From: Jiri Kosina jkosina@suse.cz
[ 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 nstange@suse.de Signed-off-by: Jiri Kosina jkosina@suse.cz Acked-by: Peter Zijlstra (Intel) peterz@infradead.org Cc: Andy Lutomirski luto@kernel.org Cc: Borislav Petkov bp@alien8.de Cc: Dave Hansen dave.hansen@linux.intel.com Cc: Frederic Weisbecker fweisbec@gmail.com Cc: Joerg Roedel jroedel@suse.de Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Cc: Thomas Gleixner tglx@linutronix.de 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 mingo@kernel.org Signed-off-by: Sasha Levin sashal@kernel.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 794c35c4ca736..b162f92fd55cf 100644 --- a/arch/x86/mm/fault.c +++ b/arch/x86/mm/fault.c @@ -426,8 +426,6 @@ 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