linux-kernel - [PATCH] mm/userfaultfd: Disable userfaultfd-wp on x86

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Message-Id: <20200413141608.109211-1-peterx@redhat.com>
Date:   Mon, 13 Apr 2020 10:16:08 -0400
From:   Peter Xu <peterx@...hat.com>
To:     linux-kernel@...r.kernel.org, linux-mm@...ck.org
Cc:     peterx@...hat.com, Andrew Morton <akpm@...ux-foundation.org>,
        Andrea Arcangeli <aarcange@...hat.com>,
        Hillf Danton <hdanton@...a.com>,
        Naresh Kamboju <naresh.kamboju@...aro.org>,
        kernel test robot <lkp@...el.com>
Subject: [PATCH] mm/userfaultfd: Disable userfaultfd-wp on x86_32

Userfaultfd-wp is not yet working on 32bit hosts, but it's
accidentally enabled previously.  Disable it.

Fixes: 5a281062af1d ("userfaultfd: wp: add WP pagetable tracking to x86")
Cc: Andrew Morton <akpm@...ux-foundation.org>
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Hillf Danton <hdanton@...a.com>
Reported-by: Naresh Kamboju <naresh.kamboju@...aro.org>
Reported-by: kernel test robot <lkp@...el.com>
Tested-by: Naresh Kamboju <naresh.kamboju@...aro.org>
Signed-off-by: Peter Xu <peterx@...hat.com>
---
 arch/x86/Kconfig | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 8d078642b4be..7a7d2db366a3 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -149,7 +149,7 @@ config X86
 	select HAVE_ARCH_TRACEHOOK
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE
 	select HAVE_ARCH_TRANSPARENT_HUGEPAGE_PUD if X86_64
-	select HAVE_ARCH_USERFAULTFD_WP		if USERFAULTFD
+	select HAVE_ARCH_USERFAULTFD_WP         if X86_64 && USERFAULTFD
 	select HAVE_ARCH_VMAP_STACK		if X86_64
 	select HAVE_ARCH_WITHIN_STACK_FRAMES
 	select HAVE_ASM_MODVERSIONS
-- 
2.24.1