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From: Sasha Levin <Alexander.Levin@microsoft.com>
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	Namhyung Kim <namhyung@kernel.org>, "joro@8bytes.org" <joro@8bytes.org>,
	Sasha Levin <Alexander.Levin@microsoft.com>
Subject: [PATCH AUTOSEL 4.9 27/62] x86/mm: Remove in_nmi() warning from
 vmalloc_fault()
Date: Sun, 2 Sep 2018 13:14:36 +0000
Message-ID: <20180902131411.183978-17-alexander.levin@microsoft.com>
References: <20180902131411.183978-1-alexander.levin@microsoft.com>
In-Reply-To: <20180902131411.183978-1-alexander.levin@microsoft.com>
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From: Joerg Roedel <jroedel@suse.de>

[ Upstream commit 6863ea0cda8725072522cd78bda332d9a0b73150 ]

It is perfectly okay to take page-faults, especially on the
vmalloc area while executing an NMI handler. Remove the
warning.

Signed-off-by: Joerg Roedel <jroedel@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Tested-by: David H. Gutteridge <dhgutteridge@sympatico.ca>
Cc: "H . Peter Anvin" <hpa@zytor.com>
Cc: linux-mm@kvack.org
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Juergen Gross <jgross@suse.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Jiri Kosina <jkosina@suse.cz>
Cc: Boris Ostrovsky <boris.ostrovsky@oracle.com>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: David Laight <David.Laight@aculab.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Eduardo Valentin <eduval@amazon.com>
Cc: Greg KH <gregkh@linuxfoundation.org>
Cc: Will Deacon <will.deacon@arm.com>
Cc: aliguori@amazon.com
Cc: daniel.gruss@iaik.tugraz.at
Cc: hughd@google.com
Cc: keescook@google.com
Cc: Andrea Arcangeli <aarcange@redhat.com>
Cc: Waiman Long <llong@redhat.com>
Cc: Pavel Machek <pavel@ucw.cz>
Cc: Arnaldo Carvalho de Melo <acme@kernel.org>
Cc: Alexander Shishkin <alexander.shishkin@linux.intel.com>
Cc: Jiri Olsa <jolsa@redhat.com>
Cc: Namhyung Kim <namhyung@kernel.org>
Cc: joro@8bytes.org
Link: https://lkml.kernel.org/r/1532533683-5988-2-git-send-email-joro@8byte=
s.org
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
---
 arch/x86/mm/fault.c | 2 --
 1 file changed, 2 deletions(-)

diff --git a/arch/x86/mm/fault.c b/arch/x86/mm/fault.c
index acef3c6a32a2..5c419b8f99a0 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -330,8 +330,6 @@ static noinline int vmalloc_fault(unsigned long address=
)
 	if (!(address >=3D VMALLOC_START && address < VMALLOC_END))
 		return -1;
=20
-	WARN_ON_ONCE(in_nmi());
-
 	/*
 	 * Synchronize this task's top level page-table
 	 * with the 'reference' page table.
--=20
2.17.1