Hi, Miguel,
On Sat, Mar 8, 2025 at 5:50 AM Miguel Ojeda <ojeda@xxxxxxxxxx> wrote:
>
> On Fri, 07 Mar 2025 18:52:44 +0100 Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx> 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@xxxxxxxxxxx/T/#u
Huacai
>
> Cheers,
> Miguel
