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@xxxxxxxxxxx> --- 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, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/ Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>