From 7d3a5eb78e3614b025389d2cd89d6d85e91f5549 Mon Sep 17 00:00:00 2001 From: Arnd Bergmann Date: Mon, 4 Mar 2019 21:02:18 +0100 Subject: [PATCH 01/13] irqchip/imx-irqsteer: Fix of_property_read_u32() error handling gcc points out that irqs_num is not initialized when of_property_read_u32() is an empty stub function: Included from drivers/irqchip/irq-imx-irqsteer.c:7: drivers/irqchip/irq-imx-irqsteer.c: In function 'imx_irqsteer_probe': include/uapi/linux/kernel.h:13:49: error: 'irqs_num' may be used uninitialized in this function [-Werror=maybe-uninitialized] The same can actually happen with CONFIG_OF=y as well, though we don't get a warning then. Add error checking here that lets the code deal with missing or invalid properties as well as avoid the warning. Fixes: 28528fca4908 ("irqchip/imx-irqsteer: Add multi output interrupts support") Signed-off-by: Arnd Bergmann Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-imx-irqsteer.c | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-) diff --git a/drivers/irqchip/irq-imx-irqsteer.c b/drivers/irqchip/irq-imx-irqsteer.c index d1098f4da6a4..88df3d00052c 100644 --- a/drivers/irqchip/irq-imx-irqsteer.c +++ b/drivers/irqchip/irq-imx-irqsteer.c @@ -169,8 +169,12 @@ static int imx_irqsteer_probe(struct platform_device *pdev) raw_spin_lock_init(&data->lock); - of_property_read_u32(np, "fsl,num-irqs", &irqs_num); - of_property_read_u32(np, "fsl,channel", &data->channel); + ret = of_property_read_u32(np, "fsl,num-irqs", &irqs_num); + if (ret) + return ret; + ret = of_property_read_u32(np, "fsl,channel", &data->channel); + if (ret) + return ret; /* * There is one output irq for each group of 64 inputs. From b41fdc4a7bf9045e4871c5b15905ea732ffd044f Mon Sep 17 00:00:00 2001 From: Marc Zyngier Date: Mon, 11 Mar 2019 15:38:10 +0000 Subject: [PATCH 02/13] irqchip/gic: Drop support for secondary GIC in non-DT systems We do not have any in-tree platform with this pathological setup, and only a single system (Cavium's cns3xxx) isn't DT aware. Let's drop the secondary GIC support for now, until we remove the above horror altogether. Signed-off-by: Marc Zyngier --- arch/arm/mach-cns3xxx/core.c | 2 +- drivers/irqchip/irq-gic.c | 45 ++++++++++++--------------------- include/linux/irqchip/arm-gic.h | 3 +-- 3 files changed, 18 insertions(+), 32 deletions(-) diff --git a/arch/arm/mach-cns3xxx/core.c b/arch/arm/mach-cns3xxx/core.c index 7d5a44a06648..f676592d8402 100644 --- a/arch/arm/mach-cns3xxx/core.c +++ b/arch/arm/mach-cns3xxx/core.c @@ -90,7 +90,7 @@ void __init cns3xxx_map_io(void) /* used by entry-macro.S */ void __init cns3xxx_init_irq(void) { - gic_init(0, 29, IOMEM(CNS3XXX_TC11MP_GIC_DIST_BASE_VIRT), + gic_init(IOMEM(CNS3XXX_TC11MP_GIC_DIST_BASE_VIRT), IOMEM(CNS3XXX_TC11MP_GIC_CPU_BASE_VIRT)); } diff --git a/drivers/irqchip/irq-gic.c b/drivers/irqchip/irq-gic.c index ba2a37a27a54..fd3110c171ba 100644 --- a/drivers/irqchip/irq-gic.c +++ b/drivers/irqchip/irq-gic.c @@ -1089,11 +1089,10 @@ static void gic_init_chip(struct gic_chip_data *gic, struct device *dev, #endif } -static int gic_init_bases(struct gic_chip_data *gic, int irq_start, +static int gic_init_bases(struct gic_chip_data *gic, struct fwnode_handle *handle) { - irq_hw_number_t hwirq_base; - int gic_irqs, irq_base, ret; + int gic_irqs, ret; if (IS_ENABLED(CONFIG_GIC_NON_BANKED) && gic->percpu_offset) { /* Frankein-GIC without banked registers... */ @@ -1145,28 +1144,21 @@ static int gic_init_bases(struct gic_chip_data *gic, int irq_start, } else { /* Legacy support */ /* * For primary GICs, skip over SGIs. - * For secondary GICs, skip over PPIs, too. + * No secondary GIC support whatsoever. */ - if (gic == &gic_data[0] && (irq_start & 31) > 0) { - hwirq_base = 16; - if (irq_start != -1) - irq_start = (irq_start & ~31) + 16; - } else { - hwirq_base = 32; - } + int irq_base; - gic_irqs -= hwirq_base; /* calculate # of irqs to allocate */ + gic_irqs -= 16; /* calculate # of irqs to allocate */ - irq_base = irq_alloc_descs(irq_start, 16, gic_irqs, + irq_base = irq_alloc_descs(16, 16, gic_irqs, numa_node_id()); if (irq_base < 0) { - WARN(1, "Cannot allocate irq_descs @ IRQ%d, assuming pre-allocated\n", - irq_start); - irq_base = irq_start; + WARN(1, "Cannot allocate irq_descs @ IRQ16, assuming pre-allocated\n"); + irq_base = 16; } gic->domain = irq_domain_add_legacy(NULL, gic_irqs, irq_base, - hwirq_base, &gic_irq_domain_ops, gic); + 16, &gic_irq_domain_ops, gic); } if (WARN_ON(!gic->domain)) { @@ -1195,7 +1187,6 @@ static int gic_init_bases(struct gic_chip_data *gic, int irq_start, } static int __init __gic_init_bases(struct gic_chip_data *gic, - int irq_start, struct fwnode_handle *handle) { char *name; @@ -1231,32 +1222,28 @@ static int __init __gic_init_bases(struct gic_chip_data *gic, gic_init_chip(gic, NULL, name, false); } - ret = gic_init_bases(gic, irq_start, handle); + ret = gic_init_bases(gic, handle); if (ret) kfree(name); return ret; } -void __init gic_init(unsigned int gic_nr, int irq_start, - void __iomem *dist_base, void __iomem *cpu_base) +void __init gic_init(void __iomem *dist_base, void __iomem *cpu_base) { struct gic_chip_data *gic; - if (WARN_ON(gic_nr >= CONFIG_ARM_GIC_MAX_NR)) - return; - /* * Non-DT/ACPI systems won't run a hypervisor, so let's not * bother with these... */ static_branch_disable(&supports_deactivate_key); - gic = &gic_data[gic_nr]; + gic = &gic_data[0]; gic->raw_dist_base = dist_base; gic->raw_cpu_base = cpu_base; - __gic_init_bases(gic, irq_start, NULL); + __gic_init_bases(gic, NULL); } static void gic_teardown(struct gic_chip_data *gic) @@ -1399,7 +1386,7 @@ int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq) if (ret) return ret; - ret = gic_init_bases(*gic, -1, &dev->of_node->fwnode); + ret = gic_init_bases(*gic, &dev->of_node->fwnode); if (ret) { gic_teardown(*gic); return ret; @@ -1459,7 +1446,7 @@ gic_of_init(struct device_node *node, struct device_node *parent) if (gic_cnt == 0 && !gic_check_eoimode(node, &gic->raw_cpu_base)) static_branch_disable(&supports_deactivate_key); - ret = __gic_init_bases(gic, -1, &node->fwnode); + ret = __gic_init_bases(gic, &node->fwnode); if (ret) { gic_teardown(gic); return ret; @@ -1650,7 +1637,7 @@ static int __init gic_v2_acpi_init(struct acpi_subtable_header *header, return -ENOMEM; } - ret = __gic_init_bases(gic, -1, domain_handle); + ret = __gic_init_bases(gic, domain_handle); if (ret) { pr_err("Failed to initialise GIC\n"); irq_domain_free_fwnode(domain_handle); diff --git a/include/linux/irqchip/arm-gic.h b/include/linux/irqchip/arm-gic.h index 626179077bb0..0f049b384ccd 100644 --- a/include/linux/irqchip/arm-gic.h +++ b/include/linux/irqchip/arm-gic.h @@ -158,8 +158,7 @@ int gic_of_init_child(struct device *dev, struct gic_chip_data **gic, int irq); * Legacy platforms not converted to DT yet must use this to init * their GIC */ -void gic_init(unsigned int nr, int start, - void __iomem *dist , void __iomem *cpu); +void gic_init(void __iomem *dist , void __iomem *cpu); int gicv2m_init(struct fwnode_handle *parent_handle, struct irq_domain *parent); From 89dc891792c2e046b030f87600109c22209da32e Mon Sep 17 00:00:00 2001 From: Rasmus Villemoes Date: Tue, 12 Mar 2019 18:33:46 +0100 Subject: [PATCH 03/13] irqchip/gic-v3-its: Fix comparison logic in lpi_range_cmp The lpi_range_list is supposed to be sorted in ascending order of ->base_id (at least if the range merging is to work), but the current comparison function returns a positive value if rb->base_id > ra->base_id, which means that list_sort() will put A after B in that case - and vice versa, of course. Fixes: 880cb3cddd16 (irqchip/gic-v3-its: Refactor LPI allocator) Cc: stable@vger.kernel.org (v4.19+) Signed-off-by: Rasmus Villemoes Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-gic-v3-its.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/irqchip/irq-gic-v3-its.c b/drivers/irqchip/irq-gic-v3-its.c index fb7157188294..783810716015 100644 --- a/drivers/irqchip/irq-gic-v3-its.c +++ b/drivers/irqchip/irq-gic-v3-its.c @@ -1476,7 +1476,7 @@ static int lpi_range_cmp(void *priv, struct list_head *a, struct list_head *b) ra = container_of(a, struct lpi_range, entry); rb = container_of(b, struct lpi_range, entry); - return rb->base_id - ra->base_id; + return ra->base_id - rb->base_id; } static void merge_lpi_ranges(void) From 551417af91b163bd697eb50b3601adae2177c28a Mon Sep 17 00:00:00 2001 From: Peter Xu Date: Mon, 18 Mar 2019 14:51:23 +0800 Subject: [PATCH 04/13] genirq: Fix typo in comment of IRQD_MOVE_PCNTXT Signed-off-by: Peter Xu Signed-off-by: Thomas Gleixner Cc: Marc Zyngier Cc: Dou Liyang Cc: Julien Thierry Link: https://lkml.kernel.org/r/20190318065123.11862-1-peterx@redhat.com --- include/linux/irq.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/linux/irq.h b/include/linux/irq.h index d6160d479b14..7ae8de5ad0f2 100644 --- a/include/linux/irq.h +++ b/include/linux/irq.h @@ -195,7 +195,7 @@ struct irq_data { * IRQD_LEVEL - Interrupt is level triggered * IRQD_WAKEUP_STATE - Interrupt is configured for wakeup * from suspend - * IRDQ_MOVE_PCNTXT - Interrupt can be moved in process + * IRQD_MOVE_PCNTXT - Interrupt can be moved in process * context * IRQD_IRQ_DISABLED - Disabled state of the interrupt * IRQD_IRQ_MASKED - Masked state of the interrupt From dc3173c7067ebbac44ed4a5c3636dc0ff27f981b Mon Sep 17 00:00:00 2001 From: YueHaibing Date: Wed, 20 Mar 2019 22:22:20 +0800 Subject: [PATCH 05/13] irqchip/brcmstb-l2: Make two init functions static Fix sparse warnings: drivers/irqchip/irq-brcmstb-l2.c:278:12: warning: symbol 'brcmstb_l2_edge_intc_of_init' was not declared. Should it be static? drivers/irqchip/irq-brcmstb-l2.c:285:12: warning: symbol 'brcmstb_l2_lvl_intc_of_init' was not declared. Should it be static? Signed-off-by: YueHaibing Reviewed-by: Florian Fainelli Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-brcmstb-l2.