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Date: Mon, 29 Oct 2012 09:52:42 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Frederic Weisbecker <fweisbec@...il.com>
Cc: LKML <linux-kernel@...r.kernel.org>,
Peter Zijlstra <peterz@...radead.org>,
Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...nel.org>,
Andrew Morton <akpm@...ux-foundation.org>,
Paul Gortmaker <paul.gortmaker@...driver.com>
Subject: Re: [RFC PATCH 3/9] irq_work: Move irq_work_raise()
declaration/default definition to arch headers
On Mon, 2012-10-29 at 14:28 +0100, Frederic Weisbecker wrote:
> This optimization doesn't matter much. But this prepares the
> arch headers that we need to add a new API in order to detect
> when the arch can trigger self IPIs to implement the irq work.
>
> This is necessary later to make printk working in nohz CPUs.
>
> Signed-off-by: Frederic Weisbecker <fweisbec@...il.com>
> Cc: Peter Zijlstra <peterz@...radead.org>
> Cc: Thomas Gleixner <tglx@...utronix.de>
> Cc: Ingo Molnar <mingo@...nel.org>
> Cc: Andrew Morton <akpm@...ux-foundation.org>
> Cc: Steven Rostedt <rostedt@...dmis.org>
> Cc: Paul Gortmaker <paul.gortmaker@...driver.com>
> ---
> arch/alpha/include/asm/irq_work.h | 6 ++++++
> arch/arm/include/asm/irq_work.h | 1 +
> arch/arm64/include/asm/irq_work.h | 1 +
> arch/avr32/include/asm/irq_work.h | 1 +
> arch/blackfin/include/asm/irq_work.h | 1 +
> arch/c6x/include/asm/irq_work.h | 1 +
> arch/cris/include/asm/irq_work.h | 1 +
> arch/frv/include/asm/irq_work.h | 1 +
> arch/h8300/include/asm/irq_work.h | 1 +
> arch/hexagon/include/asm/irq_work.h | 1 +
> arch/ia64/include/asm/irq_work.h | 1 +
> arch/m32r/include/asm/irq_work.h | 1 +
> arch/m68k/include/asm/irq_work.h | 1 +
> arch/microblaze/include/asm/irq_work.h | 1 +
> arch/mips/include/asm/irq_work.h | 1 +
> arch/mn10300/include/asm/irq_work.h | 1 +
> arch/openrisc/include/asm/irq_work.h | 1 +
> arch/parisc/include/asm/irq_work.h | 1 +
> arch/powerpc/include/asm/irq_work.h | 6 ++++++
> arch/s390/include/asm/irq_work.h | 1 +
> arch/score/include/asm/irq_work.h | 1 +
> arch/sh/include/asm/irq_work.h | 1 +
> arch/sparc/include/asm/irq_work.h | 6 ++++++
> arch/tile/include/asm/irq_work.h | 1 +
> arch/um/include/asm/irq_work.h | 1 +
> arch/unicore32/include/asm/irq_work.h | 1 +
> arch/x86/include/asm/irq_work.h | 10 ++++++++++
> arch/x86/kernel/irq_work.c | 4 ++--
> arch/xtensa/include/asm/irq_work.h | 1 +
> include/asm-generic/irq_work.h | 9 +++++++++
> include/linux/irq_work.h | 1 +
> kernel/irq_work.c | 7 -------
> 32 files changed, 64 insertions(+), 9 deletions(-)
> create mode 100644 arch/alpha/include/asm/irq_work.h
> create mode 100644 arch/arm/include/asm/irq_work.h
> create mode 100644 arch/arm64/include/asm/irq_work.h
> create mode 100644 arch/avr32/include/asm/irq_work.h
> create mode 100644 arch/blackfin/include/asm/irq_work.h
> create mode 100644 arch/c6x/include/asm/irq_work.h
> create mode 100644 arch/cris/include/asm/irq_work.h
> create mode 100644 arch/frv/include/asm/irq_work.h
> create mode 100644 arch/h8300/include/asm/irq_work.h
> create mode 100644 arch/hexagon/include/asm/irq_work.h
> create mode 100644 arch/ia64/include/asm/irq_work.h
> create mode 100644 arch/m32r/include/asm/irq_work.h
> create mode 100644 arch/m68k/include/asm/irq_work.h
> create mode 100644 arch/microblaze/include/asm/irq_work.h
> create mode 100644 arch/mips/include/asm/irq_work.h
> create mode 100644 arch/mn10300/include/asm/irq_work.h
> create mode 100644 arch/openrisc/include/asm/irq_work.h
> create mode 100644 arch/parisc/include/asm/irq_work.h
> create mode 100644 arch/powerpc/include/asm/irq_work.h
> create mode 100644 arch/s390/include/asm/irq_work.h
> create mode 100644 arch/score/include/asm/irq_work.h
