linux-toradex.git/arch/score/kernel, branch v3.6.8

score: Add missing RCU idle APIs on idle loop

2012-10-12T20:50:31+00:00

commit 0ee23fda59740767324b4340247ca41a2f498ca6 upstream.

In the old times, the whole idle task was considered
as an RCU quiescent state. But as RCU became more and
more successful overtime, some RCU read side critical
section have been added even in the code of some
architectures idle tasks, for tracing for example.

So nowadays, rcu_idle_enter() and rcu_idle_exit() must
be called by the architecture to tell RCU about the part
in the idle loop that doesn't make use of rcu read side
critical sections, typically the part that puts the CPU
in low power mode.

This is necessary for RCU to find the quiescent states in
idle in order to complete grace periods.

Add this missing pair of calls in scores's idle loop.

Reported-by: Paul E. McKenney 
Signed-off-by: Frederic Weisbecker 
Cc: Chen Liqin 
Cc: Lennox Wu 
Signed-off-by: Paul E. McKenney 
Reviewed-by: Josh Triplett 
Signed-off-by: Greg Kroah-Hartman

new helper: signal_delivered()

2012-06-01T16:58:52+00:00

Does block_sigmask() + tracehook_signal_handler();  called when
sigframe has been successfully built.  All architectures converted
to it; block_sigmask() itself is gone now (merged into this one).

I'm still not too happy with the signature, but that's a separate
story (IMO we need a structure that would contain signal number +
siginfo + k_sigaction, so that get_signal_to_deliver() would fill one,
signal_delivered(), handle_signal() and probably setup...frame() -
take one).

Signed-off-by: Al Viro

most of set_current_blocked() callers want SIGKILL/SIGSTOP removed from set

2012-06-01T16:58:51+00:00

Only 3 out of 63 do not.  Renamed the current variant to __set_current_blocked(),
added set_current_blocked() that will exclude unblockable signals, switched
open-coded instances to it.

Signed-off-by: Al Viro

pull clearing RESTORE_SIGMASK into block_sigmask()

2012-06-01T16:58:49+00:00

Signed-off-by: Al Viro

new helper: sigmask_to_save()

2012-06-01T16:58:48+00:00

replace boilerplate "should we use ->saved_sigmask or ->blocked?"
with calls of obvious inlined helper...

Signed-off-by: Al Viro

new helper: restore_saved_sigmask()

2012-06-01T16:58:47+00:00

first fruits of ..._restore_sigmask() helpers: now we can take
boilerplate "signal didn't have a handler, clear RESTORE_SIGMASK
and restore the blocked mask from ->saved_mask" into a common
helper.  Open-coded instances switched...

Signed-off-by: Al Viro

move key_repace_session_keyring() into tracehook_notify_resume()

2012-05-24T02:09:20+00:00

Signed-off-by: Al Viro

score: add handling of NOTIFY_RESUME to do_notify_resume()

2012-05-22T03:59:47+00:00

It's already called if TIF_NOTIFY_RESUME is set, so we only
need to add the actual work.  Note that checking for RESTORE_SIGMASK
was not needed - set_restore_sigmask() also sets SIGPENDING, so
we never RESTORE_SIGMASK without SIGPENDING.

Signed-off-by: Al Viro

score: don't open-code force_sigsegv()

2012-05-22T03:59:19+00:00

Signed-off-by: Al Viro

score: ->restart_block.fn needs to be reset on rt_sigreturn

2012-05-22T03:52:39+00:00

Signed-off-by: Al Viro