From: Davidlohr Bueso <d...@stgolabs.net>

This becomes quite straightforward with the mmrange in place.

Signed-off-by: Davidlohr Bueso <dbu...@suse.de>
---
 arch/sh/kernel/sys_sh.c            | 7 ++++---
 arch/sh/kernel/vsyscall/vsyscall.c | 5 +++--
 2 files changed, 7 insertions(+), 5 deletions(-)

diff --git a/arch/sh/kernel/sys_sh.c b/arch/sh/kernel/sys_sh.c
index 724911c59e7d..35b91b6c8d34 100644
--- a/arch/sh/kernel/sys_sh.c
+++ b/arch/sh/kernel/sys_sh.c
@@ -58,6 +58,7 @@ asmlinkage long sys_mmap2(unsigned long addr, unsigned long 
len,
 asmlinkage int sys_cacheflush(unsigned long addr, unsigned long len, int op)
 {
        struct vm_area_struct *vma;
+       DEFINE_RANGE_LOCK_FULL(mmrange);
 
        if ((op <= 0) || (op > (CACHEFLUSH_D_PURGE|CACHEFLUSH_I)))
                return -EINVAL;
@@ -69,10 +70,10 @@ asmlinkage int sys_cacheflush(unsigned long addr, unsigned 
long len, int op)
        if (addr + len < addr)
                return -EFAULT;
 
-       down_read(&current->mm->mmap_sem);
+       mm_read_lock(current->mm, &mmrange);
        vma = find_vma (current->mm, addr);
        if (vma == NULL || addr < vma->vm_start || addr + len > vma->vm_end) {
-               up_read(&current->mm->mmap_sem);
+               mm_read_unlock(current->mm, &mmrange);
                return -EFAULT;
        }
 
@@ -91,6 +92,6 @@ asmlinkage int sys_cacheflush(unsigned long addr, unsigned 
long len, int op)
        if (op & CACHEFLUSH_I)
                flush_icache_range(addr, addr+len);
 
-       up_read(&current->mm->mmap_sem);
+       mm_read_unlock(current->mm, &mmrange);
        return 0;
 }
diff --git a/arch/sh/kernel/vsyscall/vsyscall.c 
b/arch/sh/kernel/vsyscall/vsyscall.c
index cc0cc5b4ff18..17520e6b7783 100644
--- a/arch/sh/kernel/vsyscall/vsyscall.c
+++ b/arch/sh/kernel/vsyscall/vsyscall.c
@@ -63,8 +63,9 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, 
int uses_interp)
        struct mm_struct *mm = current->mm;
        unsigned long addr;
        int ret;
+       DEFINE_RANGE_LOCK_FULL(mmrange);
 
-       if (down_write_killable(&mm->mmap_sem))
+       if (mm_write_lock_killable(mm, &mmrange))
                return -EINTR;
 
        addr = get_unmapped_area(NULL, 0, PAGE_SIZE, 0, 0);
@@ -83,7 +84,7 @@ int arch_setup_additional_pages(struct linux_binprm *bprm, 
int uses_interp)
        current->mm->context.vdso = (void *)addr;
 
 up_fail:
-       up_write(&mm->mmap_sem);
+       mm_write_unlock(mm, &mmrange);
        return ret;
 }
 
-- 
2.13.6

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