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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-20 17:13:58 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-04-20 17:29:13 -0700 |
| commit | 6be5ceb02e98eaf6cfc4f8b12a896d04023f340d (patch) | |
| tree | f34de1392300bbf63549f4eeb20f7606d6f7b1f9 /fs/binfmt_som.c | |
| parent | a46ef99d80817a167477ed1c8b4d90ee0c2e726f (diff) | |
| download | lwn-6be5ceb02e98eaf6cfc4f8b12a896d04023f340d.tar.gz lwn-6be5ceb02e98eaf6cfc4f8b12a896d04023f340d.zip | |
VM: add "vm_mmap()" helper function
This continues the theme started with vm_brk() and vm_munmap():
vm_mmap() does the same thing as do_mmap(), but additionally does the
required VM locking.
This uninlines (and rewrites it to be clearer) do_mmap(), which sadly
duplicates it in mm/mmap.c and mm/nommu.c. But that way we don't have
to export our internal do_mmap_pgoff() function.
Some day we hopefully don't have to export do_mmap() either, if all
modular users can become the simpler vm_mmap() instead. We're actually
very close to that already, with the notable exception of the (broken)
use in i810, and a couple of stragglers in binfmt_elf.
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/binfmt_som.c')
| -rw-r--r-- | fs/binfmt_som.c | 12 |
1 files changed, 3 insertions, 9 deletions
diff --git a/fs/binfmt_som.c b/fs/binfmt_som.c index e4fc746629a7..4517aaff61b4 100644 --- a/fs/binfmt_som.c +++ b/fs/binfmt_som.c @@ -147,10 +147,8 @@ static int map_som_binary(struct file *file, code_size = SOM_PAGEALIGN(hpuxhdr->exec_tsize); current->mm->start_code = code_start; current->mm->end_code = code_start + code_size; - down_write(¤t->mm->mmap_sem); - retval = do_mmap(file, code_start, code_size, prot, + retval = vm_mmap(file, code_start, code_size, prot, flags, SOM_PAGESTART(hpuxhdr->exec_tfile)); - up_write(¤t->mm->mmap_sem); if (retval < 0 && retval > -1024) goto out; @@ -158,20 +156,16 @@ static int map_som_binary(struct file *file, data_size = SOM_PAGEALIGN(hpuxhdr->exec_dsize); current->mm->start_data = data_start; current->mm->end_data = bss_start = data_start + data_size; - down_write(¤t->mm->mmap_sem); - retval = do_mmap(file, data_start, data_size, + retval = vm_mmap(file, data_start, data_size, prot | PROT_WRITE, flags, SOM_PAGESTART(hpuxhdr->exec_dfile)); - up_write(¤t->mm->mmap_sem); if (retval < 0 && retval > -1024) goto out; som_brk = bss_start + SOM_PAGEALIGN(hpuxhdr->exec_bsize); current->mm->start_brk = current->mm->brk = som_brk; - down_write(¤t->mm->mmap_sem); - retval = do_mmap(NULL, bss_start, som_brk - bss_start, + retval = vm_mmap(NULL, bss_start, som_brk - bss_start, prot | PROT_WRITE, MAP_FIXED | MAP_PRIVATE, 0); - up_write(¤t->mm->mmap_sem); if (retval > 0 || retval < -1024) retval = 0; out: |