Re: Linux 6.12.18

Hi, Miguel,

On Sat, Mar 8, 2025 at 5:50 AM Miguel Ojeda ojeda@kernel.org wrote:

On Fri, 07 Mar 2025 18:52:44 +0100 Greg Kroah-Hartman gregkh@linuxfoundation.org wrote:

...

I'm announcing the release of the 6.12.18 kernel.

All users of the 6.12 kernel series must upgrade.

While testing another backport, I found an unrelated build failure for loongarch in v6.12.18 that I did not see in v6.12.17 -- I cannot find it reported from a quick look, so I am doing so here:

   CC      arch/loongarch/kernel/asm-offsets.s - due to target missing
In file included from arch/loongarch/kernel/asm-offsets.c:8:
In file included from ./include/linux/sched.h:12:
In file included from ./arch/loongarch/include/generated/asm/current.h:1:
In file included from ./include/asm-generic/current.h:6:
./include/linux/thread_info.h:249:6: error: call to undeclared function 'annotate_reachable'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
  249 |         if (WARN_ON_ONCE(bytes > INT_MAX))
      |             ^
./include/asm-generic/bug.h:113:3: note: expanded from macro 'WARN_ON_ONCE'
  113 |                 __WARN_FLAGS(BUGFLAG_ONCE |                     \
      |                 ^
./arch/loongarch/include/asm/bug.h:47:2: note: expanded from macro '__WARN_FLAGS'
   47 |         annotate_reachable();                                   \
      |         ^

As well as warnings:

In file included from arch/loongarch/kernel/asm-offsets.c:9:
In file included from ./include/linux/mm.h:1120:
In file included from ./include/linux/huge_mm.h:8:
In file included from ./include/linux/fs.h:33:
In file included from ./include/linux/percpu-rwsem.h:7:
In file included from ./include/linux/rcuwait.h:6:
In file included from ./include/linux/sched/signal.h:6:
./include/linux/signal.h:114:27: warning: array index 3 is past the end of the array (that has type 'const unsigned long[1]') [-Warray-bounds]
  114 |                 return  (set1->sig[3] == set2->sig[3]) &&
      |                                          ^         ~
./include/uapi/asm-generic/signal.h:62:2: note: array 'sig' declared here
   62 |         unsigned long sig[_NSIG_WORDS];
      |         ^

I hope that helps.

This is caused by the backport commit 06e24745985c8dd0da183 ("objtool: Remove annotate_{,un}reachable()"), but missing the commit 624bde3465f660e54a7cd4c1 ("loongarch: Use ASM_REACHABLE"), I will fix it later.

In addition, it is better to also backport [1], since similar patches for x86 have been backported, otherwise there will be build warnings.

[1] https://lore.kernel.org/loongarch/20250211115016.26913-8-yangtiezhu@loongson...

Huacai

Cheers, Miguel