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/irqchip/irq-brcmstb-l2.c b/drivers/irqchip/irq-brcmstb-l2.c index 83364fedbf0a..5e4ca139e4ea 100644 --- a/drivers/irqchip/irq-brcmstb-l2.c +++ b/drivers/irqchip/irq-brcmstb-l2.c @@ -275,14 +275,14 @@ static int __init brcmstb_l2_intc_of_init(struct device_node *np, return ret; } -int __init brcmstb_l2_edge_intc_of_init(struct device_node *np, +static int __init brcmstb_l2_edge_intc_of_init(struct device_node *np, struct device_node *parent) { return brcmstb_l2_intc_of_init(np, parent, &l2_edge_intc_init); } IRQCHIP_DECLARE(brcmstb_l2_intc, "brcm,l2-intc", brcmstb_l2_edge_intc_of_init); -int __init brcmstb_l2_lvl_intc_of_init(struct device_node *np, +static int __init brcmstb_l2_lvl_intc_of_init(struct device_node *np, struct device_node *parent) { return brcmstb_l2_intc_of_init(np, parent, &l2_lvl_intc_init); From 096048cb120d5318b3a9a7c1e062a4b11c0e80ab Mon Sep 17 00:00:00 2001 From: YueHaibing Date: Wed, 20 Mar 2019 21:40:27 +0800 Subject: [PATCH 06/13] irqchip/mmp: Make mmp_irq_domain_ops static Fix sparse warning: drivers/irqchip/irq-mmp.c:182:29: warning: symbol 'mmp_irq_domain_ops' was not declared. Should it be static? Signed-off-by: YueHaibing Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-mmp.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/irqchip/irq-mmp.c b/drivers/irqchip/irq-mmp.c index 25f32e1d7764..85d1c4d49572 100644 --- a/drivers/irqchip/irq-mmp.c +++ b/drivers/irqchip/irq-mmp.c @@ -176,7 +176,7 @@ static int mmp_irq_domain_xlate(struct irq_domain *d, struct device_node *node, return 0; } -const struct irq_domain_ops mmp_irq_domain_ops = { +static const struct irq_domain_ops mmp_irq_domain_ops = { .map = mmp_irq_domain_map, .xlate = mmp_irq_domain_xlate, }; From 24105bf4d10485143f8e26337cda8bcb7f6e6da5 Mon Sep 17 00:00:00 2001 From: Fabrizio Castro Date: Tue, 19 Mar 2019 11:02:01 +0000 Subject: [PATCH 07/13] dt-bindings: irqchip: renesas-irqc: Document r8a774c0 support Document RZ/G2E (R8A774C0) SoC bindings. Signed-off-by: Fabrizio Castro Reviewed-by: Geert Uytterhoeven Reviewed-by: Simon Horman Reviewed-by: Rob Herring Signed-off-by: Marc Zyngier --- .../devicetree/bindings/interrupt-controller/renesas,irqc.txt | 1 + 1 file changed, 1 insertion(+) diff --git a/Documentation/devicetree/bindings/interrupt-controller/renesas,irqc.txt b/Documentation/devicetree/bindings/interrupt-controller/renesas,irqc.txt index 8de96a4fb2d5..f977ea7617f6 100644 --- a/Documentation/devicetree/bindings/interrupt-controller/renesas,irqc.txt +++ b/Documentation/devicetree/bindings/interrupt-controller/renesas,irqc.txt @@ -16,6 +16,7 @@ Required properties: - "renesas,irqc-r8a7793" (R-Car M2-N) - "renesas,irqc-r8a7794" (R-Car E2) - "renesas,intc-ex-r8a774a1" (RZ/G2M) + - "renesas,intc-ex-r8a774c0" (RZ/G2E) - "renesas,intc-ex-r8a7795" (R-Car H3) - "renesas,intc-ex-r8a7796" (R-Car M3-W) - "renesas,intc-ex-r8a77965" (R-Car M3-N) From 0dda09666f50eae9c5b794dd89b1fd8a8d89d714 Mon Sep 17 00:00:00 2001 From: Fabien Dessenne Date: Thu, 7 Mar 2019 19:40:35 +0100 Subject: [PATCH 08/13] irqchip/stm32: Don't clear rising/falling config registers at init Falling and rising configuration and status registers are not banked. As they are shared with M4 co-processor, they should not be cleared at probe time, else M4 co-processor configuration will be lost. Fixes: f9fc1745501e ("irqchip/stm32: Add host and driver data structures") Signed-off-by: Loic Pallardy Signed-off-by: Fabien Dessenne Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-stm32-exti.