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powerpc/kmemleak: Do not scan the DART table

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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>
This commit is contained in:
Catalin Marinas 2014-06-13 09:44:21 +01:00 committed by Benjamin Herrenschmidt
parent aa83f3d897
commit a1d23d5c94
1 changed files with 5 additions and 0 deletions
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5
arch/powerpc/sysdev/dart_iommu.c
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@ -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);
}