On Mon, 29 Jun 2026 16:58:34 +0800 kernel test robot <[email protected]> wrote:
> tree: https://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm.git mm-new > head: 88cefc306c43b58d9bb65c9e96e284306710d961 > commit: 80c453511b6ee1af0e4db83c3db0020215c4eaf0 [59/142] mm/vmalloc: map > contiguous pages in batches for vmap() if possible > config: csky-allnoconfig > (https://download.01.org/0day-ci/archive/20260629/[email protected]/config) > compiler: csky-linux-gcc (GCC) 16.1.0 > reproduce (this is a W=1 build): > (https://download.01.org/0day-ci/archive/20260629/[email protected]/reproduce) > > If you fix the issue in a separate patch/commit (i.e. not just a new version > of > the same patch/commit), kindly add following tags > | Reported-by: kernel test robot <[email protected]> > | Closes: > https://lore.kernel.org/oe-kbuild-all/[email protected]/ > > All warnings (new ones prefixed by >>): > > mm/vmalloc.c: In function 'vmap_batched': > >> mm/vmalloc.c:3590:23: warning: unused variable 'start' [-Wunused-variable] > 3590 | unsigned long start = addr, map_addr = addr; > | ^~~~~ Sigh. unsigned long start = addr, map_addr = addr; ... flush_cache_vmap(start, end); See, this is our punishment for writing kernel code in CPP rather than in C. I'll queue (and test) the below. It should be OK - arch/csky/abiv1/inc/abi/cacheflush.h directly includes asm/cache.h which declares cache_wbinv_all(). From: Andrew Morton <[email protected]> Subject: csky: implement flush_cache_vmap() in C Date: Mon Jun 29 05:07:51 PM PDT 2026 To avoid getting an unused-var warning from unsigned long start = something; ... flush_cache_vmap(start, ...); Cc: Guo Ren <[email protected]> Cc: Andrew Donnellan <[email protected]> Cc: Anshuman Khandual <[email protected]> Cc: "Barry Song (Xiaomi)" <[email protected]> Cc: Catalin Marinas <[email protected]> Cc: David Hildenbrand <[email protected]> Cc: Dev Jain <[email protected]> Cc: Leo Yan <[email protected]> Cc: Mike Rapoport <[email protected]> Cc: Ryan Roberts <[email protected]> Cc: Uladzislau Rezki <[email protected]> Cc: Wen Jiang <[email protected]> Cc: Wen Jiang <[email protected]> Cc: Will Deacon <[email protected]> Cc: Xueyuan Chen <[email protected]> Signed-off-by: Andrew Morton <[email protected]> --- arch/csky/abiv1/inc/abi/cacheflush.h | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/arch/csky/abiv1/inc/abi/cacheflush.h~csky-implement-flush_cache_vmap-in-c +++ a/arch/csky/abiv1/inc/abi/cacheflush.h @@ -42,7 +42,12 @@ static inline void flush_anon_page(struc * Use cache_wbinv_all() here and need to be improved in future. */ extern void flush_cache_range(struct vm_area_struct *vma, unsigned long start, unsigned long end); -#define flush_cache_vmap(start, end) cache_wbinv_all() + +static inline void flush_cache_vmap(unsigned long start, unsigned long end) +{ + cache_wbinv_all(); +} + #define flush_cache_vmap_early(start, end) do { } while (0) #define flush_cache_vunmap(start, end) cache_wbinv_all() _