> create mode 100644 arch/sh/include/asm/irq_work.h
> create mode 100644 arch/sparc/include/asm/irq_work.h
> create mode 100644 arch/tile/include/asm/irq_work.h
> create mode 100644 arch/um/include/asm/irq_work.h
> create mode 100644 arch/unicore32/include/asm/irq_work.h
> create mode 100644 arch/x86/include/asm/irq_work.h
> create mode 100644 arch/xtensa/include/asm/irq_work.h
> create mode 100644 include/asm-generic/irq_work.h
>
> diff --git a/arch/alpha/include/asm/irq_work.h b/arch/alpha/include/asm/irq_work.h
> new file mode 100644
> index 0000000..814ff3d
> --- /dev/null
> +++ b/arch/alpha/include/asm/irq_work.h
> @@ -0,0 +1,6 @@
> +#ifndef _ALPHA_IRQ_WORK_H
> +#define _ALPHA_IRQ_WORK_H
> +
> +extern void arch_irq_work_raise(void);
> +
> +#endif
> diff --git a/arch/arm/include/asm/irq_work.h b/arch/arm/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/arm/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
Don't add stub files. We don't do that anymore.
The correct way of doing this is to modify:
arch/*/include/asm/Kbuild
and add:
generic-y += irq_work.h
-- Steve
> diff --git a/arch/arm64/include/asm/irq_work.h b/arch/arm64/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/arm64/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/avr32/include/asm/irq_work.h b/arch/avr32/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/avr32/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/blackfin/include/asm/irq_work.h b/arch/blackfin/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/blackfin/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/c6x/include/asm/irq_work.h b/arch/c6x/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/c6x/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/cris/include/asm/irq_work.h b/arch/cris/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/cris/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/frv/include/asm/irq_work.h b/arch/frv/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/frv/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/h8300/include/asm/irq_work.h b/arch/h8300/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/h8300/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/hexagon/include/asm/irq_work.h b/arch/hexagon/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/hexagon/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/ia64/include/asm/irq_work.h b/arch/ia64/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/ia64/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/m32r/include/asm/irq_work.h b/arch/m32r/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/m32r/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/m68k/include/asm/irq_work.h b/arch/m68k/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/m68k/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/microblaze/include/asm/irq_work.h b/arch/microblaze/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/microblaze/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/mips/include/asm/irq_work.h b/arch/mips/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/mips/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/mn10300/include/asm/irq_work.h b/arch/mn10300/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/mn10300/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/openrisc/include/asm/irq_work.h b/arch/openrisc/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/openrisc/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/parisc/include/asm/irq_work.h b/arch/parisc/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/parisc/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/powerpc/include/asm/irq_work.h b/arch/powerpc/include/asm/irq_work.h
> new file mode 100644
> index 0000000..8b9927f
> --- /dev/null
> +++ b/arch/powerpc/include/asm/irq_work.h
