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| author | Ilya Leoshkevich <iii@linux.ibm.com> | 2021-02-19 23:32:56 +0100 |
|---|---|---|
| committer | Vasily Gorbik <gor@linux.ibm.com> | 2021-02-24 00:31:22 +0100 |
| commit | 55f03123f60985815e57cc9d1b29dea48e32e709 (patch) | |
| tree | 9b630a367a297fef57d6f3a7a5f54872fa7f5362 /arch/s390/kernel | |
| parent | s390/topology: move cpumasks away from stack (diff) | |
| download | linux-55f03123f60985815e57cc9d1b29dea48e32e709.tar.xz linux-55f03123f60985815e57cc9d1b29dea48e32e709.zip | |
s390/smp: implement arch_irq_work_raise()
The immediate need to have this is to have bpf_send_signal() send the
signal ASAP instead of during the next hrtimer interrupt. However, it
should also improve irq_work_queue() latencies in general, as well as
get s390 out of the lame architectures list [1].
[1] https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/tree/kernel/irq_work.c?h=v5.11#n45
Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Vasily Gorbik <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390/kernel')
| -rw-r--r-- | arch/s390/kernel/smp.c | 11 |
1 files changed, 11 insertions, 0 deletions
diff --git a/arch/s390/kernel/smp.c b/arch/s390/kernel/smp.c index 7f30d954519b..58c8afa3da65 100644 --- a/arch/s390/kernel/smp.c +++ b/arch/s390/kernel/smp.c @@ -30,6 +30,7 @@ #include <linux/delay.h> #include <linux/interrupt.h> #include <linux/irqflags.h> +#include <linux/irq_work.h> #include <linux/cpu.h> #include <linux/slab.h> #include <linux/sched/hotplug.h> @@ -62,6 +63,7 @@ enum { ec_call_function_single, ec_stop_cpu, ec_mcck_pending, + ec_irq_work, }; enum { @@ -508,6 +510,8 @@ static void smp_handle_ext_call(void) generic_smp_call_function_single_interrupt(); if (test_bit(ec_mcck_pending, &bits)) __s390_handle_mcck(); + if (test_bit(ec_irq_work, &bits)) + irq_work_run(); } static void do_ext_call_interrupt(struct ext_code ext_code, @@ -540,6 +544,13 @@ void smp_send_reschedule(int cpu) pcpu_ec_call(pcpu_devices + cpu, ec_schedule); } +#ifdef CONFIG_IRQ_WORK +void arch_irq_work_raise(void) +{ + pcpu_ec_call(pcpu_devices + smp_processor_id(), ec_irq_work); +} +#endif + /* * parameter area for the set/clear control bit callbacks */ |