linux-kernel - [PATCH 08/11] arch,mm: add config variable to skip lazy TLB mm refcounting

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Message-Id: <20180801100255.4278-9-riel@surriel.com>
Date:   Wed,  1 Aug 2018 06:02:52 -0400
From:   Rik van Riel <riel@...riel.com>
To:     linux-kernel@...r.kernel.org
Cc:     kernel-team@...com, mingo@...nel.org, peterz@...radead.org,
        luto@...nel.org, x86@...nel.org, efault@....de,
        dave.hansen@...el.com, Rik van Riel <riel@...riel.com>
Subject: [PATCH 08/11] arch,mm: add config variable to skip lazy TLB mm refcounting

Add a config variable indicating that this architecture does not require
lazy TLB mm refcounting, because lazy TLB mms get shot down instantly
at exit_mmap time.

Signed-off-by: Rik van Riel <riel@...riel.com>
---
 arch/Kconfig | 4 ++++
 1 file changed, 4 insertions(+)

diff --git a/arch/Kconfig b/arch/Kconfig
index 1aa59063f1fd..1baf1a176dbf 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -237,6 +237,10 @@ config ARCH_HAS_FORTIFY_SOURCE
 config ARCH_HAS_SET_MEMORY
 	bool
 
+# Select if arch shoots down lazy TLB mms at exit time, instead of refcounting
+config ARCH_NO_ACTIVE_MM_REFCOUNTING
+	bool
+
 # Select if arch init_task must go in the __init_task_data section
 config ARCH_TASK_STRUCT_ON_STACK
        bool
-- 
2.14.4