On Wed 25-11-15 16:25:33, Peter Zijlstra wrote: > On Wed, Nov 25, 2015 at 04:08:11PM +0100, Vlastimil Babka wrote: > > Now I admit I have no idea if there are architectures that don't support jump > > labels *and* have an expensive atomic read, and whether we care? > > atomic_read() is basically always READ_ONCE(), there's a few archs that > implement it in asm with a 'weird' load instruction, but its still a > load. The worst is I think an uncached load for blackfin or somesuch. > > There's plenty archs that do not support the jump label bits, but > typically you don't care much about those. I'm not aware of an arch that > cannot fundamentally implement jump_label support if they wanted to. OK, I see. Thanks for the clarification! Then I do not have any objections. -- Michal Hocko SUSE Labs -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@xxxxxxxxx. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>