On Mon, Jan 04, 2016 at 03:27:57PM +0200, Tero Kristo wrote: > On 01/04/2016 12:21 PM, Geert Uytterhoeven wrote: > >FWIW, there are small loops with just a cpu_relax() in various clock drivers > >under drivers/clk/shmobile/. > > Just did a quick profiling round, and the clk_enable/disable delay loops > take anything from 0...1500ns, most typically consuming some 400-600ns. So, > based on this, dropping the udelay and adding cpu_relax instead looks like a > good change. I just verified that changing the udelay to cpu_relax works > fine also, I just need to change the bail-out period to be something sane. Was that profiling done with lockdep/lock debugging enabled or disabled? -- RMK's Patch system: http://www.arm.linux.org.uk/developer/patches/ FTTC broadband for 0.8mile line: currently at 9.6Mbps down 400kbps up according to speedtest.net. -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
