x86/mm/mtrr: Use symbolic define as a retval for disabled MTRRs
authorToshi Kani <toshi.kani@hp.com>
Tue, 26 May 2015 08:28:07 +0000 (10:28 +0200)
committerIngo Molnar <mingo@kernel.org>
Wed, 27 May 2015 12:40:57 +0000 (14:40 +0200)
commit3d3ca416d9b0784cfcf244eeeba1bcaf421bc64d
tree2e7720065caaa8f92aa5d21b2e548f15b114ad21
parent9b3aca620883fc06636737c82a4d024b22182281
x86/mm/mtrr: Use symbolic define as a retval for disabled MTRRs

mtrr_type_lookup() returns verbatim 0xFF when MTRRs are
disabled. This patch defines MTRR_TYPE_INVALID to clarify the
meaning of this value, and documents its usage.

Document the return values of the kernel virtual address mapping
helpers pud_set_huge(), pmd_set_huge, pud_clear_huge() and
pmd_clear_huge().

There is no functional change in this patch.

Signed-off-by: Toshi Kani <toshi.kani@hp.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Andy Lutomirski <luto@amacapital.net>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Elliott@hp.com
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Luis R. Rodriguez <mcgrof@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: dave.hansen@intel.com
Cc: linux-mm <linux-mm@kvack.org>
Cc: pebolle@tiscali.nl
Link: http://lkml.kernel.org/r/1431714237-880-5-git-send-email-toshi.kani@hp.com
Link: http://lkml.kernel.org/r/1432628901-18044-5-git-send-email-bp@alien8.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
arch/x86/include/asm/mtrr.h
arch/x86/include/uapi/asm/mtrr.h
arch/x86/kernel/cpu/mtrr/generic.c
arch/x86/mm/pgtable.c