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authorSuresh Siddha <suresh.b.siddha@intel.com>2009-04-09 14:26:52 -0700
committerIngo Molnar <mingo@elte.hu>2009-04-10 13:55:48 +0200
commit0c3c8a18361a636069f5a5d9d0d0f9c2124e6b94 (patch)
treef981571c3778083924be8de03445fc4c9ee5624b /arch/x86/mm/pat.c
parentb6ff32d9aaeeeecf98f9a852d715569183585312 (diff)
downloadop-kernel-dev-0c3c8a18361a636069f5a5d9d0d0f9c2124e6b94.zip
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x86, PAT: Remove duplicate memtype reserve in devmem mmap
/dev/mem mmap code was doing memtype reserve/free for a while now. Recently we added memtype tracking in remap_pfn_range, and /dev/mem mmap uses it indirectly. So, we don't need seperate tracking in /dev/mem code any more. That means another ~100 lines of code removed :-). Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Signed-off-by: Venkatesh Pallipadi <venkatesh.pallipadi@intel.com> LKML-Reference: <20090409212709.085210000@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.c60
1 files changed, 2 insertions, 58 deletions
diff --git a/arch/x86/mm/pat.c b/arch/x86/mm/pat.c
index 8d3de95..cc5e0e2 100644
--- a/arch/x86/mm/pat.c
+++ b/arch/x86/mm/pat.c
@@ -536,9 +536,7 @@ static inline int range_is_allowed(unsigned long pfn, unsigned long size)
int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
unsigned long size, pgprot_t *vma_prot)
{
- u64 offset = ((u64) pfn) << PAGE_SHIFT;
- unsigned long flags = -1;
- int retval;
+ unsigned long flags = _PAGE_CACHE_WB;
if (!range_is_allowed(pfn, size))
return 0;
@@ -566,65 +564,11 @@ int phys_mem_access_prot_allowed(struct file *file, unsigned long pfn,
}
#endif
- /*
- * With O_SYNC, we can only take UC_MINUS mapping. Fail if we cannot.
- *
- * Without O_SYNC, we want to get
- * - WB for WB-able memory and no other conflicting mappings
- * - UC_MINUS for non-WB-able memory with no other conflicting mappings
- * - Inherit from confliting mappings otherwise
- */
- if (flags != -1) {
- retval = reserve_memtype(offset, offset + size, flags, NULL);
- } else {
- retval = reserve_memtype(offset, offset + size,
- _PAGE_CACHE_WB, &flags);
- }
-
- if (retval < 0)
- return 0;
-
- if (((pfn < max_low_pfn_mapped) ||
- (pfn >= (1UL<<(32 - PAGE_SHIFT)) && pfn < max_pfn_mapped)) &&
- ioremap_change_attr((unsigned long)__va(offset), size, flags) < 0) {
- free_memtype(offset, offset + size);
- printk(KERN_INFO
- "%s:%d /dev/mem ioremap_change_attr failed %s for %Lx-%Lx\n",
- current->comm, current->pid,
- cattr_name(flags),
- offset, (unsigned long long)(offset + size));
- return 0;
- }
-
*vma_prot = __pgprot((pgprot_val(*vma_prot) & ~_PAGE_CACHE_MASK) |
flags);
return 1;
}
-void map_devmem(unsigned long pfn, unsigned long size, pgprot_t vma_prot)
-{
- unsigned long want_flags = (pgprot_val(vma_prot) & _PAGE_CACHE_MASK);
- u64 addr = (u64)pfn << PAGE_SHIFT;
- unsigned long flags;
-
- reserve_memtype(addr, addr + size, want_flags, &flags);
- if (flags != want_flags) {
- printk(KERN_INFO
- "%s:%d /dev/mem expected mapping type %s for %Lx-%Lx, got %s\n",
- current->comm, current->pid,
- cattr_name(want_flags),
- addr, (unsigned long long)(addr + size),
- cattr_name(flags));
- }
-}
-
-void unmap_devmem(unsigned long pfn, unsigned long size, pgprot_t vma_prot)
-{
- u64 addr = (u64)pfn << PAGE_SHIFT;
-
- free_memtype(addr, addr + size);
-}
-
/*
* Change the memory type for the physial address range in kernel identity
* mapping space if that range is a part of identity map.
@@ -662,8 +606,8 @@ static int reserve_pfn_range(u64 paddr, unsigned long size, pgprot_t *vma_prot,
{
int is_ram = 0;
int ret;
- unsigned long flags;
unsigned long want_flags = (pgprot_val(*vma_prot) & _PAGE_CACHE_MASK);
+ unsigned long flags = want_flags;
is_ram = pat_pagerange_is_ram(paddr, paddr + size);
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