From: "Russell King (Oracle)" <rmk+kernel@xxxxxxxxxxxxxxx>
When we hook into the kernel text patching code, we will need to call
clean_dcache_range_nopatch() to ensure that the patching of the
replicated kernel text is properly visible to other CPUs. Make this
function available to the replication code.
Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx>
---
arch/arm64/include/asm/cacheflush.h | 2 ++
arch/arm64/kernel/alternative.c | 2 +-
2 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/arch/arm64/include/asm/cacheflush.h b/arch/arm64/include/asm/cacheflush.h
index fefac75fa009..f94255db1c75 100644
--- a/arch/arm64/include/asm/cacheflush.h
+++ b/arch/arm64/include/asm/cacheflush.h
@@ -104,6 +104,8 @@ static inline void flush_icache_range(unsigned long start, unsigned long end)
}
#define flush_icache_range flush_icache_range
+void clean_dcache_range_nopatch(u64 start, u64 end);
+
/*
* Copy user data from/to a page which is mapped into a different
* processes address space. Really, we want to allow our "user
diff --git a/arch/arm64/kernel/alternative.c b/arch/arm64/kernel/alternative.c
index 8ff6610af496..ea3f4104771d 100644
--- a/arch/arm64/kernel/alternative.c
+++ b/arch/arm64/kernel/alternative.c
@@ -121,7 +121,7 @@ static noinstr void patch_alternative(struct alt_instr *alt,
* accidentally call into the cache.S code, which is patched by us at
* runtime.
*/
-static noinstr void clean_dcache_range_nopatch(u64 start, u64 end)
+noinstr void clean_dcache_range_nopatch(u64 start, u64 end)
{
u64 cur, d_size, ctr_el0;
--
2.20.1
