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Date: Fri, 16 Dec 2011 09:04:23 +0100 From: Petr Tesarik <ptesarik@...e.cz> To: Tejun Heo <tj@...nel.org>, linux-mm@...ck.org Cc: LKML <linux-kernel@...r.kernel.org>, Vivek Goyal <vgoyal@...hat.com>, surovegin@...gle.com, gthelen@...gle.com Subject: [PATCH] Do not round per_cpu_ptr_to_phys to page boundary The phys_addr_t per_cpu_ptr_to_phys() function ignores the offset within a page, whenever not using a simple translation using __pa(). Without this patch /sys/devices/system/cpu/cpu*/crash_notes shows incorrect values, which breaks kdump. Other things may also be broken. Signed-off-by: Petr Tesarik <ptesarik@...e.cz> diff --git a/mm/percpu.c b/mm/percpu.c index 3bb810a..1a1b5ac 100644 --- a/mm/percpu.c +++ b/mm/percpu.c @@ -998,6 +998,7 @@ phys_addr_t per_cpu_ptr_to_phys(void *addr) bool in_first_chunk = false; unsigned long first_low, first_high; unsigned int cpu; + phys_addr_t page_addr; /* * The following test on unit_low/high isn't strictly @@ -1023,9 +1024,10 @@ 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)); + page_addr = page_to_phys(vmalloc_to_page(addr)); } else - return page_to_phys(pcpu_addr_to_page(addr)); + page_addr = page_to_phys(pcpu_addr_to_page(addr)); + return page_addr + offset_in_page(addr); } /** -- 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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