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authorWANG Chao <chaowang@redhat.com>2014-08-06 16:06:58 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2014-08-06 18:01:19 -0700
commitf6f8ed47353597dcb895eb4a15a28af657392e72 (patch)
treee74c51da4b21049b82d9b3fc537d28f713989801 /mm/vmalloc.c
parent21bda264f4243f61dfcc485174055f12ad0530b4 (diff)
downloadop-kernel-dev-f6f8ed47353597dcb895eb4a15a28af657392e72.zip
op-kernel-dev-f6f8ed47353597dcb895eb4a15a28af657392e72.tar.gz
mm/vmalloc.c: clean up map_vm_area third argument
Currently map_vm_area() takes (struct page *** pages) as third argument, and after mapping, it moves (*pages) to point to (*pages + nr_mappped_pages). It looks like this kind of increment is useless to its caller these days. The callers don't care about the increments and actually they're trying to avoid this by passing another copy to map_vm_area(). The caller can always guarantee all the pages can be mapped into vm_area as specified in first argument and the caller only cares about whether map_vm_area() fails or not. This patch cleans up the pointer movement in map_vm_area() and updates its callers accordingly. Signed-off-by: WANG Chao <chaowang@redhat.com> Cc: Zhang Yanfei <zhangyanfei@cn.fujitsu.com> Acked-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Minchan Kim <minchan@kernel.org> Cc: Nitin Gupta <ngupta@vflare.org> Cc: Rusty Russell <rusty@rustcorp.com.au> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/vmalloc.c')
-rw-r--r--mm/vmalloc.c14
1 files changed, 5 insertions, 9 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 9ec4173..2b0aa54 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -1270,19 +1270,15 @@ void unmap_kernel_range(unsigned long addr, unsigned long size)
}
EXPORT_SYMBOL_GPL(unmap_kernel_range);
-int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page ***pages)
+int map_vm_area(struct vm_struct *area, pgprot_t prot, struct page **pages)
{
unsigned long addr = (unsigned long)area->addr;
unsigned long end = addr + get_vm_area_size(area);
int err;
- err = vmap_page_range(addr, end, prot, *pages);
- if (err > 0) {
- *pages += err;
- err = 0;
- }
+ err = vmap_page_range(addr, end, prot, pages);
- return err;
+ return err > 0 ? 0 : err;
}
EXPORT_SYMBOL_GPL(map_vm_area);
@@ -1548,7 +1544,7 @@ void *vmap(struct page **pages, unsigned int count,
if (!area)
return NULL;
- if (map_vm_area(area, prot, &pages)) {
+ if (map_vm_area(area, prot, pages)) {
vunmap(area->addr);
return NULL;
}
@@ -1606,7 +1602,7 @@ static void *__vmalloc_area_node(struct vm_struct *area, gfp_t gfp_mask,
cond_resched();
}
- if (map_vm_area(area, prot, &pages))
+ if (map_vm_area(area, prot, pages))
goto fail;
return area->addr;
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