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    Subject[PATCH AUTOSEL 4.9 27/62] x86/mm: Remove in_nmi() warning from vmalloc_fault()
    Date
    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@8bytes.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 >= 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.
    --
    2.17.1
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