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Message-ID: <20140906133513.GA1471@lerouge>
Date: Sat, 6 Sep 2014 15:35:15 +0200
From: Frederic Weisbecker <fweisbec@...il.com>
To: Peter Zijlstra <peterz@...radead.org>
Cc: LKML <linux-kernel@...r.kernel.org>,
Catalin Iacob <iacobcatalin@...il.com>,
Dave Jones <davej@...hat.com>, Ingo Molnar <mingo@...nel.org>,
"Paul E. McKenney" <paulmck@...ux.vnet.ibm.com>,
Thomas Gleixner <tglx@...utronix.de>
Subject: Re: [RFC PATCH 3/9] irq_work: Force raised irq work to run on irq
work interrupt
On Thu, Sep 04, 2014 at 08:11:37AM +0200, Peter Zijlstra wrote:
> On Thu, Aug 21, 2014 at 04:52:51PM +0200, Frederic Weisbecker wrote:
> > diff --git a/kernel/irq_work.c b/kernel/irq_work.c
> > index e6bcbe7..17bd203 100644
> > --- a/kernel/irq_work.c
> > +++ b/kernel/irq_work.c
> > @@ -22,6 +22,7 @@
> >
> > static DEFINE_PER_CPU(struct llist_head, raised_list);
> > static DEFINE_PER_CPU(struct llist_head, lazy_list);
> > +static bool has_own_interrupt;
> >
> > /*
> > * Claim the entry so that no one else will poke at it.
>
> > +void irq_work_tick(void)
> > +{
> > + if (!has_own_interrupt)
> > + irq_work_run_list(&__get_cpu_var(raised_list));
> > + irq_work_run_list(&__get_cpu_var(lazy_list));
> > +}
> > +
> > /*
> > * Synchronize against the irq_work @entry, ensures the entry is not
> > * currently in use.
>
> Why not something like the below; then it becomes a compile time matter.
You have a script that does that arch/*/include/asm/Kbuild edit for you right?
Is this something in scripts/ ?
Thanks.
> ---
> diff --git a/arch/alpha/include/asm/Kbuild b/arch/alpha/include/asm/Kbuild
> index e858aa0..a52cbf1 100644
> --- a/arch/alpha/include/asm/Kbuild
> +++ b/arch/alpha/include/asm/Kbuild
> @@ -4,6 +4,7 @@ generic-y += clkdev.h
> generic-y += cputime.h
> generic-y += exec.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += mcs_spinlock.h
> generic-y += preempt.h
> generic-y += scatterlist.h
> diff --git a/arch/arc/include/asm/Kbuild b/arch/arc/include/asm/Kbuild
> index e76fd79..b8fffc1 100644
> --- a/arch/arc/include/asm/Kbuild
> +++ b/arch/arc/include/asm/Kbuild
> @@ -18,6 +18,7 @@ generic-y += ioctl.h
> generic-y += ioctls.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kmap_types.h
> generic-y += kvm_para.h
> generic-y += local.h
> diff --git a/arch/arm/include/asm/Kbuild b/arch/arm/include/asm/Kbuild
> index 70cd84e..202905e 100644
> --- a/arch/arm/include/asm/Kbuild
> +++ b/arch/arm/include/asm/Kbuild
> @@ -11,6 +11,7 @@ generic-y += hash.h
> generic-y += ioctl.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += local.h
> generic-y += local64.h
> diff --git a/arch/arm64/include/asm/Kbuild b/arch/arm64/include/asm/Kbuild
> index 0b3fcf8..d617789 100644
> --- a/arch/arm64/include/asm/Kbuild
> +++ b/arch/arm64/include/asm/Kbuild
> @@ -9,8 +9,8 @@ generic-y += current.h
> generic-y += delay.h
> generic-y += div64.h
> generic-y += dma.h
> -generic-y += emergency-restart.h
> generic-y += early_ioremap.h
> +generic-y += emergency-restart.h
> generic-y += errno.h
> generic-y += ftrace.h
> generic-y += hash.h
> @@ -19,6 +19,7 @@ generic-y += ioctl.h
> generic-y += ioctls.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += kmap_types.h
> generic-y += kvm_para.h