> @@ -0,0 +1,6 @@
> +#ifndef _ASM_POWERPC_IRQ_WORK_H
> +#define _ASM_POWERPC_IRQ_WORK_H
> +
> +extern void arch_irq_work_raise(void);
> +
> +#endif
> diff --git a/arch/s390/include/asm/irq_work.h b/arch/s390/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/s390/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/score/include/asm/irq_work.h b/arch/score/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/score/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/sh/include/asm/irq_work.h b/arch/sh/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/sh/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/sparc/include/asm/irq_work.h b/arch/sparc/include/asm/irq_work.h
> new file mode 100644
> index 0000000..1d062a6
> --- /dev/null
> +++ b/arch/sparc/include/asm/irq_work.h
> @@ -0,0 +1,6 @@
> +#ifndef ___ASM_SPARC_IRQ_H
> +#define ___ASM_SPARC_IRQ_H
> +
> +extern void arch_irq_work_raise(void);
> +
> +#endif
> diff --git a/arch/tile/include/asm/irq_work.h b/arch/tile/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/tile/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/um/include/asm/irq_work.h b/arch/um/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/um/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/unicore32/include/asm/irq_work.h b/arch/unicore32/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/unicore32/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/arch/x86/include/asm/irq_work.h b/arch/x86/include/asm/irq_work.h
> new file mode 100644
> index 0000000..38eed96
> --- /dev/null
> +++ b/arch/x86/include/asm/irq_work.h
> @@ -0,0 +1,10 @@
> +#ifndef _ASM_X86_IRQ_WORK_H
> +#define _ASM_X86_IRQ_WORK_H
> +
> +#ifndef CONFIG_X86_LOCAL_APIC
> +#include <asm-generic/irq_work.h>
> +# else
> +extern void arch_irq_work_raise(void);
> +#endif
> +
> +#endif
> diff --git a/arch/x86/kernel/irq_work.c b/arch/x86/kernel/irq_work.c
> index ca8f703..95f5d4e 100644
> --- a/arch/x86/kernel/irq_work.c
> +++ b/arch/x86/kernel/irq_work.c
> @@ -18,13 +18,13 @@ void smp_irq_work_interrupt(struct pt_regs *regs)
> irq_exit();
> }
>
> +#ifdef CONFIG_X86_LOCAL_APIC
> void arch_irq_work_raise(void)
> {
> -#ifdef CONFIG_X86_LOCAL_APIC
> if (!cpu_has_apic)
> return;
>
> apic->send_IPI_self(IRQ_WORK_VECTOR);
> apic_wait_icr_idle();
> -#endif
> }
> +#endif
> diff --git a/arch/xtensa/include/asm/irq_work.h b/arch/xtensa/include/asm/irq_work.h
> new file mode 100644
> index 0000000..f1bffa2
> --- /dev/null
> +++ b/arch/xtensa/include/asm/irq_work.h
> @@ -0,0 +1 @@
> +#include <asm-generic/irq_work.h>
> diff --git a/include/asm-generic/irq_work.h b/include/asm-generic/irq_work.h
> new file mode 100644
> index 0000000..a2d4108
> --- /dev/null
> +++ b/include/asm-generic/irq_work.h
> @@ -0,0 +1,9 @@
> +#ifndef __ASM_GENERIC_ATOMIC_H
> +#define __ASM_GENERIC_ATOMIC_H
> +
> +/*
> + * Lame architectures will get the timer tick callback
> + */
> +static inline void arch_irq_work_raise(void) { }
> +
> +#endif
> diff --git a/include/linux/irq_work.h b/include/linux/irq_work.h
> index 6a9e8f5..b39ea0b 100644
> --- a/include/linux/irq_work.h
> +++ b/include/linux/irq_work.h
> @@ -2,6 +2,7 @@
> #define _LINUX_IRQ_WORK_H
>
> #include <linux/llist.h>
> +#include <asm/irq_work.h>
>
> struct irq_work {
> unsigned long flags;
> diff --git a/kernel/irq_work.c b/kernel/irq_work.c
> index 679c13e..d00011c 100644
> --- a/kernel/irq_work.c
> +++ b/kernel/irq_work.c
> @@ -56,13 +56,6 @@ static bool irq_work_claim(struct irq_work *work)
> return true;
> }
>
> -void __weak arch_irq_work_raise(void)
> -{
> - /*
> - * Lame architectures will get the timer tick callback
> - */
> -}
> -
> /*
> * Queue the entry and raise the IPI if needed.
> */
--
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