Module Name: src Committed By: riz Date: Tue Jan 26 04:50:22 UTC 2016
Modified Files: src/sys/kern [netbsd-7]: kern_softint.c Log Message: Pull up following revision(s) (requested by knakahara in ticket #1067): sys/kern/kern_softint.c: revision 1.42 fix the following softint parallel operation problem. (0) softint handler "handler A" is established (1) CPU#X does softint_schedule() for "handler A" - the softhand_t is set SOFTINT_PENDING flag - the softhand_t is NOT set SOFTINT_ACTIVE flag yet (2) CPU#X begins other H/W interrupt processing (3) CPU#Y does softint_disestablish() for "handler A" - waits until softhand_t's SOFTINT_ACTIVE of all CPUs is clear - the softhand_t is set not SOFTINT_ACTIVE but SOFTINT_PENDING, so CPU#Y does not wait - unset the function of "handler A" (4) CPU#X does softint_execute() - the function of "handler A" is already clear, so panic To generate a diff of this commit: cvs rdiff -u -r1.41 -r1.41.2.1 src/sys/kern/kern_softint.c Please note that diffs are not public domain; they are subject to the copyright notices on the relevant files.