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Message-ID: <20111215192559.GA28283@gate.ebshome.net> Date: Thu, 15 Dec 2011 11:25:59 -0800 From: Eugene Surovegin <ebs@...home.net> To: tj@...nel.org Cc: ptesarik@...e.cz, xiyou.wangcong@...il.com, linux-mm@...ck.org, linux-kernel@...r.kernel.org, vgoyal@...hat.com Subject: [PATCH] percpu: fix per_cpu_ptr_to_phys() handling of non-page-aligned addresses. per_cpu_ptr_to_phys() incorrectly rounds up its result for non-kmalloc case to the page boundary, which is bogus for any non-page-aligned address. This fixes the only in-tree user of this function - sysfs handler for per-cpu 'crash_notes' physical address. The manifestation of this bug is missing 'CORE' ELF notes in kdump. Signed-off-by: Eugene Surovegin <ebs@...home.net> --- mm/percpu.c | 6 ++++-- 1 files changed, 4 insertions(+), 2 deletions(-) diff --git a/mm/percpu.c b/mm/percpu.c index 3bb810a..716eb4a 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -1023,9 +1023,11 @@ phys_addr_t per_cpu_ptr_to_phys(void *addr) if (!is_vmalloc_addr(addr)) return __pa(addr); else - return page_to_phys(vmalloc_to_page(addr)); + return page_to_phys(vmalloc_to_page(addr)) + + offset_in_page(addr); } else - return page_to_phys(pcpu_addr_to_page(addr)); + return page_to_phys(pcpu_addr_to_page(addr)) + + offset_in_page(addr); } /** -- 1.7.5.1 -- 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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