Re: [PATCH v9 46/96] mm: Add flush_dcache_folio

From: Matthew Wilcox
Date: Wed May 05 2021 - 22:34:00 EST

On Thu, May 06, 2021 at 07:35:16AM +0800, kernel test robot wrote:
> In file included from arch/ia64/include/asm/cacheflush.h:31,
> from arch/ia64/include/asm/pgtable.h:153,
> from include/linux/pgtable.h:6,
> from arch/ia64/include/asm/uaccess.h:40,
> from include/linux/uaccess.h:11,
> from include/linux/sched/task.h:11,
> from include/linux/sched/signal.h:9,
> from arch/ia64/kernel/asm-offsets.c:10:
> include/asm-generic/cacheflush.h: In function 'flush_dcache_folio':
> >> include/asm-generic/cacheflush.h:61:19: error: implicit declaration of function 'folio_nr_pages'; did you mean 'folio_page'? [-Werror=implicit-function-declaration]

Ugh, I can't be bothered to untangle the ia64 header file mess.
I'll just move the function out of line.