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authorLinus Torvalds <torvalds@linux-foundation.org>2012-04-20 15:35:40 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-20 17:28:17 -0700
commite4eb1ff61b323d6141614e5458a1f53c7046ff8e (patch)
tree7a0251509c169b0df1a6bf4bc47c5bca709e06da /fs
parent3b422e9c2c020a1137349c614da7f9c9761a0922 (diff)
downloadlinux-linaro-stable-e4eb1ff61b323d6141614e5458a1f53c7046ff8e.tar.gz
VM: add "vm_brk()" helper function
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>
Diffstat (limited to 'fs')
-rw-r--r--fs/binfmt_aout.c20
-rw-r--r--fs/binfmt_elf.c15
2 files changed, 9 insertions, 26 deletions
diff --git a/fs/binfmt_aout.c b/fs/binfmt_aout.c
index 2eb12f13593d..88527492b917 100644
--- a/fs/binfmt_aout.c
+++ b/fs/binfmt_aout.c
@@ -50,9 +50,7 @@ static int set_brk(unsigned long start, unsigned long end)
end = PAGE_ALIGN(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;
}
@@ -280,9 +278,7 @@ static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
pos = 32;
map_size = ex.a_text+ex.a_data;
#endif
- down_write(&current->mm->mmap_sem);
- error = do_brk(text_addr & PAGE_MASK, map_size);
- up_write(&current->mm->mmap_sem);
+ error = vm_brk(text_addr & PAGE_MASK, map_size);
if (error != (text_addr & PAGE_MASK)) {
send_sig(SIGKILL, current, 0);
return error;
@@ -313,9 +309,7 @@ static int load_aout_binary(struct linux_binprm * bprm, struct pt_regs * regs)
if (!bprm->file->f_op->mmap||((fd_offset & ~PAGE_MASK) != 0)) {
loff_t pos = fd_offset;
- down_write(&current->mm->mmap_sem);
- do_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
- up_write(&current->mm->mmap_sem);
+ vm_brk(N_TXTADDR(ex), ex.a_text+ex.a_data);
bprm->file->f_op->read(bprm->file,
(char __user *)N_TXTADDR(ex),
ex.a_text+ex.a_data, &pos);
@@ -412,9 +406,7 @@ static int load_aout_library(struct file *file)
"N_TXTOFF is not page aligned. Please convert library: %s\n",
file->f_path.dentry->d_name.name);
}
- down_write(&current->mm->mmap_sem);
- do_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
- up_write(&current->mm->mmap_sem);
+ vm_brk(start_addr, ex.a_text + ex.a_data + ex.a_bss);
file->f_op->read(file, (char __user *)start_addr,
ex.a_text + ex.a_data, &pos);
@@ -438,9 +430,7 @@ static int load_aout_library(struct file *file)
len = PAGE_ALIGN(ex.a_text + ex.a_data);
bss = ex.a_text + ex.a_data + ex.a_bss;
if (bss > len) {
- down_write(&current->mm->mmap_sem);
- error = do_brk(start_addr + len, bss - len);
- up_write(&current->mm->mmap_sem);
+ error = vm_brk(start_addr + len, bss - len);
retval = error;
if (error != start_addr + len)
goto out;
diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 48ffb3dc610a..0708a0bf0ba9 100644
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -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: