From a1d23d5c94256ffa0de510a3d59d6eff551d97ae Mon Sep 17 00:00:00 2001 From: Catalin Marinas <catalin.marinas@arm.com> Date: Fri, 13 Jun 2014 09:44:21 +0100 Subject: [PATCH] powerpc/kmemleak: Do not scan the DART table The DART table allocation is registered to kmemleak via the memblock_alloc_base() call. However, the DART table is later unmapped and dart_tablebase VA no longer accessible. This patch tells kmemleak not to scan this block and avoid an unhandled paging request. Signed-off-by: Catalin Marinas <catalin.marinas@arm.com> Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org> Cc: Paul Mackerras <paulus@samba.org> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> --- arch/powerpc/sysdev/dart_iommu.c | 5 +++++ 1 file changed, 5 insertions(+) diff --git a/arch/powerpc/sysdev/dart_iommu.c b/arch/powerpc/sysdev/dart_iommu.c index 62c47bb765178a..9e5353ff6d1bb9 100644 --- a/arch/powerpc/sysdev/dart_iommu.c +++ b/arch/powerpc/sysdev/dart_iommu.c @@ -476,6 +476,11 @@ void __init alloc_dart_table(void) */ dart_tablebase = (unsigned long) __va(memblock_alloc_base(1UL<<24, 1UL<<24, 0x80000000L)); + /* + * The DART space is later unmapped from the kernel linear mapping and + * accessing dart_tablebase during kmemleak scanning will fault. + */ + kmemleak_no_scan((void *)dart_tablebase); printk(KERN_INFO "DART table allocated at: %lx\n", dart_tablebase); } -- GitLab