On 8/28/25 09:43, Thorsten Leemhuis wrote:
> On 27.08.25 10:26, Vlastimil Babka wrote:
>> Specifying a non-zero value for a new struct kmem_cache_args field
>> sheaf_capacity will setup a caching layer of percpu arrays called
>> sheaves of given capacity for the created cache.
>>
>> Allocations from the cache will allocate via the percpu sheaves (main or
>> spare) as long as they have no NUMA node preference. Frees will also
>> put the object back into one of the sheaves.
>> [...]
>
> This patch showed up in linux-next today and from a *quick* glance at
> things I suspect it might be the reason why my daily next rpm builds for
> Fedora failed today like this:
Hi, thanks for the report.
> ""
> In file included from ./include/linux/spinlock.h:63,
> from ./include/linux/mmzone.h:8,
> from ./include/linux/gfp.h:7,
> from ./include/linux/mm.h:7,
> from mm/slub.c:13:
> mm/slub.c: In function ‘__pcs_replace_empty_main’:
> mm/slub.c:4727:64: error: ‘local_trylock_t’ {aka ‘__seg_gs struct spinlock’}
> has no member named ‘llock’; did you mean ‘lock’?
> 4727 |
> lockdep_assert_held(this_cpu_ptr(&s->cpu_sheaves->lock.llock));
> | ^~~~~
> ./include/linux/lockdep.h:392:61: note: in definition of macro
> ‘lockdep_assert_held’
> 392 | #define lockdep_assert_held(l) do { (void)(l); }
> while (0)
> | ^
> [...]
> mm/slub.c:5653:29: note: in expansion of macro ‘this_cpu_ptr’
> 5653 |
> lockdep_assert_held(this_cpu_ptr(&s->cpu_sheaves->lock.llock));
> | ^~~~~~~~~~~~
> make[3]: *** [scripts/Makefile.build:287: mm/slub.o] Error 1
> make[2]: *** [scripts/Makefile.build:556: mm] Error 2
> make[2]: *** Waiting for unfinished jobs....
> make[1]: ***
> [/builddir/build/BUILD/kernel-6.17.0-build/kernel-next-20250828/linux-6.17.0-0.0.next.20250828.432.vanilla.fc44.x86_64/Makefile:2017:
> .] Error 2
> make: *** [Makefile:256: __sub-make] Error 2
> ""
>
> Full log:
> https://download.copr.fedorainfracloud.org/results/@kernel-vanilla/next/fedora-rawhide-x86_64/09498568-next-next-all/builder-live.log.gz
Oh so I assume the .config here has both LOCKDEP and PREEMPT_RT?
I tried to make lockdep_assert_held() with trylock but forgot about the RT
difference. The solution is Alexei's patch
https://lore.kernel.org/all/20250718021646.73353-2-
alexei.starovoi...@gmail.com/
Wonder if I can just fast-track it to here from that series?
