include/linux/dmar.h: replace single-char identifiers in macros
There are a few macros in IOMMU have single-char identifiers make the code
hard to read and debug. Replace them with meaningful names.
Link: http://lkml.kernel.org/r/1559566783-13627-1-git-send-email-cai@lca.pw
Signed-off-by: Qian Cai <cai@lca.pw>
Suggested-by: Andrew Morton <akpm@linux-foundation.org>
Cc: Joerg Roedel <jroedel@suse.de>
Cc: Robin Murphy <robin.murphy@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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