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-rw-r--r--mm/util.c12
1 files changed, 9 insertions, 3 deletions
diff --git a/mm/util.c b/mm/util.c
index 8a1b3a1..03b2377 100644
--- a/mm/util.c
+++ b/mm/util.c
@@ -289,7 +289,7 @@ EXPORT_SYMBOL_GPL(get_user_pages_fast);
unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
- unsigned long flag, unsigned long pgoff)
+ unsigned long flag, unsigned long pgoff, bool killable)
{
unsigned long ret;
struct mm_struct *mm = current->mm;
@@ -297,7 +297,12 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
ret = security_mmap_file(file, prot, flag);
if (!ret) {
- down_write(&mm->mmap_sem);
+ if (killable) {
+ if (down_write_killable(&mm->mmap_sem))
+ return -EINTR;
+ } else {
+ down_write(&mm->mmap_sem);
+ }
ret = do_mmap_pgoff(file, addr, len, prot, flag, pgoff,
&populate);
up_write(&mm->mmap_sem);
@@ -307,6 +312,7 @@ unsigned long vm_mmap_pgoff(struct file *file, unsigned long addr,
return ret;
}
+/* XXX are all callers checking an error */
unsigned long vm_mmap(struct file *file, unsigned long addr,
unsigned long len, unsigned long prot,
unsigned long flag, unsigned long offset)
@@ -316,7 +322,7 @@ unsigned long vm_mmap(struct file *file, unsigned long addr,
if (unlikely(offset_in_page(offset)))
return -EINVAL;
- return vm_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT);
+ return vm_mmap_pgoff(file, addr, len, prot, flag, offset >> PAGE_SHIFT, false);
}
EXPORT_SYMBOL(vm_mmap);
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