> diff --git a/arch/avr32/include/asm/Kbuild b/arch/avr32/include/asm/Kbuild
> index 00a0f3c..2a71b1c 100644
> --- a/arch/avr32/include/asm/Kbuild
> +++ b/arch/avr32/include/asm/Kbuild
> @@ -9,6 +9,7 @@ generic-y += exec.h
> generic-y += futex.h
> generic-y += hash.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += local.h
> generic-y += local64.h
> generic-y += mcs_spinlock.h
> diff --git a/arch/blackfin/include/asm/Kbuild b/arch/blackfin/include/asm/Kbuild
> index 0d93b9a..46ed6bb 100644
> --- a/arch/blackfin/include/asm/Kbuild
> +++ b/arch/blackfin/include/asm/Kbuild
> @@ -15,6 +15,7 @@ generic-y += hw_irq.h
> generic-y += ioctl.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += kmap_types.h
> generic-y += kvm_para.h
> diff --git a/arch/c6x/include/asm/Kbuild b/arch/c6x/include/asm/Kbuild
> index 8dbdce8..e77e0c1 100644
> --- a/arch/c6x/include/asm/Kbuild
> +++ b/arch/c6x/include/asm/Kbuild
> @@ -22,6 +22,7 @@ generic-y += ioctl.h
> generic-y += ioctls.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += kmap_types.h
> generic-y += local.h
> diff --git a/arch/cris/include/asm/Kbuild b/arch/cris/include/asm/Kbuild
> index 31742df..802b94c4 100644
> --- a/arch/cris/include/asm/Kbuild
> +++ b/arch/cris/include/asm/Kbuild
> @@ -8,6 +8,7 @@ generic-y += clkdev.h
> generic-y += cputime.h
> generic-y += exec.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += kvm_para.h
> generic-y += linkage.h
> generic-y += mcs_spinlock.h
> diff --git a/arch/frv/include/asm/Kbuild b/arch/frv/include/asm/Kbuild
> index 5b73921..3caf05c 100644
> --- a/arch/frv/include/asm/Kbuild
> +++ b/arch/frv/include/asm/Kbuild
> @@ -3,6 +3,7 @@ generic-y += clkdev.h
> generic-y += cputime.h
> generic-y += exec.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += mcs_spinlock.h
> generic-y += preempt.h
> generic-y += scatterlist.h
> diff --git a/arch/hexagon/include/asm/Kbuild b/arch/hexagon/include/asm/Kbuild
> index 0e69796..5f234a5 100644
> --- a/arch/hexagon/include/asm/Kbuild
> +++ b/arch/hexagon/include/asm/Kbuild
> @@ -23,6 +23,7 @@ generic-y += ioctls.h
> generic-y += iomap.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += kmap_types.h
> generic-y += local.h
> diff --git a/arch/ia64/include/asm/Kbuild b/arch/ia64/include/asm/Kbuild
> index e8317d2..747320b 100644
> --- a/arch/ia64/include/asm/Kbuild
> +++ b/arch/ia64/include/asm/Kbuild
> @@ -2,6 +2,7 @@
> generic-y += clkdev.h
> generic-y += exec.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += kvm_para.h
> generic-y += mcs_spinlock.h
> generic-y += preempt.h
> diff --git a/arch/m32r/include/asm/Kbuild b/arch/m32r/include/asm/Kbuild
> index accc10a..e02448b 100644
> --- a/arch/m32r/include/asm/Kbuild
> +++ b/arch/m32r/include/asm/Kbuild
> @@ -3,6 +3,7 @@ generic-y += clkdev.h
> generic-y += cputime.h
> generic-y += exec.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += mcs_spinlock.h
> generic-y += module.h
> generic-y += preempt.h
> diff --git a/arch/m68k/include/asm/Kbuild b/arch/m68k/include/asm/Kbuild
> index c67c94a..dbaf9f3 100644
> --- a/arch/m68k/include/asm/Kbuild
> +++ b/arch/m68k/include/asm/Kbuild
> @@ -11,6 +11,7 @@ generic-y += hw_irq.h
> generic-y += ioctl.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += kmap_types.h
> generic-y += kvm_para.h
> diff --git a/arch/metag/include/asm/Kbuild b/arch/metag/include/asm/Kbuild
> index c29ead8..7b8111c 100644
> --- a/arch/metag/include/asm/Kbuild
> +++ b/arch/metag/include/asm/Kbuild
> @@ -19,6 +19,7 @@ generic-y += ioctl.h
> generic-y += ioctls.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += kmap_types.h
> generic-y += kvm_para.h
> diff --git a/arch/microblaze/include/asm/Kbuild b/arch/microblaze/include/asm/Kbuild
> index 27a3acd..448143b 100644
> --- a/arch/microblaze/include/asm/Kbuild
> +++ b/arch/microblaze/include/asm/Kbuild
> @@ -5,6 +5,7 @@ generic-y += cputime.h
> generic-y += device.h
> generic-y += exec.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += mcs_spinlock.h
> generic-y += preempt.h
> generic-y += scatterlist.h
> diff --git a/arch/mips/include/asm/Kbuild b/arch/mips/include/asm/Kbuild
> index 335e529..57012ef 100644
> --- a/arch/mips/include/asm/Kbuild
> +++ b/arch/mips/include/asm/Kbuild
> @@ -3,6 +3,7 @@ generic-y += cputime.h
> generic-y += current.h
> generic-y += emergency-restart.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += local64.h
> generic-y += mcs_spinlock.h
> generic-y += mutex.h
> diff --git a/arch/mn10300/include/asm/Kbuild b/arch/mn10300/include/asm/Kbuild
> index ecbd667..77eb1a6 100644
> --- a/arch/mn10300/include/asm/Kbuild
> +++ b/arch/mn10300/include/asm/Kbuild
> @@ -4,6 +4,7 @@ generic-y += clkdev.h
> generic-y += cputime.h
> generic-y += exec.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += mcs_spinlock.h
> generic-y += preempt.h
> generic-y += scatterlist.h
> diff --git a/arch/openrisc/include/asm/Kbuild b/arch/openrisc/include/asm/Kbuild
> index 480af0d..89b61d7 100644
> --- a/arch/openrisc/include/asm/Kbuild
> +++ b/arch/openrisc/include/asm/Kbuild
> @@ -31,6 +31,7 @@ generic-y += ioctl.h
> generic-y += ioctls.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += kmap_types.h
> generic-y += kvm_para.h
> diff --git a/arch/parisc/include/asm/Kbuild b/arch/parisc/include/asm/Kbuild
> index ecf25e6..ffb024b 100644
> --- a/arch/parisc/include/asm/Kbuild
> +++ b/arch/parisc/include/asm/Kbuild
> @@ -10,6 +10,7 @@ generic-y += exec.h
> generic-y += hash.h
> generic-y += hw_irq.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += kvm_para.h
> generic-y += local.h
> diff --git a/arch/powerpc/include/asm/Kbuild b/arch/powerpc/include/asm/Kbuild
> index 7f23f16..31e8f59 100644
> --- a/arch/powerpc/include/asm/Kbuild
> +++ b/arch/powerpc/include/asm/Kbuild
> @@ -1,6 +1,7 @@
>
> generic-y += clkdev.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += mcs_spinlock.h
> generic-y += preempt.h
> generic-y += rwsem.h
> diff --git a/arch/s390/include/asm/Kbuild b/arch/s390/include/asm/Kbuild
> index b3fea07..773f866 100644
> --- a/arch/s390/include/asm/Kbuild
> +++ b/arch/s390/include/asm/Kbuild
> @@ -2,6 +2,7 @@
>
> generic-y += clkdev.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += mcs_spinlock.h
> generic-y += preempt.h
> generic-y += scatterlist.h
> diff --git a/arch/score/include/asm/Kbuild b/arch/score/include/asm/Kbuild
> index aad2091..1909d2a 100644
> --- a/arch/score/include/asm/Kbuild
> +++ b/arch/score/include/asm/Kbuild
> @@ -6,6 +6,7 @@ generic-y += barrier.h
