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mm: make do_mmap_pgoff return populate as a size in bytes, not as a bool

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do_mmap_pgoff() rounds up the desired size to the next PAGE_SIZE
multiple, however there was no equivalent code in mm_populate(), which
caused issues.

This could be fixed by introduced the same rounding in mm_populate(),
however I think it's preferable to make do_mmap_pgoff() return populate
as a size rather than as a boolean, so we don't have to duplicate the
size rounding logic in mm_populate().

Signed-off-by: Michel Lespinasse <[email protected]>
Acked-by: Rik van Riel <[email protected]>
Tested-by: Andy Lutomirski <[email protected]>
Cc: Greg Ungerer <[email protected]>
Cc: David Howells <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Michel Lespinasse 2013-02-22 16:32:47 -08:00 • committed by Linus Torvalds
commit 41badc15cb
6 changed files with 13 additions and 14 deletions
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5
fs/aio.c
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@ -101,9 +101,8 @@ static int aio_setup_ring(struct kioctx *ctx)
struct aio_ring *ring;
struct aio_ring_info *info = &ctx->ring_info;
unsigned nr_events = ctx->max_reqs;
unsigned long size;
unsigned long size, populate;
int nr_pages;
bool populate;
/* Compensate for the ring buffer's head/tail overlap entry */
nr_events += 2; /* 1 is required, 2 for good luck */
@ -150,7 +149,7 @@ static int aio_setup_ring(struct kioctx *ctx)
return -EAGAIN;
}
if (populate)
mm_populate(info->mmap_base, info->mmap_size);
mm_populate(info->mmap_base, populate);
ctx->user_id = info->mmap_base;