maps4: move clear_refs code to task_mmu.c
This puts all the clear_refs code where it belongs and probably lets things
compile on MMU-less systems as well.
Signed-off-by: Matt Mackall <mpm@selenic.com>
Cc: Jeremy Fitzhardinge <jeremy@goop.org>
Cc: David Rientjes <rientjes@google.com>
Cc: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
diff --git a/fs/proc/base.c b/fs/proc/base.c
index 3353748..1bd646d 100644
--- a/fs/proc/base.c
+++ b/fs/proc/base.c
@@ -88,10 +88,6 @@
* in /proc for a task before it execs a suid executable.
*/
-
-/* Worst case buffer size needed for holding an integer. */
-#define PROC_NUMBUF 13
-
struct pid_entry {
char *name;
int len;
@@ -935,42 +931,6 @@
.write = oom_adjust_write,
};
-#ifdef CONFIG_MMU
-static ssize_t clear_refs_write(struct file *file, const char __user *buf,
- size_t count, loff_t *ppos)
-{
- struct task_struct *task;
- char buffer[PROC_NUMBUF], *end;
- struct mm_struct *mm;
-
- memset(buffer, 0, sizeof(buffer));
- if (count > sizeof(buffer) - 1)
- count = sizeof(buffer) - 1;
- if (copy_from_user(buffer, buf, count))
- return -EFAULT;
- if (!simple_strtol(buffer, &end, 0))
- return -EINVAL;
- if (*end == '\n')
- end++;
- task = get_proc_task(file->f_path.dentry->d_inode);
- if (!task)
- return -ESRCH;
- mm = get_task_mm(task);
- if (mm) {
- clear_refs_smap(mm);
- mmput(mm);
- }
- put_task_struct(task);
- if (end - buffer == 0)
- return -EIO;
- return end - buffer;
-}
-
-static struct file_operations proc_clear_refs_operations = {
- .write = clear_refs_write,
-};
-#endif
-
#ifdef CONFIG_AUDITSYSCALL
#define TMPBUFLEN 21
static ssize_t proc_loginuid_read(struct file * file, char __user * buf,
diff --git a/fs/proc/internal.h b/fs/proc/internal.h
index 05b3e90..ddfaeec 100644
--- a/fs/proc/internal.h
+++ b/fs/proc/internal.h
@@ -56,11 +56,7 @@
extern const struct file_operations proc_maps_operations;
extern const struct file_operations proc_numa_maps_operations;
extern const struct file_operations proc_smaps_operations;
-
-extern const struct file_operations proc_maps_operations;
-extern const struct file_operations proc_numa_maps_operations;
-extern const struct file_operations proc_smaps_operations;
-
+extern const struct file_operations proc_clear_refs_operations;
void free_proc_entry(struct proc_dir_entry *de);
diff --git a/fs/proc/task_mmu.c b/fs/proc/task_mmu.c
index abc44f3..fcdbd23 100644
--- a/fs/proc/task_mmu.c
+++ b/fs/proc/task_mmu.c
@@ -323,19 +323,47 @@
static struct mm_walk clear_refs_walk = { .pmd_entry = clear_refs_pte_range };
-void clear_refs_smap(struct mm_struct *mm)
+static ssize_t clear_refs_write(struct file *file, const char __user *buf,
+ size_t count, loff_t *ppos)
{
+ struct task_struct *task;
+ char buffer[PROC_NUMBUF], *end;
+ struct mm_struct *mm;
struct vm_area_struct *vma;
- down_read(&mm->mmap_sem);
- for (vma = mm->mmap; vma; vma = vma->vm_next)
- if (vma->vm_mm && !is_vm_hugetlb_page(vma))
- walk_page_range(vma->vm_mm, vma->vm_start, vma->vm_end,
- &clear_refs_walk, vma);
- flush_tlb_mm(mm);
- up_read(&mm->mmap_sem);
+ memset(buffer, 0, sizeof(buffer));
+ if (count > sizeof(buffer) - 1)
+ count = sizeof(buffer) - 1;
+ if (copy_from_user(buffer, buf, count))
+ return -EFAULT;
+ if (!simple_strtol(buffer, &end, 0))
+ return -EINVAL;
+ if (*end == '\n')
+ end++;
+ task = get_proc_task(file->f_path.dentry->d_inode);
+ if (!task)
+ return -ESRCH;
+ mm = get_task_mm(task);
+ if (mm) {
+ down_read(&mm->mmap_sem);
+ for (vma = mm->mmap; vma; vma = vma->vm_next)
+ if (!is_vm_hugetlb_page(vma))
+ walk_page_range(mm, vma->vm_start, vma->vm_end,
+ &clear_refs_walk, vma);
+ flush_tlb_mm(mm);
+ up_read(&mm->mmap_sem);
+ mmput(mm);
+ }
+ put_task_struct(task);
+ if (end - buffer == 0)
+ return -EIO;
+ return end - buffer;
}
+const struct file_operations proc_clear_refs_operations = {
+ .write = clear_refs_write,
+};
+
static void *m_start(struct seq_file *m, loff_t *pos)
{
struct proc_maps_private *priv = m->private;