| commit | 77a8b8462b02a10aea5cad389a8f9260f79ede36 | |
| author | Paolo Bonzini <pbonzini@redhat.com> | |
| Fri, 16 Feb 2018 08:23:31 +0000 (16 09:23 +0100) | ||
| committer | Paolo Bonzini <pbonzini@redhat.com> | |
| Mon, 12 Mar 2018 15:12:47 +0000 (12 16:12 +0100) | ||
| tree | 5f337abf53ab50994a45f6a302f7da8ee341e01a | treesnapshot (tar.gz zip) |
| parent | 729c0ddd3cdf16973d850b1ee7c5234a1e4dddbb | commitdiff |
rcu: make memory barriers more explicit
Prepare for introducing smp_mb_placeholder() and smp_mb_global().
The new smp_mb() in synchronize_rcu() is not strictly necessary, since
the first atomic_mb_set for rcu_gp_ctr provides the required ordering.
However, synchronize_rcu is not performance critical, and it *will* be
necessary to introduce a smp_mb_global before calling wait_for_readers().
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Prepare for introducing smp_mb_placeholder() and smp_mb_global().
The new smp_mb() in synchronize_rcu() is not strictly necessary, since
the first atomic_mb_set for rcu_gp_ctr provides the required ordering.
However, synchronize_rcu is not performance critical, and it *will* be
necessary to introduce a smp_mb_global before calling wait_for_readers().
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| include/qemu/rcu.h | diffblobblamehistory | |
| util/rcu.c | diffblobblamehistory |