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smp: Change function signatures to use call_single_data_t

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call_single_data_t is a size-aligned typedef of struct __call_single_data.

This alignment is desirable in order to have smp_call_function*() avoid
bouncing an extra cacheline in case of an unaligned csd, given this
would hurt performance.

Since the removal of struct request->csd in commit 660e802c76
("blk-mq: use percpu csd to remote complete instead of per-rq csd") there
are no current users of smp_call_function*() with unaligned csd.

Change every 'struct __call_single_data' function parameter to
'call_single_data_t', so we have warnings if any new code tries to
introduce an smp_call_function*() call with unaligned csd.

Signed-off-by: Leonardo Bras <leobras@redhat.com>
Reviewed-by: Guo Ren <guoren@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Link: https://lore.kernel.org/r/20230831063129.335425-1-leobras@redhat.com
This commit is contained in:
Leonardo Bras 2023-08-31 03:31:28 -03:00 • committed by Ingo Molnar
parent e0a99a839f
commit d090ec0df8
4 changed files with 19 additions and 19 deletions
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2
include/linux/smp.h
View file

@ -53,7 +53,7 @@ int smp_call_function_single(int cpuid, smp_call_func_t func, void *info,
void on_each_cpu_cond_mask(smp_cond_func_t cond_func, smp_call_func_t func,
void *info, bool wait, const struct cpumask *mask);
int smp_call_function_single_async(int cpu, struct __call_single_data *csd);
int smp_call_function_single_async(int cpu, call_single_data_t *csd);
/*
* Cpus stopping functions in panic. All have default weak definitions.

8
include/trace/events/csd.h
View file

@ -12,7 +12,7 @@ TRACE_EVENT(csd_queue_cpu,
TP_PROTO(const unsigned int cpu,
unsigned long callsite,
smp_call_func_t func,
struct __call_single_data *csd),
call_single_data_t *csd),
TP_ARGS(cpu, callsite, func, csd),
@ -39,7 +39,7 @@ TRACE_EVENT(csd_queue_cpu,
*/
DECLARE_EVENT_CLASS(csd_function,
TP_PROTO(smp_call_func_t func, struct __call_single_data *csd),
TP_PROTO(smp_call_func_t func, call_single_data_t *csd),
TP_ARGS(func, csd),
@ -57,12 +57,12 @@ DECLARE_EVENT_CLASS(csd_function,
);
DEFINE_EVENT(csd_function, csd_function_entry,
TP_PROTO(smp_call_func_t func, struct __call_single_data *csd),
TP_PROTO(smp_call_func_t func, call_single_data_t *csd),
TP_ARGS(func, csd)
);
DEFINE_EVENT(csd_function, csd_function_exit,
TP_PROTO(smp_call_func_t func, struct __call_single_data *csd),
TP_PROTO(smp_call_func_t func, call_single_data_t *csd),
TP_ARGS(func, csd)
);

