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Message-Id: <E1QXBUZ-0004g0-RG@eag09.americas.sgi.com> Date: Thu, 16 Jun 2011 07:16:11 -0500 From: Cliff Wickman <cpw@....com> To: linux-kernel@...r.kernel.org Cc: mingo@...e.hu Subject: [PATCH 1/8 v3] x86, UV: smp_processor_id in a preemptable region From: Cliff Wickman <cpw@....com> Calling smp_processor_id() from within a preemptable region will issue a warning if DEBUG_PREEMPT is set. The calls to get_cpu()/put_cpu() bound the region where the return cpu number is actually used and make it non-preemptable. A DEBUG_PREEMPT warning is prevented. UV does not support cpu hotplug yet, but this is a step toward that ability. Diffed against 3.0.0-rc3 Signed-off-by: Cliff Wickman <cpw@....com> --- arch/x86/platform/uv/tlb_uv.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) Index: linux/arch/x86/platform/uv/tlb_uv.c =================================================================== --- linux.orig/arch/x86/platform/uv/tlb_uv.c +++ linux/arch/x86/platform/uv/tlb_uv.c @@ -1334,9 +1334,10 @@ static ssize_t tunables_write(struct fil instr[count] = '\0'; - bcp = &per_cpu(bau_control, smp_processor_id()); - + cpu = get_cpu(); + bcp = &per_cpu(bau_control, cpu); ret = parse_tunables_write(bcp, instr, count); + put_cpu(); if (ret) return ret; -- 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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