linux-stable/include/asm-generic/cacheflush.h
Mike Rapoport ff60c02a97 asm-generic/nds32: don't redefine cacheflush primitives
commit 4f0bd80813 upstream.

The commit c296d4dc13 ("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: c296d4dc13 ("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>
Reviewed-by: Greentime Hu <green.hu@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-01-17 19:48:43 +01:00

112 lines
2.2 KiB
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __ASM_CACHEFLUSH_H
#define __ASM_CACHEFLUSH_H
/* Keep includes the same across arches. */
#include <linux/mm.h>
#define ARCH_IMPLEMENTS_FLUSH_DCACHE_PAGE 0
/*
* 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
#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 */