arm kernel oops in highmem.c with 4.2

[Nicolas Pitre]

On Wed, 12 Aug 2015, Mark Salter wrote:

> On Tue, 2015-08-11 at 22:18 -0400, Nicolas Pitre wrote:
> > On Tue, 11 Aug 2015, Mark Salter wrote:
> > 
> > > On Tue, 2015-08-11 at 16:20 -0400, Nicolas Pitre wrote:
> > > > diff --git a/arch/arm/lib/uaccess_with_memcpy.c 
> > > > b/arch/arm/lib/uaccess_with_memcpy.c
> > > > index 3e58d71001..4b39af2dfd 100644
> > > > --- a/arch/arm/lib/uaccess_with_memcpy.c
> > > > +++ b/arch/arm/lib/uaccess_with_memcpy.c
> > > > @@ -96,7 +96,7 @@ __copy_to_user_memcpy(void __user *to, const void 
> > > > *from, unsigned long n)
> > > >  	}
> > > >  
> > > >  	/* the mmap semaphore is taken only if not in an atomic 
> > > > context 
> > > > */
> > > > -	atomic = in_atomic();
> > > > +	atomic = faulthandler_disabled();
> > > >  
> > > >  	if (!atomic)
> > > >  		down_read(&current->mm->mmap_sem);
> > > 
> > > Yeah, that fixes the problem I was seeing.
> > 
> > Good!  Then I'll add it to RMK's patch system.  May I add a tested-by 
> > tag with your name?
> 
> Yes

Queued as patch #8414/1.


Nicolas