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

From: Stephen Rothwell <[email-masked]>
Date: Wed, 16 Oct 2024 17:05:42 +1100

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.

-- 
Cheers,
Stephen Rothwell