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authorAndy Lutomirski <luto@kernel.org>2016-08-11 12:35:22 +0300
committerIngo Molnar <mingo@kernel.org>2016-08-24 13:11:41 +0300
commitb4a0f533e5976cb1a79f31d6152e1d322d79b7f1 (patch)
tree152db464039f7cfe9a450f870d5293128c9bc513 /firmware/WHENCE
parentba14a194a434ccc8f733e263ad2ce941e35e5787 (diff)
downloadlinux-b4a0f533e5976cb1a79f31d6152e1d322d79b7f1.tar.xz
dma-api: Teach the "DMA-from-stack" check about vmapped stacks
If we're using CONFIG_VMAP_STACK=y and we manage to point an sg entry at the stack, then either the sg page will be in highmem or sg_virt() will return the direct-map alias. In neither case will the existing check_for_stack() implementation realize that it's a stack page. Fix it by explicitly checking for stack pages. This has no effect by itself. It's broken out for ease of review. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: Arnd Bergmann <arnd@arndb.de> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/448460622731312298bf19dcbacb1606e75de7a9.1470907718.git.luto@kernel.org [ Minor edits. ] Signed-off-by: Ingo Molnar <mingo@kernel.org>
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