| From | Herton Ronaldo Krzesinski <> | Subject | [PATCH 53/74] mm: compaction: fix echo 1 > compact_memory return error issue | Date | Thu, 24 Jan 2013 01:27:05 -0200 |
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3.5.7.4 -stable review patch. If anyone has any objections, please let me know.
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From: Jason Liu <r64343@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 <r64343@freescale.com> Suggested-by: David Rientjes <rientjes@google.com> Acked-by: Mel Gorman <mgorman@suse.de> Cc: Rik van Riel <riel@redhat.com> Cc: Minchan Kim <minchan@kernel.org> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com> Acked-by: David Rientjes <rientjes@google.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Herton Ronaldo Krzesinski <herton.krzesinski@canonical.com> --- mm/compaction.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-)
diff --git a/mm/compaction.c b/mm/compaction.c index 2f42d95..cf955bb 100644 --- a/mm/compaction.c +++ b/mm/compaction.c @@ -843,7 +843,7 @@ static int compact_node(int nid) } /* Compact all nodes in the system */ -static int compact_nodes(void) +static void compact_nodes(void) { int nid; @@ -852,8 +852,6 @@ static int compact_nodes(void) for_each_online_node(nid) compact_node(nid); - - return COMPACT_COMPLETE; } /* The written value is actually unused, all memory is compacted */ @@ -864,7 +862,7 @@ int sysctl_compaction_handler(struct ctl_table *table, int write, void __user *buffer, size_t *length, loff_t *ppos) { if (write) - return compact_nodes(); + compact_nodes(); return 0; } -- 1.7.9.5
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