+ mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.patch added to -mm tree

+ mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: mm/memcontrol: return 1 from cgroup.memory __setup() handler
has been added to the -mm tree.  Its filename is
     mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.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/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Randy Dunlap <rdunlap@infradead.org>
Subject: 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
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>
---

 mm/memcontrol.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/memcontrol.c~mm-memcontrol-return-1-from-cgroupmemory-__setup-handler
+++ a/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);
 
_

Patches currently in -mm which might be from rdunlap@infradead.org are

mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.patch
mm-mmap-return-1-from-stack_guard_gap-__setup-handler.patch
mm-usercopy-return-1-from-hardened_usercopy-__setup-handler.patch
inith-improve-__setup-and-early_param-documentation.patch
init-mainc-return-1-from-handled-__setup-functions.patch
docs-sysctl-kernel-add-missing-bit-to-panic_print-fix.patch

+ mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.patch added to -mm tree

[Andrew Morton]

The patch titled
     Subject: mm/memcontrol: return 1 from cgroup.memory __setup() handler
has been added to the -mm tree.  Its filename is
     mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.patch

This patch should soon appear at
    https://ozlabs.org/~akpm/mmots/broken-out/mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.patch
and later at
    https://ozlabs.org/~akpm/mmotm/broken-out/mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.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/process/submit-checklist.rst when testing your code ***

The -mm tree is included into linux-next and is updated
there every 3-4 working days

------------------------------------------------------
From: Randy Dunlap <rdunlap@infradead.org>
Subject: 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
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>
---

 mm/memcontrol.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/mm/memcontrol.c~mm-memcontrol-return-1-from-cgroupmemory-__setup-handler
+++ a/mm/memcontrol.c
@@ -7100,7 +7100,7 @@ static int __init cgroup_memory(char *s)
 		if (!strcmp(token, "nokmem"))
 			cgroup_memory_nokmem = true;
 	}
-	return 0;
+	return 1;
 }
 __setup("cgroup.memory=", cgroup_memory);
 
_

Patches currently in -mm which might be from rdunlap@infradead.org are

mm-memcontrol-return-1-from-cgroupmemory-__setup-handler.patch
docs-sysctl-kernel-add-missing-bit-to-panic_print-fix.patch