The patch titled Subject: mm: compaction: fix echo 1 > compact_memory return error issue has been added to the -mm tree. Its filename is mm-compaction-fix-echo-1-compact_memory-return-error-issue.patch Before you just go and hit "reply", please: a) Consider who else should be cc'ed b) Prefer to cc a suitable mailing list as well c) Ideally: find the original patch on the mailing list and do a reply-to-all to that, adding suitable additional cc's *** Remember to use Documentation/SubmitChecklist when testing your code *** The -mm tree is included into linux-next and is updated there every 3-4 working days ------------------------------------------------------ From: Jason Liu <r64343@xxxxxxxxxxxxx> Subject: mm: compaction: fix echo 1 > compact_memory return error issue 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@xxxxxxxxxxxxx> Suggested-by: David Rientjes <rientjes@xxxxxxxxxx> Cc: Mel Gorman <mgorman@xxxxxxx> Cc: Rik van Riel <riel@xxxxxxxxxx> Cc: Minchan Kim <minchan@xxxxxxxxxx> Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@xxxxxxxxxxxxxx> Cc: <stable@xxxxxxxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- mm/compaction.c | 6 ++---- 1 file changed, 2 insertions(+), 4 deletions(-) diff -puN mm/compaction.c~mm-compaction-fix-echo-1-compact_memory-return-error-issue mm/compaction.c --- a/mm/compaction.c~mm-compaction-fix-echo-1-compact_memory-return-error-issue +++ a/mm/compaction.c @@ -1210,7 +1210,7 @@ static int compact_node(int nid) } /* Compact all nodes in the system */ -static int compact_nodes(void) +static void compact_nodes(void) { int nid; @@ -1219,8 +1219,6 @@ 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 */ @@ -1231,7 +1229,7 @@ int sysctl_compaction_handler(struct ctl void __user *buffer, size_t *length, loff_t *ppos) { if (write) - return compact_nodes(); + compact_nodes(); return 0; } _ Patches currently in -mm which might be from r64343@xxxxxxxxxxxxx are mm-compaction-fix-echo-1-compact_memory-return-error-issue.patch mm-compaction-make-__compact_pgdat-and-compact_pgdat-return-void.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html