Hi all,

[Cc'd Andrew Morton]

On Sun, 6 Dec 2020 01:22:07 +0800 Hui Su <sh_def@163.com> wrote:
>
> When I build kernel with ARCH=arm64, the building errors came out like
> this:
>   CC      mm/kfence/core.o
> In file included from ../mm/kfence/core.c:21:
> ../arch/arm64/include/asm/kfence.h: In function ‘kfence_protect_page’:
> ../arch/arm64/include/asm/kfence.h:12:2: error: implicit declaration of
> function ‘set_memory_valid’ [-Werror=implicit-function-declaration]
>    12 |  set_memory_valid(addr, 1, !protect);
>       |  ^~~~~~~~~~~~~~~~
> cc1: some warnings being treated as errors
> 
> which introduced by commit d54febeba2ff ("kfence: use pt_regs to
> generate stack trace on faults").
> 
> Signed-off-by: Hui Su <sh_def@163.com>
> ---
>  arch/arm64/include/asm/kfence.h | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/arch/arm64/include/asm/kfence.h b/arch/arm64/include/asm/kfence.h
> index 6c0afeeab635..4d73e34da59d 100644
> --- a/arch/arm64/include/asm/kfence.h
> +++ b/arch/arm64/include/asm/kfence.h
> @@ -4,6 +4,7 @@
>  #define __ASM_KFENCE_H
>  
>  #include <asm/cacheflush.h>
> +#include <linux/set_memory.h>
>  
>  static inline bool arch_kfence_init_pool(void) { return true; }
>  
> -- 
> 2.25.1

Added to linux-next today.  I think it actually fixes patch "arm64,
kfence: enable KFENCE for ARM64" since that actually introduces the
set_memory_valid() call?

-- 
Cheers,
Stephen Rothwell