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Date: Tue, 22 Apr 2008 09:57:26 +0200 From: Jens Axboe <jens.axboe@...cle.com> To: linux-arch@...r.kernel.org, linux-kernel@...r.kernel.org Cc: npiggin@...e.de, torvalds@...ux-foundation.org Subject: [PATCH 0/11] Generic smp_call_function() and friends Hi, While working on the more scalable and faster smp_call_function_single(), the amount of arch duplicated code in there botherered me. So I started adding a generic kernel/smp.c helper that the archs could use instead. Arch code exports two helper functions: arch_send_call_function_single_ipi(cpu) Send call function single ipi to given cpu arch_send_call_function_ipi(cpumask) Send call function ipi to cpus in cpumask and then use the generic ipi interrupt helpers to execute the code. I converted most of the archs capable of SMP, I think only sparc and sparc64 are still missing. Archs set CONFIG_GENERIC_SMP_HELPERS if they wish to use the generic helpers for this. The end result is that we have unified code for handling ipi for function calls. Even with adding special handling for the single cpu function call, the diffstat is pretty nice (see below. There are a couple of changes that affect all archs, and changes that affect some archs: - smp_call_function() and friends used to wait for all other CPUs to see the individual structure before returning, even if 'wait' wasn't set. Not sure what the reasoning behind this was, the new code does not wait for other CPUs to start up before returning. If 'wait' is 1, it'll wait for completion as before of course. This affects all archs. It's easy enough to add if there's a good reason, it'll slow it down a little and add an atomic_t to the call_single_data structure. - A few archs had timeout code, most did not. I removed the timeout code, we can add it back if requested. - The ipi_lock is a little muddy, which may or may not break cpu onlining. In general the new code should be easier to maintain, and it is much faster than before. The code works fine on x86, x86-64, ia64, and powerpc. Other archs have been compiled whenever possible, some have not. Each arch patch should contain a note saying what the status of it is. arch/alpha/Kconfig | 5 arch/alpha/kernel/core_marvel.c | 6 arch/alpha/kernel/smp.c | 170 --------- arch/arm/Kconfig | 5 arch/arm/kernel/smp.c | 148 -------- arch/ia64/Kconfig | 5 arch/ia64/kernel/smp.c | 239 ------------- arch/m32r/Kconfig | 5 arch/m32r/kernel/smp.c | 128 ------- arch/m32r/kernel/traps.c | 3 arch/mips/Kconfig | 5 arch/mips/kernel/smp-mt.c | 27 + arch/mips/kernel/smp.c | 133 ------- arch/mips/kernel/smtc.c | 7 arch/mips/sibyte/bcm1480/smp.c | 3 arch/mips/sibyte/sb1250/smp.c | 2 arch/parisc/Kconfig | 5 arch/parisc/kernel/smp.c | 134 +------ arch/powerpc/Kconfig | 5 arch/powerpc/kernel/smp.c | 220 ------------ arch/powerpc/platforms/cell/interrupt.c | 1 arch/powerpc/platforms/ps3/smp.c | 7 arch/powerpc/platforms/pseries/xics.c | 6 arch/powerpc/sysdev/mpic.c | 2 arch/s390/Kconfig | 5 arch/s390/kernel/smp.c | 160 --------- arch/sh/Kconfig | 5 arch/sh/kernel/smp.c | 48 -- arch/sparc64/kernel/sparc64_ksyms.c | 1 arch/x86/Kconfig | 5 arch/x86/kernel/apic_32.c | 4 arch/x86/kernel/entry_64.S | 3 arch/x86/kernel/i8259_64.c | 4 arch/x86/kernel/smp.c | 148 +------- arch/x86/kernel/smpcommon.c | 56 --- arch/x86/mach-voyager/voyager_smp.c | 91 ----- arch/x86/xen/enlighten.c | 1 arch/x86/xen/mmu.c | 2 arch/x86/xen/smp.c | 108 +----- include/asm-alpha/smp.h | 2 include/asm-ia64/smp.h | 3 include/asm-m32r/smp.h | 1 include/asm-mips/smp.h | 12 include/asm-powerpc/smp.h | 5 include/asm-s390/sigp.h | 1 include/asm-s390/smp.h | 2 include/asm-sh/smp.h | 12 include/asm-x86/hw_irq_32.h | 1 include/asm-x86/hw_irq_64.h | 2 include/asm-x86/mach-default/entry_arch.h | 1 include/asm-x86/mach-default/irq_vectors.h | 1 include/asm-x86/mach-voyager/entry_arch.h | 2 include/asm-x86/mach-voyager/irq_vectors.h | 4 include/asm-x86/smp.h | 10 include/linux/smp.h | 27 + init/main.c | 3 kernel/Makefile | 1 kernel/smp.c | 366 +++++++++++++++++++++ 58 files changed, 694 insertions(+), 1674 deletions(-) -- Jens Axboe -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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