3.0-stable review patch. If anyone has any objections, please let me know.
------------------
From: Jason Liu <r64...@freescale.com>
commit 7964c06d66c76507d8b6b662bffea770c29ef0ce upstream.
when run the folloing command under shell, it will return error
sh/$ echo 1 > /proc/sys/vm/compact_memory
sh/$ sh: write error: Bad address
After strace, I found the following log:
...
write(1, "1\n", 2) = 3
write(1, "", 4294967295) = -1 EFAULT (Bad address)
write(2, "echo: write error: Bad address\n", 31echo: write error: Bad address
) = 31
This tells system return 3(COMPACT_COMPLETE) after write data to
compact_memory.
The fix is to make the system just return 0 instead 3(COMPACT_COMPLETE)
from sysctl_compaction_handler after compaction_nodes finished.
Signed-off-by: Jason Liu <r64...@freescale.com>
Suggested-by: David Rientjes <rient...@google.com>
Acked-by: Mel Gorman <mgor...@suse.de>
Cc: Rik van Riel <r...@redhat.com>
Cc: Minchan Kim <minc...@kernel.org>
Cc: KAMEZAWA Hiroyuki <kamezawa.hir...@jp.fujitsu.com>
Acked-by: David Rientjes <rient...@google.com>
Signed-off-by: Andrew Morton <a...@linux-foundation.org>
Signed-off-by: Linus Torvalds <torva...@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
mm/compaction.c | 6 ++----
1 file changed, 2 insertions(+), 4 deletions(-)
--- a/mm/compaction.c
+++ b/mm/compaction.c
@@ -714,14 +714,12 @@ static int compact_node(int nid)
}
/* Compact all nodes in the system */
-static int compact_nodes(void)
+static void compact_nodes(void)
{
int nid;
for_each_online_node(nid)
compact_node(nid);
-
- return COMPACT_COMPLETE;
}
/* The written value is actually unused, all memory is compacted */
@@ -732,7 +730,7 @@ int sysctl_compaction_handler(struct ctl
void __user *buffer, size_t *length, loff_t *ppos)
{
if (write)
- return compact_nodes();
+ compact_nodes();
return 0;
}
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majord...@vger.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/
