On Mon, Sep 12, 2016 at 04:57:58AM +0000, Sepherosa Ziehau wrote: > Author: sephe > Date: Mon Sep 12 04:57:58 2016 > New Revision: 305722 > URL: https://svnweb.freebsd.org/changeset/base/305722 > > Log: > x86: Use sx lock for interrupt sources. > > - Certain pic_assign_cpu, e.g. msi_assign_cpu can have quite a long > call chain. For msi_assign_cpu, mutex makes complex PCI bridge > drivers more tricky, e.g. sleep can note be called, etc, it will > be pretty tricky for upcoming Hyper-V PCI bridge driver for PCI > pass-through.
> - It is not used on any hot code path nor non-sleepable context, so > sx should have the same effect as mutex. Did you tested ACPI_DMAR interrupt remapping mode with your patch and witness enabled ? > > PIC list is still protected by mutex to keep suspend/resume work. _______________________________________________ svn-src-head@freebsd.org mailing list https://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
