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

Browse source 
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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4
ipc/shm.c
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@ -971,7 +971,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
struct shm_file_data *sfd;
struct path path;
fmode_t f_mode;
bool populate = false;
unsigned long populate = 0;
err = -EINVAL;
if (shmid < 0)
@ -1078,7 +1078,7 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
invalid:
up_write(&current->mm->mmap_sem);
if (populate)
mm_populate(addr, size);
mm_populate(addr, populate);
out_fput:
fput(file);