From b7cf2a1d9881823133acc48427815a48b35b49f4 Mon Sep 17 00:00:00 2001 From: Barry Song Date: Tue, 19 Mar 2024 14:09:20 +1300 Subject: [PATCH] xtensa: remove redundant flush_dcache_page and ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE macros xtensa's flush_dcache_page() can be a no-op sometimes. There is a generic implementation for this case in include/asm-generic/ cacheflush.h. #ifndef ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE static inline void flush_dcache_page(struct page *page) { } #define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 #endif So remove the superfluous flush_dcache_page() definition, which also helps silence potential build warnings complaining the page variable passed to flush_dcache_page() is not used. In file included from crypto/scompress.c:12: include/crypto/scatterwalk.h: In function 'scatterwalk_pagedone': include/crypto/scatterwalk.h:76:30: warning: variable 'page' set but not used [-Wunused-but-set-variable] 76 | struct page *page; | ^~~~ crypto/scompress.c: In function 'scomp_acomp_comp_decomp': >> crypto/scompress.c:174:38: warning: unused variable 'dst_page' [-Wunused-variable] 174 | struct page *dst_page = sg_page(req->dst); | The issue was originally reported on LoongArch by kernel test robot (Huacai fixed it on LoongArch), then reported by Guenter and me on xtensa. This patch also removes lots of redundant macros which have been defined by asm-generic/cacheflush.h. Cc: Huacai Chen Cc: Herbert Xu Reported-by: kernel test robot Closes: https://lore.kernel.org/oe-kbuild-all/202403091614.NeUw5zcv-lkp@intel.com/ Reported-by: Barry Song Closes: https://lore.kernel.org/all/CAGsJ_4yDk1+axbte7FKQEwD7X2oxUCFrEc9M5YOS1BobfDFXPA@mail.gmail.com/ Reported-by: Guenter Roeck Closes: https://lore.kernel.org/all/aaa8b7d7-5abe-47bf-93f6-407942436472@roeck-us.net/ Fixes: 77292bb8ca69 ("crypto: scomp - remove memcpy if sg_nents is 1 and pages are lowmem") Signed-off-by: Barry Song Message-Id: <20240319010920.125192-1-21cnbao@gmail.com> Signed-off-by: Max Filippov --- arch/xtensa/include/asm/cacheflush.h | 24 ++++++++---------------- 1 file changed, 8 insertions(+), 16 deletions(-) diff --git a/arch/xtensa/include/asm/cacheflush.h b/arch/xtensa/include/asm/cacheflush.h index 38bcecb0e457..a2b6bb5429f5 100644 --- a/arch/xtensa/include/asm/cacheflush.h +++ b/arch/xtensa/include/asm/cacheflush.h @@ -100,6 +100,10 @@ void flush_cache_range(struct vm_area_struct*, ulong, ulong); void flush_icache_range(unsigned long start, unsigned long end); void flush_cache_page(struct vm_area_struct*, unsigned long, unsigned long); +#define flush_cache_all flush_cache_all +#define flush_cache_range flush_cache_range +#define flush_icache_range flush_icache_range +#define flush_cache_page flush_cache_page #else #define flush_cache_all local_flush_cache_all #define flush_cache_range local_flush_cache_range @@ -136,20 +140,7 @@ void local_flush_cache_page(struct vm_area_struct *vma, #else -#define flush_cache_all() do { } while (0) -#define flush_cache_mm(mm) do { } while (0) -#define flush_cache_dup_mm(mm) do { } while (0) - -#define flush_cache_vmap(start,end) do { } while (0) -#define flush_cache_vmap_early(start,end) do { } while (0) -#define flush_cache_vunmap(start,end) do { } while (0) - -#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0 -#define flush_dcache_page(page) do { } while (0) - #define flush_icache_range local_flush_icache_range -#define flush_cache_page(vma, addr, pfn) do { } while (0) -#define flush_cache_range(vma, start, end) do { } while (0) #endif @@ -162,15 +153,14 @@ void local_flush_cache_page(struct vm_area_struct *vma, __invalidate_icache_range(start,(end) - (start)); \ } while (0) -#define flush_dcache_mmap_lock(mapping) do { } while (0) -#define flush_dcache_mmap_unlock(mapping) do { } while (0) - #if defined(CONFIG_MMU) && (DCACHE_WAY_SIZE > PAGE_SIZE) extern void copy_to_user_page(struct vm_area_struct*, struct page*, unsigned long, void*, const void*, unsigned long); extern void copy_from_user_page(struct vm_area_struct*, struct page*, unsigned long, void*, const void*, unsigned long); +#define copy_to_user_page copy_to_user_page +#define copy_from_user_page copy_from_user_page #else @@ -186,4 +176,6 @@ extern void copy_from_user_page(struct vm_area_struct*, struct page*, #endif +#include + #endif /* _XTENSA_CACHEFLUSH_H */