GitHub-Mirror/Star64_linux
2
0
Fork 0
mirror of https://github.com/Fishwaldo/Star64_linux.git synced 2025-06-28 01:21:58 +00:00
Code Issues Projects Releases Packages Wiki Activity Actions

tools/memory-model: Add SRCU support

Browse source 
Add support for SRCU.  Herd creates srcu events and linux-kernel.def
associates them with three possible annotations (srcu-lock,
srcu-unlock, and sync-srcu) corresponding to the API routines
srcu_read_lock(), srcu_read_unlock(), and synchronize_srcu().

The linux-kernel.bell file now declares the annotations
and determines matching lock/unlock pairs delimiting SRCU read-side
critical sections, and it also checks for synchronize_srcu() calls
inside an RCU critical section (which would generate a "sleeping in
atomic context" error in real kernel code).  The linux-kernel.cat file
now adds SRCU-induced ordering, analogous to the existing RCU-induced
ordering, to the gp and rcu-fence relations.

Curiously enough, these small changes to the model's .cat code are all
that is needed to describe SRCU.

Portions of this patch (linux-kernel.def and the first hunk in
linux-kernel.bell) were written by Luc Maranget.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
CC: Luc Maranget <luc.maranget@inria.fr>
Signed-off-by: Paul E. McKenney <paulmck@linux.ibm.com>
Tested-by: Andrea Parri <andrea.parri@amarulasolutions.com>
This commit is contained in:
Alan Stern 2018-11-15 11:20:37 -05:00 • committed by Paul E. McKenney
parent 284749b0ae
commit a3f600d92d
3 changed files with 44 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

5
tools/memory-model/linux-kernel.def
View file

@ -47,6 +47,11 @@ rcu_read_unlock() { __fence{rcu-unlock}; }
synchronize_rcu() { __fence{sync-rcu}; }
synchronize_rcu_expedited() { __fence{sync-rcu}; }
// SRCU
srcu_read_lock(X) __srcu{srcu-lock}(X)
srcu_read_unlock(X,Y) { __srcu{srcu-unlock}(X); }
synchronize_srcu(X) { __srcu{sync-srcu}(X); }
// Atomic
atomic_read(X) READ_ONCE(*X)
atomic_set(X,V) { WRITE_ONCE(*X,V); }