On Monday, September 13, 2010 2:48:23 pm Matthew D Fleming wrote: > Author: mdf > Date: Mon Sep 13 18:48:23 2010 > New Revision: 212572 > URL: http://svn.freebsd.org/changeset/base/212572 > > Log: > Revert r212370, as it causes a LOR on powerpc. powerpc does a few > unexpected things in copyout(9) and so wiring the user buffer is not > sufficient to perform a copyout(9) while holding a random mutex. > > Requested by: nwhitehorn
Hmmm, that is going to break several other sysctls as well then. Many sysctls use sysctl_wire_old_buffer() explicitly so that they can then call SYSCTL_OUT() without dropping a lock. The pcblist sysctls do this for example I think. In general code in the kernel assumes that copyout(9) to/from a wired buffer is safe while holding mutexes or rwlocks. -- John Baldwin _______________________________________________ svn-src-head@freebsd.org mailing list http://lists.freebsd.org/mailman/listinfo/svn-src-head To unsubscribe, send any mail to "svn-src-head-unsubscr...@freebsd.org"
