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rcu: Delete unused rcu_gp_might_be_stalled() function

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The rcu_gp_might_be_stalled() function is no longer used, so this commit
removes it.

Signed-off-by: Paul E. McKenney <paulmck@kernel.org>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Frederic Weisbecker <frederic@kernel.org>
This commit is contained in:
Paul E. McKenney 2024-10-16 09:19:29 -07:00 committed by Frederic Weisbecker
parent f7345ccc62
commit 26ff1fb029
3 changed files with 0 additions and 32 deletions
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1
include/linux/rcutiny.h
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@ -165,7 +165,6 @@ static inline bool rcu_inkernel_boot_has_ended(void) { return true; }
static inline bool rcu_is_watching(void) { return true; } static inline bool rcu_is_watching(void) { return true; }
static inline void rcu_momentary_eqs(void) { } static inline void rcu_momentary_eqs(void) { }
static inline void kfree_rcu_scheduler_running(void) { } static inline void kfree_rcu_scheduler_running(void) { }
static inline bool rcu_gp_might_be_stalled(void) { return false; }
/* Avoid RCU read-side critical sections leaking across. */ /* Avoid RCU read-side critical sections leaking across. */
static inline void rcu_all_qs(void) { barrier(); } static inline void rcu_all_qs(void) { barrier(); }

1
include/linux/rcutree.h
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@ -40,7 +40,6 @@ void kvfree_rcu_barrier(void);
void rcu_barrier(void); void rcu_barrier(void);
void rcu_momentary_eqs(void); void rcu_momentary_eqs(void);
void kfree_rcu_scheduler_running(void); void kfree_rcu_scheduler_running(void);
bool rcu_gp_might_be_stalled(void);
struct rcu_gp_oldstate { struct rcu_gp_oldstate {
unsigned long rgos_norm; unsigned long rgos_norm;

30
kernel/rcu/tree_stall.h
View File

@ -76,36 +76,6 @@ int rcu_jiffies_till_stall_check(void)
} }
EXPORT_SYMBOL_GPL(rcu_jiffies_till_stall_check); EXPORT_SYMBOL_GPL(rcu_jiffies_till_stall_check);
/**
* rcu_gp_might_be_stalled - Is it likely that the grace period is stalled?
*
* Returns @true if the current grace period is sufficiently old that
* it is reasonable to assume that it might be stalled. This can be
* useful when deciding whether to allocate memory to enable RCU-mediated
* freeing on the one hand or just invoking synchronize_rcu() on the other.
* The latter is preferable when the grace period is stalled.
*
* Note that sampling of the .gp_start and .gp_seq fields must be done
* carefully to avoid false positives at the beginnings and ends of
* grace periods.
*/
bool rcu_gp_might_be_stalled(void)
{
unsigned long d = rcu_jiffies_till_stall_check() / RCU_STALL_MIGHT_DIV;
unsigned long j = jiffies;
if (d < RCU_STALL_MIGHT_MIN)
d = RCU_STALL_MIGHT_MIN;
smp_mb(); // jiffies before .gp_seq to avoid false positives.
if (!rcu_gp_in_progress())
return false;
// Long delays at this point avoids false positive, but a delay
// of ULONG_MAX/4 jiffies voids your no-false-positive warranty.
smp_mb(); // .gp_seq before second .gp_start
// And ditto here.
return !time_before(j, READ_ONCE(rcu_state.gp_start) + d);
}
/* Don't do RCU CPU stall warnings during long sysrq printouts. */ /* Don't do RCU CPU stall warnings during long sysrq printouts. */
void rcu_sysrq_start(void) void rcu_sysrq_start(void)
{ {