From f46ae1cd7ceccd98f3d280d6771ba1e9d03acd8d Mon Sep 17 00:00:00 2001 From: Jiri Kosina Date: Wed, 24 Apr 2019 09:04:57 +0200 Subject: [PATCH] x86/mm: Remove in_nmi() warning from 64-bit implementation of vmalloc_fault() [ Upstream commit a65c88e16f32aa9ef2e8caa68ea5c29bd5eb0ff0 ] In-NMI warnings have been added to vmalloc_fault() via: ebc8827f75 ("x86: Barf when vmalloc and kmemcheck faults happen in NMI") back in the time when our NMI entry code could not cope with nested NMIs. These days, it's perfectly fine to take a fault in NMI context and we don't have to care about the fact that IRET from the fault handler might cause NMI nesting. This warning has already been removed from 32-bit implementation of vmalloc_fault() in: 6863ea0cda8 ("x86/mm: Remove in_nmi() warning from vmalloc_fault()") but the 64-bit version was omitted. Remove the bogus warning also from 64-bit implementation of vmalloc_fault(). Reported-by: Nicolai Stange Signed-off-by: Jiri Kosina Acked-by: Peter Zijlstra (Intel) Cc: Andy Lutomirski Cc: Borislav Petkov Cc: Dave Hansen Cc: Frederic Weisbecker Cc: Joerg Roedel Cc: Linus Torvalds Cc: Peter Zijlstra Cc: Thomas Gleixner Fixes: 6863ea0cda8 ("x86/mm: Remove in_nmi() warning from vmalloc_fault()") Link: http://lkml.kernel.org/r/nycvar.YFH.7.76.1904240902280.9803@cbobk.fhfr.pm Signed-off-by: Ingo Molnar Signed-off-by: Sasha Levin --- 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 47bebfe..9d9765e 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -427,8 +427,6 @@ static noinline int vmalloc_fault(unsigned long address) if (!(address >= VMALLOC_START && address < VMALLOC_END)) return -1; - WARN_ON_ONCE(in_nmi()); - /* * Copy kernel mappings over when needed. This can also * happen within a race in page table update. In the later -- 2.7.4