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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 /drivers/lguest
parent21bda264f4243f61dfcc485174055f12ad0530b4 (diff)
downloadkernel-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 'drivers/lguest')
-rw-r--r--drivers/lguest/core.c7
1 files changed, 2 insertions, 5 deletions
diff --git a/drivers/lguest/core.c b/drivers/lguest/core.c
index 0bf1e4edf04d..6590558d1d31 100644
--- a/drivers/lguest/core.c
+++ b/drivers/lguest/core.c
@@ -42,7 +42,6 @@ DEFINE_MUTEX(lguest_lock);
static __init int map_switcher(void)
{
int i, err;
- struct page **pagep;
/*
* Map the Switcher in to high memory.
@@ -110,11 +109,9 @@ static __init int map_switcher(void)
* This code actually sets up the pages we've allocated to appear at
* switcher_addr. map_vm_area() takes the vma we allocated above, the
* kind of pages we're mapping (kernel pages), and a pointer to our
- * array of struct pages. It increments that pointer, but we don't
- * care.
+ * array of struct pages.
*/
- pagep = lg_switcher_pages;
- err = map_vm_area(switcher_vma, PAGE_KERNEL_EXEC, &pagep);
+ err = map_vm_area(switcher_vma, PAGE_KERNEL_EXEC, lg_switcher_pages);
if (err) {
printk("lguest: map_vm_area failed: %i\n", err);
goto free_vma;