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/[email protected]
Signed-off-by: Qian Cai <[email protected]>
Suggested-by: Andrew Morton <[email protected]>
Cc: Joerg Roedel <[email protected]>
Cc: Robin Murphy <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
1 file changed