Merge tag 'samsung-fixes-4.7-2' of git://git.kernel.org/pub/scm/linux/kernel/git...

[cascardo/linux.git] / mm / mmap.c

diff --git a/mm/mmap.c b/mm/mmap.c
index b9274a0..de2c176 100644 (file)
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -168,7 +168,7 @@ static struct vm_area_struct *remove_vma(struct vm_area_struct *vma)
        return next;
 }
 
-static unsigned long do_brk(unsigned long addr, unsigned long len);
+static int do_brk(unsigned long addr, unsigned long len);
 
 SYSCALL_DEFINE1(brk, unsigned long, brk)
 {
@@ -178,7 +178,8 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
        unsigned long min_brk;
        bool populate;
 
-       down_write(&mm->mmap_sem);
+       if (down_write_killable(&mm->mmap_sem))
+               return -EINTR;
 
 #ifdef CONFIG_COMPAT_BRK
        /*
@@ -223,7 +224,7 @@ SYSCALL_DEFINE1(brk, unsigned long, brk)
                goto out;
 
        /* Ok, looks good - let it rip. */
-       if (do_brk(oldbrk, newbrk-oldbrk) != oldbrk)
+       if (do_brk(oldbrk, newbrk-oldbrk) < 0)
                goto out;
 
 set_brk:
@@ -2493,7 +2494,9 @@ int vm_munmap(unsigned long start, size_t len)
        int ret;
        struct mm_struct *mm = current->mm;
 
-       down_write(&mm->mmap_sem);
+       if (down_write_killable(&mm->mmap_sem))
+               return -EINTR;
+
        ret = do_munmap(mm, start, len);
        up_write(&mm->mmap_sem);
        return ret;
@@ -2502,8 +2505,15 @@ EXPORT_SYMBOL(vm_munmap);
 
 SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
 {
+       int ret;
+       struct mm_struct *mm = current->mm;
+
        profile_munmap(addr);
-       return vm_munmap(addr, len);
+       if (down_write_killable(&mm->mmap_sem))
+               return -EINTR;
+       ret = do_munmap(mm, addr, len);
+       up_write(&mm->mmap_sem);
+       return ret;
 }
 
 
@@ -2535,7 +2545,9 @@ SYSCALL_DEFINE5(remap_file_pages, unsigned long, start, unsigned long, size,
        if (pgoff + (size >> PAGE_SHIFT) < pgoff)
                return ret;
 
-       down_write(&mm->mmap_sem);
+       if (down_write_killable(&mm->mmap_sem))
+               return -EINTR;
+
        vma = find_vma(mm, start);
 
        if (!vma || !(vma->vm_flags & VM_SHARED))
@@ -2613,7 +2625,7 @@ static inline void verify_mm_writelocked(struct mm_struct *mm)
  *  anonymous maps.  eventually we may be able to do some
  *  brk-specific accounting here.
  */
-static unsigned long do_brk(unsigned long addr, unsigned long len)
+static int do_brk(unsigned long addr, unsigned long len)
 {
        struct mm_struct *mm = current->mm;
        struct vm_area_struct *vma, *prev;
@@ -2624,7 +2636,7 @@ static unsigned long do_brk(unsigned long addr, unsigned long len)
 
        len = PAGE_ALIGN(len);
        if (!len)
-               return addr;
+               return 0;
 
        flags = VM_DATA_DEFAULT_FLAGS | VM_ACCOUNT | mm->def_flags;
 
@@ -2691,20 +2703,22 @@ out:
        if (flags & VM_LOCKED)
                mm->locked_vm += (len >> PAGE_SHIFT);
        vma->vm_flags |= VM_SOFTDIRTY;
-       return addr;
+       return 0;
 }
 
-unsigned long vm_brk(unsigned long addr, unsigned long len)
+int vm_brk(unsigned long addr, unsigned long len)
 {
        struct mm_struct *mm = current->mm;
-       unsigned long ret;
+       int ret;
        bool populate;
 
-       down_write(&mm->mmap_sem);
+       if (down_write_killable(&mm->mmap_sem))
+               return -EINTR;
+
        ret = do_brk(addr, len);
        populate = ((mm->def_flags & VM_LOCKED) != 0);
        up_write(&mm->mmap_sem);
-       if (populate)
+       if (populate && !ret)
                mm_populate(addr, len);
        return ret;
 }