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rcu: rename PREEMPT_AUTO to PREEMPT_LAZY

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Replace mentions of PREEMPT_AUTO with PREEMPT_LAZY.

Also, since PREMPT_LAZY implies PREEMPTION, we can reduce the
TASKS_RCU selection criteria from this:

  NEED_TASKS_RCU && (PREEMPTION || PREEMPT_AUTO)

to this:

  NEED_TASKS_RCU && PREEMPTION

CC: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Frederic Weisbecker <frederic@kernel.org>
Reviewed-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Signed-off-by: Ankur Arora <ankur.a.arora@oracle.com>
Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Signed-off-by: Boqun Feng <boqun.feng@gmail.com>
This commit is contained in:
Ankur Arora 2024-12-12 20:06:53 -08:00 committed by Boqun Feng
parent ad6b5b73ff
commit 4dca1af414
3 changed files with 9 additions and 9 deletions
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2
include/linux/srcutiny.h
View File

@ -64,7 +64,7 @@ static inline int __srcu_read_lock(struct srcu_struct *ssp)
{
int idx;
preempt_disable(); // Needed for PREEMPT_AUTO
preempt_disable(); // Needed for PREEMPT_LAZY
idx = ((READ_ONCE(ssp->srcu_idx) + 1) & 0x2) >> 1;
WRITE_ONCE(ssp->srcu_lock_nesting[idx], READ_ONCE(ssp->srcu_lock_nesting[idx]) + 1);
preempt_enable();

2
kernel/rcu/Kconfig
View File

@ -91,7 +91,7 @@ config NEED_TASKS_RCU
config TASKS_RCU
bool
default NEED_TASKS_RCU && (PREEMPTION || PREEMPT_AUTO)
default NEED_TASKS_RCU && PREEMPTION
select IRQ_WORK
config FORCE_TASKS_RUDE_RCU

14
kernel/rcu/srcutiny.c
View File

@ -98,7 +98,7 @@ void __srcu_read_unlock(struct srcu_struct *ssp, int idx)
{
int newval;
preempt_disable(); // Needed for PREEMPT_AUTO
preempt_disable(); // Needed for PREEMPT_LAZY
newval = READ_ONCE(ssp->srcu_lock_nesting[idx]) - 1;
WRITE_ONCE(ssp->srcu_lock_nesting[idx], newval);
preempt_enable();
@ -120,7 +120,7 @@ void srcu_drive_gp(struct work_struct *wp)
struct srcu_struct *ssp;
ssp = container_of(wp, struct srcu_struct, srcu_work);
preempt_disable(); // Needed for PREEMPT_AUTO
preempt_disable(); // Needed for PREEMPT_LAZY
if (ssp->srcu_gp_running || ULONG_CMP_GE(ssp->srcu_idx, READ_ONCE(ssp->srcu_idx_max))) {
preempt_enable();
return; /* Already running or nothing to do. */
@ -138,7 +138,7 @@ void srcu_drive_gp(struct work_struct *wp)
WRITE_ONCE(ssp->srcu_gp_waiting, true); /* srcu_read_unlock() wakes! */
preempt_enable();
swait_event_exclusive(ssp->srcu_wq, !READ_ONCE(ssp->srcu_lock_nesting[idx]));
preempt_disable(); // Needed for PREEMPT_AUTO
preempt_disable(); // Needed for PREEMPT_LAZY
WRITE_ONCE(ssp->srcu_gp_waiting, false); /* srcu_read_unlock() cheap. */
WRITE_ONCE(ssp->srcu_idx, ssp->srcu_idx + 1);
preempt_enable();
@ -159,7 +159,7 @@ void srcu_drive_gp(struct work_struct *wp)
* at interrupt level, but the ->srcu_gp_running checks will
* straighten that out.
*/
preempt_disable(); // Needed for PREEMPT_AUTO
preempt_disable(); // Needed for PREEMPT_LAZY
WRITE_ONCE(ssp->srcu_gp_running, false);
idx = ULONG_CMP_LT(ssp->srcu_idx, READ_ONCE(ssp->srcu_idx_max));
preempt_enable();
@ -172,7 +172,7 @@ static void srcu_gp_start_if_needed(struct srcu_struct *ssp)
{
unsigned long cookie;
preempt_disable(); // Needed for PREEMPT_AUTO
preempt_disable(); // Needed for PREEMPT_LAZY
cookie = get_state_synchronize_srcu(ssp);
if (ULONG_CMP_GE(READ_ONCE(ssp->srcu_idx_max), cookie)) {
preempt_enable();
@ -199,7 +199,7 @@ void call_srcu(struct srcu_struct *ssp, struct rcu_head *rhp,
rhp->func = func;
rhp->next = NULL;
preempt_disable(); // Needed for PREEMPT_AUTO
preempt_disable(); // Needed for PREEMPT_LAZY
local_irq_save(flags);
*ssp->srcu_cb_tail = rhp;
ssp->srcu_cb_tail = &rhp->next;
@ -261,7 +261,7 @@ unsigned long start_poll_synchronize_srcu(struct srcu_struct *ssp)
{
unsigned long ret;
preempt_disable(); // Needed for PREEMPT_AUTO
preempt_disable(); // Needed for PREEMPT_LAZY
ret = get_state_synchronize_srcu(ssp);
srcu_gp_start_if_needed(ssp);
preempt_enable();