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Commit a1d23d5c authored by Catalin Marinas's avatar Catalin Marinas Committed by Benjamin Herrenschmidt
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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: default avatarCatalin Marinas <catalin.marinas@arm.com>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent aa83f3d8

arch/powerpc/sysdev/dart_iommu.c

+5 −0
Original line number Original line Diff line number Diff line
@@ -476,6 +476,11 @@ void __init alloc_dart_table(void) 
	 */

	 */

	dart_tablebase = (unsigned long)

	dart_tablebase = (unsigned long)

		__va(memblock_alloc_base(1UL<<24, 1UL<<24, 0x80000000L));

		__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);

	printk(KERN_INFO "DART table allocated at: %lx\n", dart_tablebase);

}
 
}