Re: [PATCH v2 4/4] ARC: don't check for HIGHMEM pages in arch_dma_alloc

2018-07-31 Thread Christoph Hellwig
On Mon, Jul 30, 2018 at 07:26:36PM +0300, Eugeniy Paltsev wrote: > __GFP_HIGHMEM flag is cleared by upper layer functions > (in include/linux/dma-mapping.h) so we'll never get a > __GFP_HIGHMEM flag in arch_dma_alloc gfp argument. > That's why alloc_pages will never return highmem page > here. > >

ARC show_regs() triggers preempt debug splat, lockdep

2018-07-31 Thread Vineet Gupta
Hi Peter, Al, Reaching out about a problem I understand, but not quite sure how to fix it. Its the weird feeling of how was this working all along, if at all. With print-fatal-signals enabled, there's CONFIG_DEBUG_PREEMPT splat all over, even with a simple single threaded segv inducing program (c

Re: ARC show_regs() triggers preempt debug splat, lockdep

2018-07-31 Thread Vineet Gupta
On 07/31/2018 02:26 PM, Vineet Gupta wrote: > Hi Peter, Al, > > Reaching out about a problem I understand, but not quite sure how to fix it. > Its the weird feeling of how was this working all along, if at all. > > With print-fatal-signals enabled, there's CONFIG_DEBUG_PREEMPT splat all over, > e