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Date: Thu, 10 Dec 2020 20:25:37 +0100 From: Thomas Gleixner <tglx@...utronix.de> To: LKML <linux-kernel@...r.kernel.org> Cc: Peter Zijlstra <peterz@...radead.org>, Marc Zyngier <maz@...nel.org>, "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>, Helge Deller <deller@....de>, afzal mohammed <afzal.mohd.ma@...il.com>, linux-parisc@...r.kernel.org, Russell King <linux@...linux.org.uk>, linux-arm-kernel@...ts.infradead.org, Mark Rutland <mark.rutland@....com>, Catalin Marinas <catalin.marinas@....com>, Will Deacon <will@...nel.org>, Christian Borntraeger <borntraeger@...ibm.com>, Heiko Carstens <hca@...ux.ibm.com>, linux-s390@...r.kernel.org, Jani Nikula <jani.nikula@...ux.intel.com>, Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>, Rodrigo Vivi <rodrigo.vivi@...el.com>, David Airlie <airlied@...ux.ie>, Daniel Vetter <daniel@...ll.ch>, Pankaj Bharadiya <pankaj.laxminarayan.bharadiya@...el.com>, Chris Wilson <chris@...is-wilson.co.uk>, Wambui Karuga <wambui.karugax@...il.com>, intel-gfx@...ts.freedesktop.org, dri-devel@...ts.freedesktop.org, Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>, Linus Walleij <linus.walleij@...aro.org>, linux-gpio@...r.kernel.org, Lee Jones <lee.jones@...aro.org>, Jon Mason <jdmason@...zu.us>, Dave Jiang <dave.jiang@...el.com>, Allen Hubbe <allenbh@...il.com>, linux-ntb@...glegroups.com, Lorenzo Pieralisi <lorenzo.pieralisi@....com>, Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, Michal Simek <michal.simek@...inx.com>, linux-pci@...r.kernel.org, Karthikeyan Mitran <m.karthikeyan@...iveil.co.in>, Hou Zhiqiang <Zhiqiang.Hou@....com>, Tariq Toukan <tariqt@...dia.com>, "David S. Miller" <davem@...emloft.net>, Jakub Kicinski <kuba@...nel.org>, netdev@...r.kernel.org, linux-rdma@...r.kernel.org, Saeed Mahameed <saeedm@...dia.com>, Leon Romanovsky <leon@...nel.org>, Boris Ostrovsky <boris.ostrovsky@...cle.com>, Juergen Gross <jgross@...e.com>, Stefano Stabellini <sstabellini@...nel.org>, xen-devel@...ts.xenproject.org Subject: [patch 01/30] genirq: Move irq_has_action() into core code This function uses irq_to_desc() and is going to be used by modules to replace the open coded irq_to_desc() (ab)usage. The final goal is to remove the export of irq_to_desc() so driver cannot fiddle with it anymore. Move it into the core code and fixup the usage sites to include the proper header. Signed-off-by: Thomas Gleixner <tglx@...utronix.de> --- arch/alpha/kernel/sys_jensen.c | 2 +- arch/x86/kernel/topology.c | 1 + include/linux/interrupt.h | 1 + include/linux/irqdesc.h | 7 +------ kernel/irq/manage.c | 17 +++++++++++++++++ 5 files changed, 21 insertions(+), 7 deletions(-) --- a/arch/alpha/kernel/sys_jensen.c +++ b/arch/alpha/kernel/sys_jensen.c @@ -7,7 +7,7 @@ * * Code supporting the Jensen. */ - +#include <linux/interrupt.h> #include <linux/kernel.h> #include <linux/types.h> #include <linux/mm.h> --- a/arch/x86/kernel/topology.c +++ b/arch/x86/kernel/topology.c @@ -25,6 +25,7 @@ * * Send feedback to <colpatch@...ibm.com> */ +#include <linux/interrupt.h> #include <linux/nodemask.h> #include <linux/export.h> #include <linux/mmzone.h> --- a/include/linux/interrupt.h +++ b/include/linux/interrupt.h @@ -232,6 +232,7 @@ extern void devm_free_irq(struct device # define local_irq_enable_in_hardirq() local_irq_enable() #endif +bool irq_has_action(unsigned int irq); extern void disable_irq_nosync(unsigned int irq); extern bool disable_hardirq(unsigned int irq); extern void disable_irq(unsigned int irq); --- a/include/linux/irqdesc.h +++ b/include/linux/irqdesc.h @@ -179,12 +179,7 @@ int handle_domain_nmi(struct irq_domain /* Test to see if a driver has successfully requested an irq */ static inline int irq_desc_has_action(struct irq_desc *desc) { - return desc->action != NULL; -} - -static inline int irq_has_action(unsigned int irq) -{ - return irq_desc_has_action(irq_to_desc(irq)); + return desc && desc->action != NULL; } /** --- a/kernel/irq/manage.c +++ b/kernel/irq/manage.c @@ -2752,3 +2752,20 @@ int irq_set_irqchip_state(unsigned int i return err; } EXPORT_SYMBOL_GPL(irq_set_irqchip_state); + +/** + * irq_has_action - Check whether an interrupt is requested + * @irq: The linux irq number + * + * Returns: A snapshot of the current state + */ +bool irq_has_action(unsigned int irq) +{ + bool res; + + rcu_read_lock(); + res = irq_desc_has_action(irq_to_desc(irq)); + rcu_read_unlock(); + return res; +} +EXPORT_SYMBOL_GPL(irq_has_action);
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