , Daniel Lezcano , Thomas Gleixner , Krzysztof Kozlowski , Alim Akhtar , Hosung Kim , Will McVicker , Ingo Molnar , Peter Griffin , Youngmin Nam Cc: Donghoon Yu , Rob Herring , Saravana Kannan , John Stultz , Tudor Ambarus , "=?UTF-8?q?Andr=C3=A9=20Draszik?=" , Conor Dooley , Marek Szyprowski , linux-samsung-soc@vger.kernel.org, kernel-team@android.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, Krzysztof Kozlowski Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" From: Marek Szyprowski For some unknown reasons forcing percpu interrupts for local timers breaks CPU hotplug for 'little' cores on legacy ARM 32bit Exynos based machines (for example Exynos5422-based Odroid-XU3/XU4 boards). Use percpu flag only when driver is compiled for newer ARM64 architecture. Fixes: f3cec54ee3bf ("clocksource/drivers/exynos_mct: Set local timer inter= rupts as percpu") Signed-off-by: Marek Szyprowski Reviewed-by: Peter Griffin Reviewed-by: Krzysztof Kozlowski Suggested-by: Marek Szyprowski --- drivers/clocksource/exynos_mct.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/drivers/clocksource/exynos_mct.c b/drivers/clocksource/exynos_= mct.c index a5ef7d64b1c2..1429b9d03a58 100644 --- a/drivers/clocksource/exynos_mct.c +++ b/drivers/clocksource/exynos_mct.c @@ -597,7 +597,8 @@ static int __init exynos4_timer_interrupts(struct devic= e_node *np, if (request_irq(mct_irq, exynos4_mct_tick_isr, IRQF_TIMER | IRQF_NOBALANCING | - IRQF_PERCPU, + (IS_ENABLED(CONFIG_ARM64) ? + IRQF_PERCPU : 0), pcpu_mevt->name, pcpu_mevt)) { pr_err("exynos-mct: cannot register IRQ (cpu%d)\n", cpu); --=20 2.51.1.821.gb6fe4d2222-goog