[PATCH v2 2/5] x86/mm: Share the full TLB flush dispatch

[Chuyi Zhou]

flush_tlb_all() and kernel_tlb_flush_all() select the same INVLPGB or
IPI backend and account for the same sender-side event. Keeping two
implementations duplicates the backend selection and accounting.

Use flush_tlb_all() for kernel ranges promoted to a full flush and
remove kernel_tlb_flush_all(). Share the existing backend dispatch and
event accounting so each request is counted once.

Signed-off-by: Chuyi Zhou <zhouchuyi@xxxxxxxxxxxxx>
---
 arch/x86/mm/tlb.c | 12 +-----------
 1 file changed, 1 insertion(+), 11 deletions(-)

diff --git a/arch/x86/mm/tlb.c b/arch/x86/mm/tlb.c
index da7c408f921c..5a1b96c61050 100644
--- a/arch/x86/mm/tlb.c
+++ b/arch/x86/mm/tlb.c
@@ -1486,16 +1486,6 @@ static void do_kernel_range_flush(void *info)
 		flush_tlb_one_kernel(addr);
 }
 
-static void kernel_tlb_flush_all(struct flush_tlb_info *info)
-{
-	count_vm_tlb_event(NR_TLB_REMOTE_FLUSH);
-
-	if (cpu_feature_enabled(X86_FEATURE_INVLPGB))
-		invlpgb_flush_all();
-	else
-		on_each_cpu(do_flush_tlb_all, NULL, 1);
-}
-
 static void kernel_tlb_flush_range(struct flush_tlb_info *info)
 {
 	count_vm_tlb_event(NR_TLB_REMOTE_FLUSH);
@@ -1515,7 +1505,7 @@ void flush_tlb_kernel_range(unsigned long start, unsigned long end)
 			    TLB_GENERATION_INVALID);
 
 	if (info.end == TLB_FLUSH_ALL)
-		kernel_tlb_flush_all(&info);
+		flush_tlb_all();
 	else
 		kernel_tlb_flush_range(&info);
 }
-- 
2.20.1