diff options
| author | Michel Lespinasse <walken@google.com> | 2013-02-22 16:32:47 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2013-02-23 17:50:11 -0800 |
| commit | 41badc15cbad0350de34408c1b0c690f9df76d4b (patch) | |
| tree | 2545134398b99b37259bf6412a0bb56442f120fa | |
| parent | 1869305009857cdeaabe6283bcdc2359c5784543 (diff) | |
mm: make do_mmap_pgoff return populate as a size in bytes, not as a bool
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 <walken@google.com>
Acked-by: Rik van Riel <riel@redhat.com>
Tested-by: Andy Lutomirski <luto@amacapital.net>
Cc: Greg Ungerer <gregungerer@westnet.com.au>
Cc: David Howells <dhowells@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
| -rw-r--r-- | fs/aio.c | 5 | ||||
| -rw-r--r-- | include/linux/mm.h | 2 | ||||
| -rw-r--r-- | ipc/shm.c | 4 | ||||
| -rw-r--r-- | mm/mmap.c | 6 | ||||
| -rw-r--r-- | mm/nommu.c | 4 | ||||
| -rw-r--r-- | mm/util.c | 6 |
6 files changed, 13 insertions, 14 deletions
@@ -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; diff --git a/include/linux/mm.h b/include/linux/mm.h index 9a5fcdeaa3a0..95db68e34b18 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -1475,7 +1475,7 @@ extern unsigned long mmap_region(struct file *file, unsigned long addr, unsigned long len, vm_flags_t vm_flags, unsigned long pgoff); extern unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, - unsigned long pgoff, bool *populate); + unsigned long pgoff, unsigned long *populate); extern int do_munmap(struct mm_struct *, unsigned long, size_t); #ifdef CONFIG_MMU diff --git a/ipc/shm.c b/ipc/shm.c index 9f047ba69e62..be3ec9ae454e 100644 --- a/ipc/shm.c +++ b/ipc/shm.c @@ -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(¤t->mm->mmap_sem); if (populate) - mm_populate(addr, size); + mm_populate(addr, populate); out_fput: fput(file); diff --git a/mm/mmap.c b/mm/mmap.c index 39a3944e1658..44bb4d869884 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -1163,13 +1163,13 @@ static inline unsigned long round_hint_to_min(unsigned long hint) unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, unsigned long len, unsigned long prot, unsigned long flags, unsigned long pgoff, - bool *populate) + unsigned long *populate) { struct mm_struct * mm = current->mm; struct inode *inode; vm_flags_t vm_flags; - *populate = false; + *populate = 0; /* * Does the application expect PROT_READ to imply PROT_EXEC? @@ -1307,7 +1307,7 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long addr, addr = mmap_region(file, addr, len, vm_flags, pgoff); if (!IS_ERR_VALUE(addr) && (vm_flags & VM_POPULATE)) - *populate = true; + *populate = len; return addr; } diff --git a/mm/nommu.c b/mm/nommu.c index 7296a5a280e7..18c1b932e2c4 100644 --- a/mm/nommu.c +++ b/mm/nommu.c @@ -1251,7 +1251,7 @@ unsigned long do_mmap_pgoff(struct file *file, unsigned long prot, unsigned long flags, unsigned long pgoff, - bool *populate) + unsigned long *populate) { struct vm_area_struct *vma; struct vm_region *region; @@ -1261,7 +1261,7 @@ unsigned long do_mmap_pgoff(struct file *file, kenter(",%lx,%lx,%lx,%lx,%lx", addr, len, prot, flags, pgoff); - *populate = false; + *populate = 0; /* decide whether we should attempt the mapping, and if so what sort of * mapping */ diff --git a/mm/util.c b/mm/util.c index 13467e043e9e..3704bf1bef94 100644 --- a/mm/util.c +++ b/mm/util.c @@ -355,7 +355,7 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr, { unsigned long ret; struct mm_struct *mm = current->mm; - bool populate; + unsigned long populate; ret = security_mmap_file(file, prot, flag); if (!ret) { @@ -363,8 +363,8 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr, ret = do_mmap_pgoff(file, addr, len, prot, flag, pgoff, &populate); up_write(&mm->mmap_sem); - if (!IS_ERR_VALUE(ret) && populate) - mm_populate(ret, len); + if (populate) + mm_populate(ret, populate); } return ret; } |