[PATCH] mm/page_owner: use vmalloc instead of kmalloc

miles.chen
2018-10-25T18:34:51Z

From: Miles Chen <miles.chen@mediatek.com>

The kbuf used by page owner is allocated by kmalloc(),
which means it can use only normal memory and there might
be a "out of memory" issue when we're out of normal memory.

Use vmalloc() so we can also allocate kbuf from highmem
on 32bit kernel.

Signed-off-by: Miles Chen <miles.chen@mediatek.com>
---
mm/page_owner.c | 8 ++++----
1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/mm/page_owner.c b/mm/page_owner.c
index d80adfe702d3..7e6962adaa79 100644
--- a/mm/page_owner.c
+++ b/mm/page_owner.c
@@ -1,7 +1,6 @@
// SPDX-License-Identifier: GPL-2.0
#include <linux/debugfs.h>
#include <linux/mm.h>
-#include <linux/slab.h>
#include <linux/uaccess.h>
#include <linux/bootmem.h>
#include <linux/stacktrace.h>
@@ -10,6 +9,7 @@
#include <linux/migrate.h>
#include <linux/stackdepot.h>
#include <linux/seq_file.h>
+#include <linux/vmalloc.h>

#include "internal.h"

@@ -351,7 +351,7 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn,
.skip = 0
};

- kbuf = kmalloc(count, GFP_KERNEL);
+ kbuf = vmalloc(count);
if (!kbuf)
return -ENOMEM;

@@ -397,11 +397,11 @@ print_page_owner(char __user *buf, size_t count, unsigned long pfn,
if (copy_to_user(buf, kbuf, ret))
ret = -EFAULT;

- kfree(kbuf);
+ vfree(kbuf);
return ret;

err:
- kfree(kbuf);
+ vfree(kbuf);
return -ENOMEM;
}

--
2.18.0