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Sat, 26 Nov 2022 18:41:36 -0500 (EST) From: Samuel Holland To: Marc Zyngier , Thomas Gleixner , Palmer Dabbelt Cc: linux-riscv@lists.infradead.org, Samuel Holland , Paul Walmsley , linux-kernel@vger.kernel.org Subject: [PATCH 1/3] genirq: Simplify cond_unmask_eoi_irq() Date: Sat, 26 Nov 2022 17:41:32 -0600 Message-Id: <20221126234134.32660-2-samuel@sholland.org> X-Mailer: git-send-email 2.37.4 In-Reply-To: <20221126234134.32660-1-samuel@sholland.org> References: <20221126234134.32660-1-samuel@sholland.org> MIME-Version: 1.0 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20221126_154148_459646_E07BD4CF X-CRM114-Status: GOOD ( 12.93 ) X-BeenThere: linux-riscv@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-riscv" Errors-To: linux-riscv-bounces+linux-riscv=archiver.kernel.org@lists.infradead.org This function calls .irq_eoi in three places, making the logic hard to follow. Rearrange the function so that .irq_eoi is called only once. The only time .irq_eoi is not called is when all three if checks fail, so return early in that case. threads_oneshot can only be nonzero if IRQS_ONESHOT is set, so the IRQS_ONESHOT check can be omitted there. The IRQS_ONESHOT condition from the first if statement must then be copied to the unmask_irq() condition. Furthermore, if IRQS_ONESHOT is set, mask_irq() must have been called in the parent function, so the irqd_irq_masked() check is redundant. Signed-off-by: Samuel Holland --- kernel/irq/chip.c | 17 +++++++++-------- 1 file changed, 9 insertions(+), 8 deletions(-) diff --git a/kernel/irq/chip.c b/kernel/irq/chip.c index 8ac37e8e738a..672bad021a1f 100644 --- a/kernel/irq/chip.c +++ b/kernel/irq/chip.c @@ -658,10 +658,15 @@ EXPORT_SYMBOL_GPL(handle_level_irq); static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip) { - if (!(desc->istate & IRQS_ONESHOT)) { - chip->irq_eoi(&desc->irq_data); + /* + * Do not send an EOI if the thread will do it later in + * unmask_threaded_irq(). + */ + if ((chip->flags & IRQCHIP_EOI_THREADED) && desc->threads_oneshot) return; - } + + chip->irq_eoi(&desc->irq_data); + /* * We need to unmask in the following cases: * - Oneshot irq which did not wake the thread (caused by a @@ -669,12 +674,8 @@ static void cond_unmask_eoi_irq(struct irq_desc *desc, struct irq_chip *chip) * completely). */ if (!irqd_irq_disabled(&desc->irq_data) && - irqd_irq_masked(&desc->irq_data) && !desc->threads_oneshot) { - chip->irq_eoi(&desc->irq_data); + (desc->istate & IRQS_ONESHOT) && !desc->threads_oneshot) unmask_irq(desc); - } else if (!(chip->flags & IRQCHIP_EOI_THREADED)) { - chip->irq_eoi(&desc->irq_data); - } } /**