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c index 6edfd4bfa169..dab37fbfab82 100644 --- a/drivers/irqchip/irq-stm32-exti.c +++ b/drivers/irqchip/irq-stm32-exti.c @@ -735,11 +735,6 @@ stm32_exti_chip_data *stm32_exti_chip_init(struct stm32_exti_host_data *h_data, */ writel_relaxed(0, base + stm32_bank->imr_ofst); writel_relaxed(0, base + stm32_bank->emr_ofst); - writel_relaxed(0, base + stm32_bank->rtsr_ofst); - writel_relaxed(0, base + stm32_bank->ftsr_ofst); - writel_relaxed(~0UL, base + stm32_bank->rpr_ofst); - if (stm32_bank->fpr_ofst != UNDEF_REG) - writel_relaxed(~0UL, base + stm32_bank->fpr_ofst); pr_info("%pOF: bank%d\n", h_data->node, bank_idx); From 6a77623d78b307b34d4cf7886da6a907689bf388 Mon Sep 17 00:00:00 2001 From: Fabien Dessenne Date: Thu, 7 Mar 2019 19:40:36 +0100 Subject: [PATCH 09/13] irqchip/stm32: Don't set rising configuration registers at init The rising configuration status register (rtsr) is not banked. As it is shared with the co-processor, it should not be written at probe time, else the co-processor configuration will be lost. Fixes: f9fc1745501e ("irqchip/stm32: Add host and driver data structures") Signed-off-by: Fabien Dessenne Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-stm32-exti.c | 5 ----- 1 file changed, 5 deletions(-) diff --git a/drivers/irqchip/irq-stm32-exti.c b/drivers/irqchip/irq-stm32-exti.c index dab37fbfab82..6b19bffbad78 100644 --- a/drivers/irqchip/irq-stm32-exti.c +++ b/drivers/irqchip/irq-stm32-exti.c @@ -716,7 +716,6 @@ stm32_exti_chip_data *stm32_exti_chip_init(struct stm32_exti_host_data *h_data, const struct stm32_exti_bank *stm32_bank; struct stm32_exti_chip_data *chip_data; void __iomem *base = h_data->base; - u32 irqs_mask; stm32_bank = h_data->drv_data->exti_banks[bank_idx]; chip_data = &h_data->chips_data[bank_idx]; @@ -725,10 +724,6 @@ stm32_exti_chip_data *stm32_exti_chip_init(struct stm32_exti_host_data *h_data, raw_spin_lock_init(&chip_data->rlock); - /* Determine number of irqs supported */ - writel_relaxed(~0UL, base + stm32_bank->rtsr_ofst); - irqs_mask = readl_relaxed(base + stm32_bank->rtsr_ofst); - /* * This IP has no reset, so after hot reboot we should * clear registers to avoid residue From fca269f201a8d9985c0a31fb60b15d4eb57cef80 Mon Sep 17 00:00:00 2001 From: Jianguo Chen Date: Wed, 20 Mar 2019 18:54:21 +0000 Subject: [PATCH 10/13] irqchip/mbigen: Don't clear eventid when freeing an MSI mbigen_write_msg clears eventid bits of a mbigen register when free a interrupt, because msi_domain_deactivate memset struct msg to zero. Then multiple mbigen pins with zero eventid will report the same interrupt number. The eventid clear call trace: free_irq __free_irq irq_shutdown irq_domain_deactivate_irq __irq_domain_deactivate_irq __irq_domain_deactivate_irq msi_domain_deactivate platform_msi_write_msg mbigen_write_msg Signed-off-by: Jianguo Chen [maz: massaged subject] Signed-off-by: Marc Zyngier --- drivers/irqchip/irq-mbigen.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/irqchip/irq-mbigen.c b/drivers/irqchip/irq-mbigen.c index 567b29c47608..98b6e1d4b1a6 100644 --- a/drivers/irqchip/irq-mbigen.c +++ b/drivers/irqchip/irq-mbigen.c @@ -161,6 +161,9 @@ static void mbigen_write_msg(struct msi_desc *desc, struct msi_msg *msg) void __iomem *base = d->chip_data; u32 val; + if (!msg->address_lo && !msg->address_hi) + return; + base += get_mbigen_vec_reg(d->hwirq); val = readl_relaxed(base); From f27b744baaa646a7c0a01443cc0d8b4787cac2f7 Mon Sep 17 00:00:00 2001 From: YueHaibing Date: Thu, 21 Mar 2019 23:14:48 +0800 Subject: [PATCH 11/13] irqchip/irq-mvebu-sei: Make mvebu_sei_ap806_caps static Fix sparse warning: drivers/irqchip/irq-mvebu-sei.c:481:23: warning: symbol 'mvebu_sei_ap806_caps' was not declared. Should it be static? Signed-off-by: YueHaibing Signed-off-by: Thomas Gleixner Cc: Cc: Cc: Cc: Cc: Cc: Link: https://lkml.kernel.org/r/20190321151448.15600-1-yuehaibing@huawei.com --- drivers/irqchip/irq-mvebu-sei.