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

From: Namhyung Kim <[email-masked]>
Date: Wed, 16 Oct 2024 11:35:18 -0700

On Wed, Oct 16, 2024 at 09:25:41AM -0700, Alexei Starovoitov wrote:
> On Tue, Oct 15, 2024 at 11:05 PM Stephen Rothwell <[email-masked]> wrote:
> >
> > Hi all,
> >
> > After merging the bpf-next tree, today's linux-next build (arm64
> > defconfig) failed like this:
> >
> > Building: arm64 defconfig
> > In file included from arch/arm64/include/asm/thread_info.h:17,
> >                  from include/linux/thread_info.h:60,
> >                  from arch/arm64/include/asm/preempt.h:6,
> >                  from include/linux/preempt.h:79,
> >                  from include/linux/spinlock.h:56,
> >                  from include/linux/mmzone.h:8,
> >                  from include/linux/gfp.h:7,
> >                  from include/linux/slab.h:16,
> >                  from mm/slab_common.c:7:
> > mm/slab_common.c: In function 'bpf_get_kmem_cache':
> > arch/arm64/include/asm/memory.h:427:66: error: passing argument 1 of 'virt_to_pfn' makes pointer from integer without a cast [-Wint-conversion]
> >   427 |         __is_lm_address(__addr) && pfn_is_map_memory(virt_to_pfn(__addr));      \
> >       |                                                                  ^~~~~~
> >       |                                                                  |
> >       |                                                                  u64 {aka long long unsigned int}
> > mm/slab_common.c:1260:14: note: in expansion of macro 'virt_addr_valid'
> >  1260 |         if (!virt_addr_valid(addr))
> >       |              ^~~~~~~~~~~~~~~
> > arch/arm64/include/asm/memory.h:382:53: note: expected 'const void *' but argument is of type 'u64' {aka 'long long unsigned int'}
> >   382 | static inline unsigned long virt_to_pfn(const void *kaddr)
> >       |                                         ~~~~~~~~~~~~^~~~~
> >
> > Caused by commit
> >
> >   04b069ff0181 ("mm/bpf: Add bpf_get_kmem_cache() kfunc")
> >
> > I have reverted commit
> >
> >   08c837461891 ("Merge branch 'bpf-add-kmem_cache-iterator-and-kfunc'")
> >
> > for today.
> 
> Thanks for flagging.
> Fixed and force pushed.

Oops, thanks for fixing this.  The virt_addr_valid() was confusing
whether it takes unsigned long or a pointer.  It seems each arch has
different expectation.

Thanks,
Namhyung