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| author | Andreas Herrmann <andreas.herrmann3@amd.com> | 2008-06-20 22:03:06 +0200 |
|---|---|---|
| committer | Ingo Molnar <mingo@elte.hu> | 2008-06-24 13:05:50 +0200 |
| commit | 69e26be9b1d0c83d3581475095ce2a1ccc578215 (patch) | |
| tree | 986c70f4e9f73b924d30a83d517184d61661f5a1 /arch/x86/mm/pat.c | |
| parent | ac97991ec9e0a05c8860f4a04f8477227b1c03f2 (diff) | |
| download | linux-69e26be9b1d0c83d3581475095ce2a1ccc578215.tar.gz linux-69e26be9b1d0c83d3581475095ce2a1ccc578215.tar.bz2 linux-69e26be9b1d0c83d3581475095ce2a1ccc578215.zip | |
x86: pat.c more trivial changes
- add BUG statement to catch invalid start and end parameters
- No need to track the actual type in both req_type and actual_type --
keep req_type unchanged.
- removed (IMHO) superfluous comments
Signed-off-by: Andreas Herrmann <andreas.herrmann3@amd.com>
Cc: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com>
Cc: Suresh B Siddha <suresh.b.siddha@intel.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Diffstat (limited to 'arch/x86/mm/pat.c')
| -rw-r--r-- | arch/x86/mm/pat.c | 21 |
1 files changed, 8 insertions, 13 deletions
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c index a6507bfb12a7..c996a3641200 100644 --- a/arch/x86/mm/pat.c +++ b/arch/x86/mm/pat.c @@ -200,7 +200,8 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type, unsigned long actual_type; int err = 0; - /* Only track when pat_enabled */ + BUG_ON(start >= end); /* end is exclusive */ + if (!pat_enabled) { /* This is identical to page table setting without PAT */ if (new_type) { @@ -228,17 +229,13 @@ int reserve_memtype(u64 start, u64 end, unsigned long req_type, */ u8 mtrr_type = mtrr_type_lookup(start, end); - if (mtrr_type == MTRR_TYPE_WRBACK) { - req_type = _PAGE_CACHE_WB; + if (mtrr_type == MTRR_TYPE_WRBACK) actual_type = _PAGE_CACHE_WB; - } else { - req_type = _PAGE_CACHE_UC_MINUS; + else actual_type = _PAGE_CACHE_UC_MINUS; - } - } else { - req_type &= _PAGE_CACHE_MASK; - actual_type = pat_x_mtrr_type(start, end, req_type); - } + } else + actual_type = pat_x_mtrr_type(start, end, + req_type & _PAGE_CACHE_MASK); new = kmalloc(sizeof(struct memtype), GFP_KERNEL); if (!new) @@ -406,10 +403,8 @@ int free_memtype(u64 start, u64 end) struct memtype *entry; int err = -EINVAL; - /* Only track when pat_enabled */ - if (!pat_enabled) { + if (!pat_enabled) return 0; - } /* Low ISA region is always mapped WB. No need to track */ if (is_ISA_range(start, end - 1)) |