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From: Byungchul Park <byungchul@sk.com>
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Subject: [RESEND PATCH v8 4/8] x86/tlb, mm/rmap: Separate arch_tlbbatch_clear() out of arch_tlbbatch_flush()
Date: Mon, 26 Feb 2024 12:06:09 +0900
Message-Id: <20240226030613.22366-5-byungchul@sk.com>
In-Reply-To: <20240226030613.22366-1-byungchul@sk.com>
References: <20240226030613.22366-1-byungchul@sk.com>
Precedence: bulk

This is a preparation for migrc mechanism that requires to avoid
redundant TLB flushes by manipulating tlb batch's arch data after
arch_tlbbatch_flush(). However, we cannot because the data is getting
cleared inside arch_tlbbatch_flush(). So separated the part clearing the
tlb batch's arch data out of arch_tlbbatch_flush().

Signed-off-by: Byungchul Park <byungchul@sk.com>
---
 arch/x86/mm/tlb.c | 2 --
 mm/rmap.c         | 1 +
 2 files changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index 453ea95b667d..941f41df02f3 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -1268,8 +1268,6 @@ void arch_tlbbatch_flush(struct arch_tlbflush_unmap_batch *batch)
 		local_irq_enable();
 	}
 
-	cpumask_clear(&batch->cpumask);
-
 	put_flush_tlb_info();
 	put_cpu();
 }
diff --git a/mm/rmap.c b/mm/rmap.c
index da36f23ff7b0..b484d659d0c1 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -643,6 +643,7 @@ void try_to_unmap_flush(void)
 		return;
 
 	arch_tlbbatch_flush(&tlb_ubc->arch);
+	arch_tlbbatch_clear(&tlb_ubc->arch);
 	tlb_ubc->flush_required = false;
 	tlb_ubc->writable = false;
 }
-- 
2.17.1