This is a preparation for migrc mechanism that requires to manipulate
tlb batch's arch data. Even though arm64 does nothing for it, arch
with CONFIG_ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH should provide the APIs.
Signed-off-by: Byungchul Park <[email protected]>
---
arch/arm64/include/asm/tlbflush.h | 18 ++++++++++++++++++
1 file changed, 18 insertions(+)
diff --git a/arch/arm64/include/asm/tlbflush.h b/arch/arm64/include/asm/tlbflush.h
index a75de2665d84..b8c7fbc1c68e 100644
--- a/arch/arm64/include/asm/tlbflush.h
+++ b/arch/arm64/include/asm/tlbflush.h
@@ -347,6 +347,24 @@ static inline void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch)
dsb(ish);
}
+static inline void arch_tlbbatch_clear(struct arch_tlbflush_unmap_batch *batch)
+{
+ /* nothing to do */
+}
+
+static inline void arch_tlbbatch_fold(struct arch_tlbflush_unmap_batch *bdst,
+ struct arch_tlbflush_unmap_batch *bsrc)
+{
+ /* nothing to do */
+}
+
+static inline bool arch_tlbbatch_done(struct arch_tlbflush_unmap_batch *bdst,
+ struct arch_tlbflush_unmap_batch *bsrc)
+{
+ /* Kernel can consider tlb batch always has been done. */
+ return true;
+}
+
/*
* This is meant to avoid soft lock-ups on large TLB flushing ranges and not
* necessarily a performance improvement.
--
2.17.1