1805_mm-disable-CONFIG-PER-VMA-LOCK-by-def.patch


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Subject: [PATCH 1/1] mm: disable CONFIG_PER_VMA_LOCK by default until its fixed
Date: Mon,  3 Jul 2023 11:21:50 -0700	[thread overview]
Message-ID: <20230703182150.2193578-1-surenb@google.com> (raw)

A memory corruption was reported in [1] with bisection pointing to the
patch [2] enabling per-VMA locks for x86.
Disable per-VMA locks config to prevent this issue while the problem is
being investigated. This is expected to be a temporary measure.

[1] https://bugzilla.kernel.org/show_bug.cgi?id=217624
[2] https://lore.kernel.org/all/20230227173632.3292573-30-surenb@google.com

Reported-by: Jiri Slaby <jirislaby@kernel.org>
Reported-by: Jacob Young <jacobly.alt@gmail.com>
Fixes: 0bff0aaea03e ("x86/mm: try VMA lock-based page fault handling first")
Signed-off-by: Suren Baghdasaryan <surenb@google.com>
---
 mm/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/mm/Kconfig b/mm/Kconfig
index 09130434e30d..de94b2497600 100644
--- a/mm/Kconfig
+++ b/mm/Kconfig
@@ -1224,7 +1224,7 @@ config ARCH_SUPPORTS_PER_VMA_LOCK
        def_bool n
 
 config PER_VMA_LOCK
-	def_bool y
+	bool "Enable per-vma locking during page fault handling."
 	depends on ARCH_SUPPORTS_PER_VMA_LOCK && MMU && SMP
 	help
 	  Allow per-vma locking during page fault handling.
-- 
2.41.0.255.g8b1d071c50-goog