+ panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix.patch added to mm-nonmm-unstable branch

+ panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: panic: add __maybe_unused to sys_info_avail
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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 via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Nathan Chancellor <nathan@kernel.org>
Subject: panic: add __maybe_unused to sys_info_avail
Date: Tue, 08 Jul 2025 08:37:57 -0700

Clang warns (or errors with CONFIG_WERROR=y):

  lib/sys_info.c:52:19: error: variable 'sys_info_avail' is not needed and will not be emitted [-Werror,-Wunneeded-internal-declaration]
     52 | static const char sys_info_avail[] = "tasks,mem,timers,locks,ftrace,all_bt,blocked_tasks";
        |                   ^~~~~~~~~~~~~~

sys_info_avail is only used within sizeof(), meaning it is only used at
compile time, which clang warns about in case the developer intended to
use the variable elsewhere. This appears to be intentional in this case,
so mark sys_info_avail with __maybe_unused to silence the warning.

Link: https://lkml.kernel.org/r/20250708-fix-clang-sys_info_avail-warning-v1-1-60d239eacd64@kernel.org
Signed-off-by: Nathan Chancellor <nathan@kernel.org>
Cc: Feng Tang <feng.tang@linux.alibaba.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/sys_info.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/lib/sys_info.c~panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix
+++ a/lib/sys_info.c
@@ -49,7 +49,7 @@ unsigned long sys_info_parse_param(char
 
 #ifdef CONFIG_SYSCTL
 
-static const char sys_info_avail[] = "tasks,mem,timers,locks,ftrace,all_bt,blocked_tasks";
+static const char sys_info_avail[] __maybe_unused = "tasks,mem,timers,locks,ftrace,all_bt,blocked_tasks";
 
 int sysctl_sys_info_handler(const struct ctl_table *ro_table, int write,
 					  void *buffer, size_t *lenp,
_

Patches currently in -mm which might be from nathan@kernel.org are

panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix.patch

+ panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix.patch added to mm-nonmm-unstable branch

[Andrew Morton]

The patch titled
     Subject: panic: fix compilation error (`make W=1`)
has been added to the -mm mm-nonmm-unstable branch.  Its filename is
     panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix.patch

This patch will shortly appear at
     https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix.patch

This patch will later appear in the mm-nonmm-unstable branch at
    git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

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 via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days

------------------------------------------------------
From: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Subject: panic: fix compilation error (`make W=1`)
Date: Thu, 10 Jul 2025 12:48:16 +0300

Compiler is not happy about the recently added code:

lib/sys_info.c:52:19: error: variable 'sys_info_avail' is not needed and will not be emitted [-Werror,-Wunneeded-internal-declaration]
   52 | static const char sys_info_avail[] = "tasks,mem,timers,locks,ftrace,all_bt,blocked_tasks";
      |                   ^~~~~~~~~~~~~~

Fix it in the same way how, for example, lib/vsprintf.c does in the similar
cases, i.e. by using string literal directly as sizeof() parameter.

Link: https://lkml.kernel.org/r/20250710094816.771656-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Cc: Feng Tang <feng.tang@linux.alibaba.com>
Cc: John Ogness <john.ogness@linutronix.de>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Lance Yang <lance.yang@linux.dev>
Cc: Nathan Chancellor <nathan@kernel.org>
Cc: "Paul E . McKenney" <paulmck@kernel.org>
Cc: Petr Mladek <pmladek@suse.com>
Cc: Steven Rostedt <rostedt@goodmis.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

 lib/sys_info.c |    4 +---
 1 file changed, 1 insertion(+), 3 deletions(-)

--- a/lib/sys_info.c~panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix
+++ a/lib/sys_info.c
@@ -49,13 +49,11 @@ unsigned long sys_info_parse_param(char
 
 #ifdef CONFIG_SYSCTL
 
-static const char sys_info_avail[] = "tasks,mem,timers,locks,ftrace,all_bt,blocked_tasks";
-
 int sysctl_sys_info_handler(const struct ctl_table *ro_table, int write,
 					  void *buffer, size_t *lenp,
 					  loff_t *ppos)
 {
-	char names[sizeof(sys_info_avail) + 1];
+	char names[sizeof("tasks,mem,timers,locks,ftrace,all_bt,blocked_tasks") + 1];
 	struct ctl_table table;
 	unsigned long *si_bits_global;
 
_

Patches currently in -mm which might be from andriy.shevchenko@linux.intel.com are

panic-add-panic_sys_info-sysctl-to-take-human-readable-string-parameter-fix.patch