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Date: Thu, 23 Dec 2010 11:21:10 +0100 From: Peter Zijlstra <a.p.zijlstra@...llo.nl> To: Cong Wang <amwang@...hat.com> Cc: linux-kernel@...r.kernel.org, David Howells <dhowells@...hat.com>, Koichi Yasutake <yasutake.koichi@...panasonic.com>, Thomas Gleixner <tglx@...utronix.de>, Ingo Molnar <mingo@...hat.com>, "H. Peter Anvin" <hpa@...or.com>, x86@...nel.org, Yinghai Lu <yinghai@...nel.org>, Tejun Heo <tj@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Jens Axboe <jaxboe@...ionio.com>, Heiko Carstens <heiko.carstens@...ibm.com>, Venkatesh Pallipadi <venki@...gle.com>, linux-am33-list@...hat.com Subject: Re: [PATCH] kernel: clean up USE_GENERIC_SMP_HELPERS On Thu, 2010-12-23 at 18:02 +0800, Cong Wang wrote: > 于 2010年12月22日 21:08, Peter Zijlstra 写道: > > On Mon, 2010-11-29 at 14:06 +0800, Amerigo Wang wrote: > >> For arch which needs USE_GENERIC_SMP_HELPERS, it has to > >> select USE_GENERIC_SMP_HELPERS, rather than leaving a choice > >> to user, since they don't provide their own implementions. > >> > > > >> config MN10300_CURRENT_IN_E2 > >> diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig > >> index e330da2..736beea 100644 > >> --- a/arch/x86/Kconfig > >> +++ b/arch/x86/Kconfig > >> @@ -65,6 +65,7 @@ config X86 > >> select HAVE_SPARSE_IRQ > >> select GENERIC_IRQ_PROBE > >> select GENERIC_PENDING_IRQ if SMP > >> + select USE_GENERIC_SMP_HELPERS if SMP > >> > >> config INSTRUCTION_DECODER > >> def_bool (KPROBES || PERF_EVENTS) > >> @@ -203,10 +204,6 @@ config HAVE_INTEL_TXT > >> def_bool y > >> depends on EXPERIMENTAL&& DMAR&& ACPI > >> > >> -config USE_GENERIC_SMP_HELPERS > >> - def_bool y > >> - depends on SMP > >> - > >> config X86_32_SMP > >> def_bool y > >> depends on X86_32&& SMP > > > > That changelog and the patch don't match, the patch is a total NOP, > > users never see that config option. > > Ok, but isn't 'select' is supposed to be better to express this here? :) It sure is shorter, so on that ground one can argue so indeed. Its just that the discrepancy between the Changelog (describing an actual change in semantics) and the patch (being a NOP) bothered me. > This patch also moves on_each_cpu() to kernel/smp.c, btw. Right, it does that, it would probably have been better if that were a patch on its own, seeing as its a completely orthogonal change. -- 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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