| commit | a4d95680362b7eba0c4840b8d5598533900a2f17 | |
| author | Matthew Dillon <dillon@apollo.backplane.com> | |
| Tue, 3 Oct 2017 01:42:34 +0000 (2 18:42 -0700) | ||
| committer | Matthew Dillon <dillon@apollo.backplane.com> | |
| Tue, 3 Oct 2017 01:42:34 +0000 (2 18:42 -0700) | ||
| tree | c52e4e7eda73facad2f372608f914abb257ff530 | treesnapshot (tar.gz zip) |
| parent | bb36d905d2bf2569ce40fc3ebdab1877ae6342bf | commitdiff |
kernel - Fix GCC reordering problem with td_critcount
* Wrap all ++td->td_critcount and --td->td_critcount use cases
with an inline which executes cpu_ccfence() before and after,
to guarantee that GCC does not try to reorder the operation around
critical memory changes.
* This fixes a race in lockmgr() and possibly a few other places
too.
* Wrap all ++td->td_critcount and --td->td_critcount use cases
with an inline which executes cpu_ccfence() before and after,
to guarantee that GCC does not try to reorder the operation around
critical memory changes.
* This fixes a race in lockmgr() and possibly a few other places
too.