Re: linux-next: build failure after merge of the slab tree

From: Alexei Starovoitov <alexei.starovoitov@gmail.com>
To: Vlastimil Babka <vbabka@suse.cz>
Cc: Stephen Rothwell <sfr@canb.auug.org.au>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andrii@kernel.org>, bpf <bpf@vger.kernel.org>,
	Networking <netdev@vger.kernel.org>,
	Hyeonggon Yoo <42.hyeyoo@gmail.com>,
	Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Linux Next Mailing List <linux-next@vger.kernel.org>,
	Marco Elver <elver@google.com>
Subject: Re: linux-next: build failure after merge of the slab tree
Date: Tue, 6 Sep 2022 20:05:44 -0700	[thread overview]
Message-ID: <CAADnVQKJORAcV75CHE1yG6_+c8qnoOj6gf=zJG9vnWwR5+4SqQ@mail.gmail.com> (raw)
In-Reply-To: <CAADnVQJTDdA=vpQhrbAbX7oEQ=uaPXwAmjMzpW4Nk2Xi9f2JLA@mail.gmail.com>

On Tue, Sep 6, 2022 at 11:37 AM Alexei Starovoitov
<alexei.starovoitov@gmail.com> wrote:
>
> On Tue, Sep 6, 2022 at 12:53 AM Vlastimil Babka <vbabka@suse.cz> wrote:
> >
> > On 9/6/22 08:51, Stephen Rothwell wrote:
> > > Hi all,
> >
> > Hi,
> >
> > > After merging the slab tree, today's linux-next build (powerpc
> > > ppc64_defconfig) failed like this:
> > >
> > > kernel/bpf/memalloc.c: In function 'bpf_mem_free':
> > > kernel/bpf/memalloc.c:613:33: error: implicit declaration of function '__ksize'; did you mean 'ksize'? [-Werror=implicit-function-declaration]
> > >    613 |         idx = bpf_mem_cache_idx(__ksize(ptr - LLIST_NODE_SZ));
> > >        |                                 ^~~~~~~
> > >        |                                 ksize
> >
> > Could you use ksize() here? I'm guessing you picked __ksize() because
> > kasan_unpoison_element() in mm/mempool.c did, but that's to avoid
> > kasan_unpoison_range() in ksize() as this caller does it differently.
> > AFAICS your function doesn't handle kasan differently, so ksize() should
> > be fine.
>
> Ok. Will change to use ksize().

Just pushed the following commit to address the issue:
https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git/commit/?id=1e660f7ebe0ff6ac65ee0000280392d878630a67

It will get to net-next soon.