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author | Randy Dunlap <rdunlap@infradead.org> | 2022-03-22 14:40:31 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2022-03-22 15:57:02 -0700 |
commit | 460a79e18842caca6fa0c415de4a3ac1e671ac50 (patch) | |
tree | c5b354f840b47aac53aa5c373046a9627351a5b4 /mm/memcontrol.c | |
parent | c9afe31ec443ea6d81d556159abc7ef0bc462ac0 (diff) | |
download | linux-460a79e18842caca6fa0c415de4a3ac1e671ac50.tar.gz linux-460a79e18842caca6fa0c415de4a3ac1e671ac50.tar.bz2 linux-460a79e18842caca6fa0c415de4a3ac1e671ac50.zip |
mm/memcontrol: return 1 from cgroup.memory __setup() handler
__setup() handlers should return 1 if the command line option is handled
and 0 if not (or maybe never return 0; it just pollutes init's
environment).
The only reason that this particular __setup handler does not pollute
init's environment is that the setup string contains a '.', as in
"cgroup.memory". This causes init/main.c::unknown_boottoption() to
consider it to be an "Unused module parameter" and ignore it. (This is
for parsing of loadable module parameters any time after kernel init.)
Otherwise the string "cgroup.memory=whatever" would be added to init's
environment strings.
Instead of relying on this '.' quirk, just return 1 to indicate that the
boot option has been handled.
Note that there is no warning message if someone enters:
cgroup.memory=anything_invalid
Link: https://lkml.kernel.org/r/20220222005811.10672-1-rdunlap@infradead.org
Fixes: f7e1cb6ec51b0 ("mm: memcontrol: account socket memory in unified hierarchy memory controller")
Signed-off-by: Randy Dunlap <rdunlap@infradead.org>
Reported-by: Igor Zhbanov <i.zhbanov@omprussia.ru>
Link: lore.kernel.org/r/64644a2f-4a20-bab3-1e15-3b2cdd0defe3@omprussia.ru
Reviewed-by: Michal Koutný <mkoutny@suse.com>
Cc: Johannes Weiner <hannes@cmpxchg.org>
Cc: Michal Hocko <mhocko@kernel.org>
Cc: Vladimir Davydov <vdavydov.dev@gmail.com>
Cc: Roman Gushchin <roman.gushchin@linux.dev>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/memcontrol.c')
-rw-r--r-- | mm/memcontrol.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/memcontrol.c b/mm/memcontrol.c index 17398e7601f6..416a608939f5 100644 --- a/mm/memcontrol.c +++ b/mm/memcontrol.c @@ -7058,7 +7058,7 @@ static int __init cgroup_memory(char *s) if (!strcmp(token, "nokmem")) cgroup_memory_nokmem = true; } - return 0; + return 1; } __setup("cgroup.memory=", cgroup_memory); |