[3/3] RISC-V: Add DEBUG_TLBFLUSH option.

[Atish Patra]

The TLB flush counters under vmstat seems to be very helpful while
debugging TLB flush performance in RISC-V.

Add the Kconfig option only for debug kernels.

Signed-off-by: Atish Patra <atish.patra@xxxxxxx>
---
 arch/riscv/Kconfig.debug | 12 ++++++++++++
 1 file changed, 12 insertions(+)

diff --git a/arch/riscv/Kconfig.debug b/arch/riscv/Kconfig.debug
index e69de29bb2d1..6a2d3762aeda 100644
--- a/arch/riscv/Kconfig.debug
+++ b/arch/riscv/Kconfig.debug
@@ -0,0 +1,12 @@
+# SPDX-License-Identifier: GPL-2.0
+
+config DEBUG_TLBFLUSH
+	bool "Save tlb flush statstics to vmstat"
+	depends on DEBUG_KERNEL
+	help
+
+	Add TLB flush statstics to vmstat. It is really helpful understand tlbflush
+	performance and behavior. It should be enabled only for debugging purpose.
+
+	If in doubt, say "N".
+
-- 
2.21.0