[PATCH v3 14/18] arm64: __clean_dcache_area_pop to take end parameter instead of size

Fuad Tabba
2021-05-20T12:51:40Z

To be consistent with other functions with similar names and
functionality in cacheflush.h, cache.S, and cachetlb.rst, change
to specify the range in terms of start and end, as opposed to
start and size.

No functional change intended.

Reported-by: Will Deacon <will@kernel.org>
Signed-off-by: Fuad Tabba <tabba@google.com>
---
arch/arm64/include/asm/cacheflush.h | 2 +-
arch/arm64/lib/uaccess_flushcache.c | 4 ++--
arch/arm64/mm/cache.S | 9 ++++-----
arch/arm64/mm/flush.c | 2 +-
4 files changed, 8 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index 3255878d6f30..fa5641868d65 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -61,7 +61,7 @@ extern void invalidate_icache_range(unsigned long start, unsigned long end);
extern void __flush_dcache_area(unsigned long start, unsigned long end);
extern void __inval_dcache_area(unsigned long start, unsigned long end);
extern void __clean_dcache_area_poc(unsigned long start, unsigned long end);
-extern void __clean_dcache_area_pop(void *addr, size_t len);
+extern void __clean_dcache_area_pop(unsigned long start, unsigned long end);
extern void __clean_dcache_area_pou(void *addr, size_t len);
extern long __flush_cache_user_range(unsigned long start, unsigned long end);
extern void sync_icache_aliases(void *kaddr, unsigned long len);
diff --git a/arch/arm64/lib/uaccess_flushcache.c b/arch/arm64/lib/uaccess_flushcache.c
index c83bb5a4aad2..62ea989effe8 100644
--- a/arch/arm64/lib/uaccess_flushcache.c
+++ b/arch/arm64/lib/uaccess_flushcache.c
@@ -15,7 +15,7 @@ void memcpy_flushcache(void *dst, const void *src, size_t cnt)
* barrier to order the cache maintenance against the memcpy.
*/
memcpy(dst, src, cnt);
- __clean_dcache_area_pop(dst, cnt);
+ __clean_dcache_area_pop((unsigned long)dst, (unsigned long)dst + cnt);
}
EXPORT_SYMBOL_GPL(memcpy_flushcache);

@@ -33,6 +33,6 @@ unsigned long __copy_user_flushcache(void *to, const void __user *from,
rc = raw_copy_from_user(to, from, n);

/* See above */
- __clean_dcache_area_pop(to, n - rc);
+ __clean_dcache_area_pop((unsigned long)to, (unsigned long)to + n - rc);
return rc;
}
diff --git a/arch/arm64/mm/cache.S b/arch/arm64/mm/cache.S
index 9a9c44bb26d2..b72fbae4b8e9 100644
--- a/arch/arm64/mm/cache.S
+++ b/arch/arm64/mm/cache.S
@@ -201,16 +201,15 @@ SYM_FUNC_END_PI(__clean_dcache_area_poc)
SYM_FUNC_END(__dma_clean_area)

/*
- * __clean_dcache_area_pop(kaddr, size)
+ * __clean_dcache_area_pop(start, end)
*
- * Ensure that any D-cache lines for the interval [kaddr, kaddr+size)
+ * Ensure that any D-cache lines for the interval [start, end)
* are cleaned to the PoP.
*
- * - kaddr - kernel address
- * - size - size in question
+ * - start - virtual start address of region
+ * - end - virtual end address of region
*/
SYM_FUNC_START_PI(__clean_dcache_area_pop)
- add x1, x0, x1
alternative_if_not ARM64_HAS_DCPOP
b __clean_dcache_area_poc
alternative_else_nop_endif
diff --git a/arch/arm64/mm/flush.c b/arch/arm64/mm/flush.c
index 4e3505c2bea6..5aba7fe42d4b 100644
--- a/arch/arm64/mm/flush.c
+++ b/arch/arm64/mm/flush.c
@@ -82,7 +82,7 @@ void arch_wb_cache_pmem(void *addr, size_t size)
{
/* Ensure order against any prior non-cacheable writes */
dmb(osh);
- __clean_dcache_area_pop(addr, size);
+ __clean_dcache_area_pop((unsigned long)addr, (unsigned long)addr + size);
}
EXPORT_SYMBOL_GPL(arch_wb_cache_pmem);

--
2.31.1.751.gd2f1c929bd-goog