On Mon, Mar 14, 2022 at 6:19 PM Arnd Bergmann <arnd@xxxxxxxx> wrote: > > On Mon, Mar 14, 2022 at 9:06 AM kernel test robot <lkp@xxxxxxxxx> wrote: > > > > If you fix the issue, kindly add following tag as appropriate > > Reported-by: kernel test robot <lkp@xxxxxxxxx> > > > > All errors (new ones prefixed by >>): > > > > >> arch/arm/mm/copypage-v4mc.c:70:3: error: implicit declaration of function '__flush_dcache_page' is invalid in C99 [-Werror,-Wimplicit-function-declaration] > > __flush_dcache_page(page_mapping_file(from), from); > > ^ > > arch/arm/mm/copypage-v4mc.c:70:3: note: did you mean 'flush_dcache_page'? > > arch/arm/include/asm/cacheflush.h:292:13: note: 'flush_dcache_page' declared here > > extern void flush_dcache_page(struct page *); > > ^ > > >> arch/arm/mm/copypage-v4mc.c:74:2: error: implicit declaration of function 'set_top_pte' is invalid in C99 [-Werror,-Wimplicit-function-declaration] > > I checked this, and found that the configuration was already broken, > what changed is just the > exact error message that gcc produces, so lkp flags it as a regression. Agree. Clang shows a slightly different error message with -std=gnu89/11. Old error message (with -std=gnu89): implicit declaration of function '__flush_dcache_page' [-Werror,-Wimplicit-function-declaration] New error message (with -std=gnu11) implicit declaration of function '__flush_dcache_page' is invalid in C99 [-Werror,-Wimplicit-function-declaration] This was already broken before. > This is a NOMMU StrongARM1100 config, which has been broken for a long time, > and already have a patch to disallow that configuration because we ran > into another > issue with NOMMU classic processors last week. > > Arnd -- Best Regards Masahiro Yamada