> generic-y += clkdev.h
> generic-y += cputime.h
> generic-y += hash.h
> +generic-y += irq_work.h
> generic-y += mcs_spinlock.h
> generic-y += preempt.h
> generic-y += scatterlist.h
> diff --git a/arch/sh/include/asm/Kbuild b/arch/sh/include/asm/Kbuild
> index c19e47d..5a6c9ac 100644
> --- a/arch/sh/include/asm/Kbuild
> +++ b/arch/sh/include/asm/Kbuild
> @@ -12,6 +12,7 @@ generic-y += hash.h
> generic-y += ioctl.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kvm_para.h
> generic-y += local.h
> generic-y += local64.h
> diff --git a/arch/sparc/include/asm/Kbuild b/arch/sparc/include/asm/Kbuild
> index cdd1b44..f5f94ce 100644
> --- a/arch/sparc/include/asm/Kbuild
> +++ b/arch/sparc/include/asm/Kbuild
> @@ -8,6 +8,7 @@ generic-y += emergency-restart.h
> generic-y += exec.h
> generic-y += hash.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += linkage.h
> generic-y += local.h
> generic-y += local64.h
> diff --git a/arch/tile/include/asm/Kbuild b/arch/tile/include/asm/Kbuild
> index 0aa5675..e6462b8 100644
> --- a/arch/tile/include/asm/Kbuild
> +++ b/arch/tile/include/asm/Kbuild
> @@ -17,6 +17,7 @@ generic-y += ioctl.h
> generic-y += ioctls.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += local.h
> generic-y += local64.h
> generic-y += mcs_spinlock.h
> diff --git a/arch/um/include/asm/Kbuild b/arch/um/include/asm/Kbuild
> index 7bd64aa..244b12c 100644
> --- a/arch/um/include/asm/Kbuild
> +++ b/arch/um/include/asm/Kbuild
> @@ -14,6 +14,7 @@ generic-y += hash.h
> generic-y += hw_irq.h
> generic-y += io.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += mcs_spinlock.h
> generic-y += mutex.h
> diff --git a/arch/unicore32/include/asm/Kbuild b/arch/unicore32/include/asm/Kbuild
> index 1e5fb87..5a2bb53 100644
> --- a/arch/unicore32/include/asm/Kbuild
> +++ b/arch/unicore32/include/asm/Kbuild
> @@ -22,6 +22,7 @@ generic-y += ioctl.h
> generic-y += ioctls.h
> generic-y += ipcbuf.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += kmap_types.h
> generic-y += local.h
> diff --git a/arch/x86/include/asm/Kbuild b/arch/x86/include/asm/Kbuild
> index 3bf000f..8fa909c 100644
> --- a/arch/x86/include/asm/Kbuild
> +++ b/arch/x86/include/asm/Kbuild
> @@ -7,5 +7,6 @@ genhdr-y += unistd_x32.h
> generic-y += clkdev.h
> generic-y += cputime.h
> generic-y += early_ioremap.h
> +generic-y += irq_work.h
> generic-y += mcs_spinlock.h
> generic-y += scatterlist.h
> diff --git a/arch/xtensa/include/asm/Kbuild b/arch/xtensa/include/asm/Kbuild
> index c3d20ba..105d389 100644
> --- a/arch/xtensa/include/asm/Kbuild
> +++ b/arch/xtensa/include/asm/Kbuild
> @@ -12,6 +12,7 @@ generic-y += hardirq.h
> generic-y += hash.h
> generic-y += ioctl.h
> generic-y += irq_regs.h
> +generic-y += irq_work.h
> generic-y += kdebug.h
> generic-y += kmap_types.h
> generic-y += kvm_para.h
> diff --git a/include/asm-generic/irq_work.h b/include/asm-generic/irq_work.h
> index e69de29..e962b41 100644
> --- a/include/asm-generic/irq_work.h
> +++ b/include/asm-generic/irq_work.h
> @@ -0,0 +1,10 @@
> +#ifndef __ASM_IRQ_WORK_H
> +#define __ASM_IRQ_WORK_H
> +
> +static inline bool arch_irq_work_interrupt(void)
> +{
> + return false;
> +}
> +
> +#undef /* __ASM_IRQ_WORK_H */
> +
--
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