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authorSven Wegener <sven.wegener@stealer.net>2009-02-11 13:04:23 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2009-02-11 14:25:35 -0800
commitfc3501d411d34823fb9be248a95a0c44f945866f (patch)
tree9a16de761b4c7d3401149a212b8004df23fbbcca
parent35887b1cf74dc751dd0574b26515142d3cea9376 (diff)
downloadlinux-2.6.38-lt-ux500-fc3501d411d34823fb9be248a95a0c44f945866f.tar.gz
mm: fix dirty_bytes/dirty_background_bytes sysctls on 64bit arches
We need to pass an unsigned long as the minimum, because it gets casted to an unsigned long in the sysctl handler. If we pass an int, we'll access four more bytes on 64bit arches, resulting in a random minimum value. [rientjes@google.com: fix type of `old_bytes'] Signed-off-by: Sven Wegener <sven.wegener@stealer.net> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Dave Chinner <david@fromorbit.com> Cc: Christoph Lameter <cl@linux-foundation.org> Cc: David Rientjes <rientjes@google.com> Signed-off-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/sysctl.c5
-rw-r--r--mm/page-writeback.c2
2 files changed, 4 insertions, 3 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 790f9d78566..c5ef44ff850 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -101,6 +101,7 @@ static int two = 2;
static int zero;
static int one = 1;
+static unsigned long one_ul = 1;
static int one_hundred = 100;
/* this is needed for the proc_dointvec_minmax for [fs_]overflow UID and GID */
@@ -974,7 +975,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = &dirty_background_bytes_handler,
.strategy = &sysctl_intvec,
- .extra1 = &one,
+ .extra1 = &one_ul,
},
{
.ctl_name = VM_DIRTY_RATIO,
@@ -995,7 +996,7 @@ static struct ctl_table vm_table[] = {
.mode = 0644,
.proc_handler = &dirty_bytes_handler,
.strategy = &sysctl_intvec,
- .extra1 = &one,
+ .extra1 = &one_ul,
},
{
.procname = "dirty_writeback_centisecs",
diff --git a/mm/page-writeback.c b/mm/page-writeback.c
index dc32dae01e5..c17005e7397 100644
--- a/mm/page-writeback.c
+++ b/mm/page-writeback.c
@@ -209,7 +209,7 @@ int dirty_bytes_handler(struct ctl_table *table, int write,
struct file *filp, void __user *buffer, size_t *lenp,
loff_t *ppos)
{
- int old_bytes = vm_dirty_bytes;
+ unsigned long old_bytes = vm_dirty_bytes;
int ret;
ret = proc_doulongvec_minmax(table, write, filp, buffer, lenp, ppos);