26
kernel/smp.c
View file

@ -125,7 +125,7 @@ send_call_function_ipi_mask(struct cpumask *mask)
}
static __always_inline void
csd_do_func(smp_call_func_t func, void *info, struct __call_single_data *csd)
csd_do_func(smp_call_func_t func, void *info, call_single_data_t *csd)
{
trace_csd_function_entry(func, csd);
func(info);
@ -172,7 +172,7 @@ module_param(csd_lock_timeout, ulong, 0444);
static atomic_t csd_bug_count = ATOMIC_INIT(0);
/* Record current CSD work for current CPU, NULL to erase. */
static void __csd_lock_record(struct __call_single_data *csd)
static void __csd_lock_record(call_single_data_t *csd)
{
if (!csd) {
smp_mb(); /* NULL cur_csd after unlock. */
@ -187,13 +187,13 @@ static void __csd_lock_record(struct __call_single_data *csd)
/* Or before unlock, as the case may be. */
}
static __always_inline void csd_lock_record(struct __call_single_data *csd)
static __always_inline void csd_lock_record(call_single_data_t *csd)
{
if (static_branch_unlikely(&csdlock_debug_enabled))
__csd_lock_record(csd);
}
static int csd_lock_wait_getcpu(struct __call_single_data *csd)
static int csd_lock_wait_getcpu(call_single_data_t *csd)
{
unsigned int csd_type;
@ -208,7 +208,7 @@ static int csd_lock_wait_getcpu(struct __call_single_data *csd)
* the CSD_TYPE_SYNC/ASYNC types provide the destination CPU,
* so waiting on other types gets much less information.
*/
static bool csd_lock_wait_toolong(struct __call_single_data *csd, u64 ts0, u64 *ts1, int *bug_id)
static bool csd_lock_wait_toolong(call_single_data_t *csd, u64 ts0, u64 *ts1, int *bug_id)
{
int cpu = -1;
int cpux;
@ -272,7 +272,7 @@ static bool csd_lock_wait_toolong(struct __call_single_data *csd, u64 ts0, u64 *
* previous function call. For multi-cpu calls its even more interesting
* as we'll have to ensure no other cpu is observing our csd.
*/
static void __csd_lock_wait(struct __call_single_data *csd)
static void __csd_lock_wait(call_single_data_t *csd)
{
int bug_id = 0;
u64 ts0, ts1;
@ -286,7 +286,7 @@ static void __csd_lock_wait(struct __call_single_data *csd)
smp_acquire__after_ctrl_dep();
}
static __always_inline void csd_lock_wait(struct __call_single_data *csd)
static __always_inline void csd_lock_wait(call_single_data_t *csd)
{
if (static_branch_unlikely(&csdlock_debug_enabled)) {
__csd_lock_wait(csd);
@ -296,17 +296,17 @@ static __always_inline void csd_lock_wait(struct __call_single_data *csd)
smp_cond_load_acquire(&csd->node.u_flags, !(VAL & CSD_FLAG_LOCK));
}
#else
static void csd_lock_record(struct __call_single_data *csd)
static void csd_lock_record(call_single_data_t *csd)
{
}
static __always_inline void csd_lock_wait(struct __call_single_data *csd)
static __always_inline void csd_lock_wait(call_single_data_t *csd)
{
smp_cond_load_acquire(&csd->node.u_flags, !(VAL & CSD_FLAG_LOCK));
}
#endif
static __always_inline void csd_lock(struct __call_single_data *csd)
static __always_inline void csd_lock(call_single_data_t *csd)
{
csd_lock_wait(csd);
csd->node.u_flags |= CSD_FLAG_LOCK;
@ -319,7 +319,7 @@ static __always_inline void csd_lock(struct __call_single_data *csd)
smp_wmb();
}
static __always_inline void csd_unlock(struct __call_single_data *csd)
static __always_inline void csd_unlock(call_single_data_t *csd)
{
WARN_ON(!(csd->node.u_flags & CSD_FLAG_LOCK));
@ -372,7 +372,7 @@ void __smp_call_single_queue(int cpu, struct llist_node *node)
* for execution on the given CPU. data must already have
* ->func, ->info, and ->flags set.
*/
static int generic_exec_single(int cpu, struct __call_single_data *csd)
static int generic_exec_single(int cpu, call_single_data_t *csd)
{
if (cpu == smp_processor_id()) {
smp_call_func_t func = csd->func;
@ -658,7 +658,7 @@ EXPORT_SYMBOL(smp_call_function_single);
*
* Return: %0 on success or negative errno value on error
*/
int smp_call_function_single_async(int cpu, struct __call_single_data *csd)
int smp_call_function_single_async(int cpu, call_single_data_t *csd)
{
int err = 0;

2
kernel/up.c
View file

@ -25,7 +25,7 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
}
EXPORT_SYMBOL(smp_call_function_single);
int smp_call_function_single_async(int cpu, struct __call_single_data *csd)
int smp_call_function_single_async(int cpu, call_single_data_t *csd)
{
unsigned long flags;