Revision a247c3a97a0216b18a46243eda26081f1928ec37 authored by Andrea Arcangeli on 22 September 2010, 20:05:12 UTC, committed by Linus Torvalds on 23 September 2010, 00:22:39 UTC
The below bug in fork led to the rmap walk finding the parent huge-pmd twice instead of just once, because the anon_vma_chain objects of the child vma still point to the vma->vm_mm of the parent. The patch fixes it by making the rmap walk accurate during fork. It's not a big deal normally but it worth being accurate considering the cost is the same. Signed-off-by: Andrea Arcangeli <aarcange@redhat.com> Acked-by: Johannes Weiner <jweiner@redhat.com> Acked-by: Rik van Riel <riel@redhat.com> Acked-by: Hugh Dickins <hughd@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
1 parent df08cdc
init.c
/* -*- linux-c -*- --------------------------------------------------------- *
*
* linux/fs/autofs/init.c
*
* Copyright 1997-1998 Transmeta Corporation -- All Rights Reserved
*
* This file is part of the Linux kernel and is made available under
* the terms of the GNU General Public License, version 2, or at your
* option, any later version, incorporated herein by reference.
*
* ------------------------------------------------------------------------- */
#include <linux/module.h>
#include <linux/init.h>
#include "autofs_i.h"
static int autofs_get_sb(struct file_system_type *fs_type,
int flags, const char *dev_name, void *data, struct vfsmount *mnt)
{
return get_sb_nodev(fs_type, flags, data, autofs_fill_super, mnt);
}
static struct file_system_type autofs_fs_type = {
.owner = THIS_MODULE,
.name = "autofs",
.get_sb = autofs_get_sb,
.kill_sb = autofs_kill_sb,
};
static int __init init_autofs_fs(void)
{
return register_filesystem(&autofs_fs_type);
}
static void __exit exit_autofs_fs(void)
{
unregister_filesystem(&autofs_fs_type);
}
module_init(init_autofs_fs);
module_exit(exit_autofs_fs);
#ifdef DEBUG
void autofs_say(const char *name, int len)
{
printk("(%d: ", len);
while ( len-- )
printk("%c", *name++);
printk(")\n");
}
#endif
MODULE_LICENSE("GPL");
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