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authorBenjamin Herrenschmidt <benh@kernel.crashing.org>2007-06-04 15:15:35 +1000
committerPaul Mackerras <paulus@samba.org>2007-06-14 22:29:56 +1000
commitc19c03fc749147f565e807fa65f1729066800571 (patch)
treed5ba2eb6d43b5001c93c42523fc5b2431ef61664 /mm
parent3c8c90ab8810a8ebb38a5f1dde2595b750d5adff (diff)
[POWERPC] unmap_vm_area becomes unmap_kernel_range for the public
This makes unmap_vm_area static and a wrapper around a new exported unmap_kernel_range that takes an explicit range instead of a vm_area struct. This makes it more versatile for code that wants to play with kernel page tables outside of the standard vmalloc area. (One example is some rework of the PowerPC PCI IO space mapping code that depends on that patch and removes some code duplication and horrible abuse of forged struct vm_struct). Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org> Signed-off-by: Paul Mackerras <paulus@samba.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmalloc.c13
1 files changed, 9 insertions, 4 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index d3a9c5368257..ddf87145cc49 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -68,12 +68,12 @@ static inline void vunmap_pud_range(pgd_t *pgd, unsigned long addr,
} while (pud++, addr = next, addr != end);
}
-void unmap_vm_area(struct vm_struct *area)
+void unmap_kernel_range(unsigned long addr, unsigned long size)
{
pgd_t *pgd;
unsigned long next;
- unsigned long addr = (unsigned long) area->addr;
- unsigned long end = addr + area->size;
+ unsigned long start = addr;
+ unsigned long end = addr + size;
BUG_ON(addr >= end);
pgd = pgd_offset_k(addr);
@@ -84,7 +84,12 @@ void unmap_vm_area(struct vm_struct *area)
continue;
vunmap_pud_range(pgd, addr, next);
} while (pgd++, addr = next, addr != end);
- flush_tlb_kernel_range((unsigned long) area->addr, end);
+ flush_tlb_kernel_range(start, end);
+}
+
+static void unmap_vm_area(struct vm_struct *area)
+{
+ unmap_kernel_range((unsigned long)area->addr, area->size);
}
static int vmap_pte_range(pmd_t *pmd, unsigned long addr,