linux-kernel - Re: Linux 6.12.18

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Message-ID: <CAAhV-H5TZ5ZE1XEQpzDU_o407V6+-q7i8xMFnmKdvyexG8ZG1Q@mail.gmail.com>
Date: Sat, 8 Mar 2025 13:28:32 +0800
From: Huacai Chen <chenhuacai@...nel.org>
To: Miguel Ojeda <ojeda@...nel.org>
Cc: gregkh@...uxfoundation.org, akpm@...ux-foundation.org, jslaby@...e.cz, 
	linux-kernel@...r.kernel.org, lwn@....net, stable@...r.kernel.org, 
	torvalds@...ux-foundation.org, WANG Xuerui <kernel@...0n.name>, 
	loongarch@...ts.linux.dev
Subject: Re: Linux 6.12.18

Hi, Miguel,

On Sat, Mar 8, 2025 at 5:50 AM Miguel Ojeda <ojeda@...nel.org> wrote:
>
> On Fri, 07 Mar 2025 18:52:44 +0100 Greg Kroah-Hartman <gregkh@...uxfoundation.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.cn/T/#u

Huacai
>
> Cheers,
> Miguel