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SubjectRe: [PATCH] mm: Fix dirty_bytes/dirty_background_bytes sysctls on 64bit arches
On Sun, 1 Feb 2009, Sven Wegener wrote:

> 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.
> Signed-off-by: Sven Wegener <>

Acked-by: David Rientjes <>

You'll also need the following since vm_dirty_bytes is declared as an
unsigned long. Andrew, can you queue Sven's fix for rc4 with this folded
into it?

Signed-off-by: David Rientjes <>
mm/page-writeback.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/mm/page-writeback.c b/mm/page-writeback.c
--- 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);

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