linux-kernel - [tip:x86/pti] x86/mm: Remove in_nmi() warning from vmalloc

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Date:   Mon, 30 Jul 2018 04:57:52 -0700
From:   tip-bot for Joerg Roedel <tipbot@...or.com>
To:     linux-tip-commits@...r.kernel.org
Cc:     will.deacon@....com, tglx@...utronix.de, jroedel@...e.de,
        gregkh@...uxfoundation.org, jkosina@...e.cz,
        linux-kernel@...r.kernel.org, boris.ostrovsky@...cle.com,
        bp@...en8.de, namhyung@...nel.org, torvalds@...ux-foundation.org,
        hpa@...or.com, dave.hansen@...el.com, dhgutteridge@...patico.ca,
        eduval@...zon.com, dvlasenk@...hat.com,
        alexander.shishkin@...ux.intel.com, acme@...nel.org,
        jgross@...e.com, llong@...hat.com, mingo@...nel.org,
        peterz@...radead.org, jpoimboe@...hat.com, aarcange@...hat.com,
        pavel@....cz, jolsa@...hat.com, David.Laight@...lab.com,
        brgerst@...il.com, luto@...nel.org
Subject: [tip:x86/pti] x86/mm: Remove in_nmi() warning from vmalloc_fault()

Commit-ID:  6863ea0cda8725072522cd78bda332d9a0b73150
Gitweb:     https://git.kernel.org/tip/6863ea0cda8725072522cd78bda332d9a0b73150
Author:     Joerg Roedel <jroedel@...e.de>
AuthorDate: Wed, 25 Jul 2018 17:48:01 +0200
Committer:  Thomas Gleixner <tglx@...utronix.de>
CommitDate: Mon, 30 Jul 2018 13:53:48 +0200

x86/mm: Remove in_nmi() warning from vmalloc_fault()

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@...e.de>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Tested-by: David H. Gutteridge <dhgutteridge@...patico.ca>
Cc: "H . Peter Anvin" <hpa@...or.com>
Cc: linux-mm@...ck.org
Cc: Linus Torvalds <torvalds@...ux-foundation.org>
Cc: Andy Lutomirski <luto@...nel.org>
Cc: Dave Hansen <dave.hansen@...el.com>
Cc: Josh Poimboeuf <jpoimboe@...hat.com>
Cc: Juergen Gross <jgross@...e.com>
Cc: Peter Zijlstra <peterz@...radead.org>
Cc: Borislav Petkov <bp@...en8.de>
Cc: Jiri Kosina <jkosina@...e.cz>
Cc: Boris Ostrovsky <boris.ostrovsky@...cle.com>
Cc: Brian Gerst <brgerst@...il.com>
Cc: David Laight <David.Laight@...lab.com>
Cc: Denys Vlasenko <dvlasenk@...hat.com>
Cc: Eduardo Valentin <eduval@...zon.com>
Cc: Greg KH <gregkh@...uxfoundation.org>
Cc: Will Deacon <will.deacon@....com>
Cc: aliguori@...zon.com
Cc: daniel.gruss@...k.tugraz.at
Cc: hughd@...gle.com
Cc: keescook@...gle.com
Cc: Andrea Arcangeli <aarcange@...hat.com>
Cc: Waiman Long <llong@...hat.com>
Cc: Pavel Machek <pavel@....cz>
Cc: Arnaldo Carvalho de Melo <acme@...nel.org>
Cc: Alexander Shishkin <alexander.shishkin@...ux.intel.com>
Cc: Jiri Olsa <jolsa@...hat.com>
Cc: Namhyung Kim <namhyung@...nel.org>
Cc: joro@...tes.org
Link: https://lkml.kernel.org/r/1532533683-5988-2-git-send-email-joro@8bytes.org

---
 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 2aafa6ab6103..db1c042e9853 100644
--- a/arch/x86/mm/fault.c
+++ b/arch/x86/mm/fault.c
@@ -317,8 +317,6 @@ static noinline int vmalloc_fault(unsigned long address)
 	if (!(address >= VMALLOC_START && address < VMALLOC_END))
 		return -1;

-	WARN_ON_ONCE(in_nmi());
-
 	/*
 	 * Synchronize this task's top level page-table
 	 * with the 'reference' page table.