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/irqchip/irq-mvebu-sei.c b/drivers/irqchip/irq-mvebu-sei.c index add4c9c934c8..18832ccc8ff8 100644 --- a/drivers/irqchip/irq-mvebu-sei.c +++ b/drivers/irqchip/irq-mvebu-sei.c @@ -478,7 +478,7 @@ static int mvebu_sei_probe(struct platform_device *pdev) return ret; } -struct mvebu_sei_caps mvebu_sei_ap806_caps = { +static struct mvebu_sei_caps mvebu_sei_ap806_caps = { .ap_range = { .first = 0, .size = 21, From bb2e320565f997273fe04035bb6c17f643da6f8a Mon Sep 17 00:00:00 2001 From: Valdis Kletnieks Date: Tue, 12 Mar 2019 04:17:56 -0400 Subject: [PATCH 12/13] genirq/devres: Remove excess parameter from kernel doc Building with 'make W=1' complains: CC kernel/irq/devres.o kernel/irq/devres.c:104: warning: Excess function parameter 'thread_fn' description in 'devm_request_any_context_irq' Remove it. Signed-off-by: Valdis Kletnieks Signed-off-by: Thomas Gleixner Link: https://lkml.kernel.org/r/31207.1552378676@turing-police --- kernel/irq/devres.c | 2 -- 1 file changed, 2 deletions(-) diff --git a/kernel/irq/devres.c b/kernel/irq/devres.c index 5d5378ea0afe..f808c6a97dcc 100644 --- a/kernel/irq/devres.c +++ b/kernel/irq/devres.c @@ -84,8 +84,6 @@ EXPORT_SYMBOL(devm_request_threaded_irq); * @dev: device to request interrupt for * @irq: Interrupt line to allocate * @handler: Function to be called when the IRQ occurs - * @thread_fn: function to be called in a threaded interrupt context. NULL - * for devices which handle everything in @handler * @irqflags: Interrupt type flags * @devname: An ascii name for the claiming device, dev_name(dev) if NULL * @dev_id: A cookie passed back to the handler function From 93417a3fda2060f2a34e3341904024c5b6980d1f Mon Sep 17 00:00:00 2001 From: "Gustavo A. R. Silva" Date: Thu, 28 Feb 2019 15:37:14 -0600 Subject: [PATCH 13/13] genirq: Mark expected switch case fall-through MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit In preparation to enabling -Wimplicit-fallthrough, mark switch cases where we are expecting to fall through. With -Wimplicit-fallthrough added to CFLAGS: kernel/irq/manage.c: In function ‘irq_do_set_affinity’: kernel/irq/manage.c:198:3: warning: this statement may fall through [-Wimplicit-fallthrough=] cpumask_copy(desc->irq_common_data.affinity, mask); ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ kernel/irq/manage.c:199:2: note: here case IRQ_SET_MASK_OK_NOCOPY: ^~~~ Annotate it. Signed-off-by: Gustavo A. R. Silva Signed-off-by: Thomas Gleixner Cc: Kees Cook Link: https://lkml.kernel.org/r/20190228213714.GA9246@embeddedor --- kernel/irq/manage.c | 1 + 1 file changed, 1 insertion(+) diff --git a/kernel/irq/manage.c b/kernel/irq/manage.c index 9ec34a2a6638..1401afa0d58a 100644 --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -196,6 +196,7 @@ int irq_do_set_affinity(struct irq_data *data, const struct cpumask *mask, case IRQ_SET_MASK_OK: case IRQ_SET_MASK_OK_DONE: cpumask_copy(desc->irq_common_data.affinity, mask); + /* fall through */ case IRQ_SET_MASK_OK_NOCOPY: irq_validate_effective_affinity(data); irq_set_thread_affinity(desc);