Re: [PATCH 1/2] asm-generic/nds32: don't redefine cacheflush primitives

Greentime Hu
2019-12-24T02:13:53Z

Mike Rapoport <rppt@kernel.org> 於 2019年12月23日 週一 下午7:00寫道：
>
> From: Mike Rapoport <rppt@linux.ibm.com>
>
> The commit c296d4dc13ae ("asm-generic: fix a compilation warning") changed
> asm-generic/cachflush.h to use static inlines instead of macros and as a
> result the nds32 build with CONFIG_CPU_CACHE_ALIASING=n fails:
>
> CC init/main.o
> In file included from arch/nds32/include/asm/cacheflush.h:43,
> from include/linux/highmem.h:12,
> from include/linux/pagemap.h:11,
> from include/linux/blkdev.h:16,
> from include/linux/blk-cgroup.h:23,
> from include/linux/writeback.h:14,
> from init/main.c:44:
> include/asm-generic/cacheflush.h:50:20: error: static declaration of 'flush_icache_range' follows non-static declaration
> static inline void flush_icache_range(unsigned long start, unsigned long end)
> ^~~~~~~~~~~~~~~~~~
> In file included from include/linux/highmem.h:12,
> from include/linux/pagemap.h:11,
> from include/linux/blkdev.h:16,
> from include/linux/blk-cgroup.h:23,
> from include/linux/writeback.h:14,
> from init/main.c:44:
> arch/nds32/include/asm/cacheflush.h:11:6: note: previous declaration of 'flush_icache_range' was here
> void flush_icache_range(unsigned long start, unsigned long end);
> ^~~~~~~~~~~~~~~~~~
>
> Surround the inline functions in asm-generic/cacheflush.h by ifdef's so
> that architectures could override them and add the required overrides to
> nds32.
>
> Fixes: c296d4dc13ae ("asm-generic: fix a compilation warning")
> Link: https://lore.kernel.org/lkml/201912212139.yptX8CsV%25lkp@intel.com/
> Reported-by: kbuild test robot <lkp@intel.com>
> Signed-off-by: Mike Rapoport <rppt@linux.ibm.com>
> ---
> arch/nds32/include/asm/cacheflush.h | 11 ++++++----
> include/asm-generic/cacheflush.h | 33 ++++++++++++++++++++++++++++-
> 2 files changed, 39 insertions(+), 5 deletions(-)
>
> diff --git a/arch/nds32/include/asm/cacheflush.h b/arch/nds32/include/asm/cacheflush.h
> index d9ac7e6408ef..caddded56e77 100644
> --- a/arch/nds32/include/asm/cacheflush.h
> +++ b/arch/nds32/include/asm/cacheflush.h
> @@ -9,7 +9,11 @@
> #define PG_dcache_dirty PG_arch_1
>
> void flush_icache_range(unsigned long start, unsigned long end);
> +#define flush_icache_range flush_icache_range
> +
> void flush_icache_page(struct vm_area_struct *vma, struct page *page);
> +#define flush_icache_page flush_icache_page
> +
> #ifdef CONFIG_CPU_CACHE_ALIASING
> void flush_cache_mm(struct mm_struct *mm);
> void flush_cache_dup_mm(struct mm_struct *mm);
> @@ -40,12 +44,11 @@ void invalidate_kernel_vmap_range(void *addr, int size);
> #define flush_dcache_mmap_unlock(mapping) xa_unlock_irq(&(mapping)->i_pages)
>
> #else
> -#include <asm-generic/cacheflush.h>
> -#undef flush_icache_range
> -#undef flush_icache_page
> -#undef flush_icache_user_range
> void flush_icache_user_range(struct vm_area_struct *vma, struct page *page,
> unsigned long addr, int len);
> +#define flush_icache_user_range flush_icache_user_range
> +
> +#include <asm-generic/cacheflush.h>
> #endif
>
> #endif /* __NDS32_CACHEFLUSH_H__ */
> diff --git a/include/asm-generic/cacheflush.h b/include/asm-generic/cacheflush.h
> index a950a22c4890..cac7404b2bdd 100644
> --- a/include/asm-generic/cacheflush.h
> +++ b/include/asm-generic/cacheflush.h
> @@ -11,71 +11,102 @@
> * The cache doesn't need to be flushed when TLB entries change when
> * the cache is mapped to physical memory, not virtual memory
> */
> +#ifndef flush_cache_all
> static inline void flush_cache_all(void)
> {
> }
> +#endif
>
> +#ifndef flush_cache_mm
> static inline void flush_cache_mm(struct mm_struct *mm)
> {
> }
> +#endif
>
> +#ifndef flush_cache_dup_mm
> static inline void flush_cache_dup_mm(struct mm_struct *mm)
> {
> }
> +#endif
>
> +#ifndef flush_cache_range
> static inline void flush_cache_range(struct vm_area_struct *vma,
> unsigned long start,
> unsigned long end)
> {
> }
> +#endif
>
> +#ifndef flush_cache_page
> static inline void flush_cache_page(struct vm_area_struct *vma,
> unsigned long vmaddr,
> unsigned long pfn)
> {
> }
> +#endif
>
> +#ifndef flush_dcache_page
> static inline void flush_dcache_page(struct page *page)
> {
> }
> +#endif
>
> +#ifndef flush_dcache_mmap_lock
> static inline void flush_dcache_mmap_lock(struct address_space *mapping)
> {
> }
> +#endif
>
> +#ifndef flush_dcache_mmap_unlock
> static inline void flush_dcache_mmap_unlock(struct address_space *mapping)
> {
> }
> +#endif
>
> +#ifndef flush_icache_range
> static inline void flush_icache_range(unsigned long start, unsigned long end)
> {
> }
> +#endif
>
> +#ifndef flush_icache_page
> static inline void flush_icache_page(struct vm_area_struct *vma,
> struct page *page)
> {
> }
> +#endif
>
> +#ifndef flush_icache_user_range
> static inline void flush_icache_user_range(struct vm_area_struct *vma,
> struct page *page,
> unsigned long addr, int len)
> {
> }
> +#endif
>
> +#ifndef flush_cache_vmap
> static inline void flush_cache_vmap(unsigned long start, unsigned long end)
> {
> }
> +#endif
>
> +#ifndef flush_cache_vunmap
> static inline void flush_cache_vunmap(unsigned long start, unsigned long end)
> {
> }
> +#endif
>
> -#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
> +#ifndef copy_to_user_page
> +#define copy_to_user_page(vma, page, vaddr, dst, src, len) \
> do { \
> memcpy(dst, src, len); \
> flush_icache_user_range(vma, page, vaddr, len); \
> } while (0)
> +#endif
> +
> +#ifndef copy_from_user_page
> #define copy_from_user_page(vma, page, vaddr, dst, src, len) \
> memcpy(dst, src, len)
> +#endif
>
> #endif /* __ASM_CACHEFLUSH_H */

Thank you, Mike.
Reviewed-by: Greentime Hu <green.hu@gmail.com>