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VM: add "vm_brk()" helper function

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It does the same thing as "do_brk()", except it handles the VM locking
too.

It turns out that all external callers want that anyway, so we can make
do_brk() static to just mm/mmap.c while at it.

Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Linus Torvalds 2012-04-20 15:35:40 -07:00
parent 3b422e9c2c
commit e4eb1ff61b
6 changed files with 31 additions and 45 deletions
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15
fs/binfmt_elf.c
View file

@ -82,9 +82,7 @@ static int set_brk(unsigned long start, unsigned long end)
end = ELF_PAGEALIGN(end);
if (end > start) {
unsigned long addr;
down_write(&current->mm->mmap_sem);
addr = do_brk(start, end - start);
up_write(&current->mm->mmap_sem);
addr = vm_brk(start, end - start);
if (BAD_ADDR(addr))
return addr;
}
@ -514,9 +512,7 @@ static unsigned long load_elf_interp(struct elfhdr *interp_elf_ex,
elf_bss = ELF_PAGESTART(elf_bss + ELF_MIN_ALIGN - 1);
/* Map the last of the bss segment */
down_write(&current->mm->mmap_sem);
error = do_brk(elf_bss, last_bss - elf_bss);
up_write(&current->mm->mmap_sem);
error = vm_brk(elf_bss, last_bss - elf_bss);
if (BAD_ADDR(error))
goto out_close;
}
@ -1072,11 +1068,8 @@ static int load_elf_library(struct file *file)
len = ELF_PAGESTART(eppnt->p_filesz + eppnt->p_vaddr +
ELF_MIN_ALIGN - 1);
bss = eppnt->p_memsz + eppnt->p_vaddr;
if (bss > len) {
down_write(&current->mm->mmap_sem);
do_brk(len, bss - len);
up_write(&current->mm->mmap_sem);
}
if (bss > len)
vm_brk(len, bss - len);
error = 0;
out_free_ph: