kill mm argument of vm_munmap()

it's always current->mm
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

arch/ia64/kernel/perfmon.c

@@ -1468,7 +1468,7 @@ pfm_remove_smpl_mapping(void *vaddr, unsigned long size)
 	/*
 	 * does the actual unmapping
 	 */
-	r = vm_munmap(current->mm, (unsigned long)vaddr, size);
+	r = vm_munmap((unsigned long)vaddr, size);
 
 	if (r !=0) {
 		printk(KERN_ERR "perfmon: [%d] unable to unmap sampling buffer @%p size=%lu\n", task_pid_nr(task), vaddr, size);

arch/sparc/kernel/sys_sparc_64.c

@@ -569,7 +569,7 @@ SYSCALL_DEFINE2(64_munmap, unsigned long, addr, size_t, len)
 	if (invalid_64bit_range(addr, len))
 		return -EINVAL;
 
-	return vm_munmap(current->mm, addr, len);
+	return vm_munmap(addr, len);
 }
 
 extern unsigned long do_mremap(unsigned long addr,

arch/x86/kvm/x86.c

@@ -6364,7 +6364,7 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
 	if (!user_alloc && !old.user_alloc && old.rmap && !npages) {
 		int ret;
 
-		ret = vm_munmap(current->mm, old.userspace_addr,
+		ret = vm_munmap(old.userspace_addr,
 				old.npages * PAGE_SIZE);
 		if (ret < 0)
 			printk(KERN_WARNING

drivers/gpu/drm/i810/i810_dma.c

@@ -158,8 +158,7 @@ static int i810_unmap_buffer(struct drm_buf *buf)
 	if (buf_priv->currently_mapped != I810_BUF_MAPPED)
 		return -EINVAL;
 
-	retcode = vm_munmap(current->mm,
-			    (unsigned long)buf_priv->virtual,
+	retcode = vm_munmap((unsigned long)buf_priv->virtual,
 			    (size_t) buf->total);
 
 	buf_priv->currently_mapped = I810_BUF_UNMAPPED;

fs/aio.c

@@ -94,7 +94,7 @@ static void aio_free_ring(struct kioctx *ctx)
 
 	if (info->mmap_size) {
 		BUG_ON(ctx->mm != current->mm);
-		vm_munmap(ctx->mm, info->mmap_base, info->mmap_size);
+		vm_munmap(info->mmap_base, info->mmap_size);
 	}
 
 	if (info->ring_pages && info->ring_pages != info->internal_pages)

include/linux/mm.h

@@ -1403,7 +1403,7 @@ extern int do_munmap(struct mm_struct *, unsigned long, size_t);
 
 /* These take the mm semaphore themselves */
 extern unsigned long vm_brk(unsigned long, unsigned long);
-extern int vm_munmap(struct mm_struct *, unsigned long, size_t);
+extern int vm_munmap(unsigned long, size_t);
 extern unsigned long vm_mmap(struct file *, unsigned long,
         unsigned long, unsigned long,
         unsigned long, unsigned long);

mm/mmap.c

@@ -2134,9 +2134,10 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
 }
 EXPORT_SYMBOL(do_munmap);
 
-int vm_munmap(struct mm_struct *mm, unsigned long start, size_t len)
+int vm_munmap(unsigned long start, size_t len)
 {
 	int ret;
+	struct mm_struct *mm = current->mm;
 
 	down_write(&mm->mmap_sem);
 	ret = do_munmap(mm, start, len);
@@ -2148,7 +2149,7 @@ EXPORT_SYMBOL(vm_munmap);
 SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
 {
 	profile_munmap(addr);
-	return vm_munmap(current->mm, addr, len);
+	return vm_munmap(addr, len);
 }
 
 static inline void verify_mm_writelocked(struct mm_struct *mm)

mm/nommu.c

@@ -1734,8 +1734,9 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len)
 }
 EXPORT_SYMBOL(do_munmap);
 
-int vm_munmap(struct mm_struct *mm, unsigned long addr, size_t len)
+int vm_munmap(unsigned long addr, size_t len)
 {
+	struct mm_struct *mm = current->mm;
 	int ret;
 
 	down_write(&mm->mmap_sem);
@@ -1747,7 +1748,7 @@ EXPORT_SYMBOL(vm_munmap);
 
 SYSCALL_DEFINE2(munmap, unsigned long, addr, size_t, len)
 {
-	return vm_munmap(current->mm, addr, len);
+	return vm_munmap(addr, len);
 }
 
 /*