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Vendor kernel modules may implement irq balancers, which could take irq desc lock of an irq and then based on current affinity mask or affinity hint, reconfigure the affinity of that irq. For example : For an irq, for which affinity is broken i.e. all the cpus in its affinity mask have gone offline. For such irqs, we might want to reset the affinity, when the original set of affined cpus, come back online. desc->affinity_hint can be used for figuring out the original affinity. So, the sequence for doing this becomes: desc = irq_to_desc(i); raw_spin_lock(&desc->lock); affinity = desc->affinity_hint; raw_spin_unlock(&desc->lock); irq_set_affinity_hint(i, affinity); Here, we need to release the desc lock before calling the exported api irq_set_affinity_hint(). This creates a window where, after unlocking desc lock and before calling irq_set_affinity_hint(), where this setting can race with other irq_set_affinity_hint() callers. So, export irq_do_set_affinity() symbol to provide an api, which can be called with desc lock held. Bug: 187157600 Change-Id: Ifad88bfaa1e7eec09c3fe5a9dd7d1d421362b41e Signed-off-by: Neeraj Upadhyay <neeraju@codeaurora.org> |
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| .. | ||
| affinity.c | ||
| autoprobe.c | ||
| chip.c | ||
| cpuhotplug.c | ||
| debug.h | ||
| debugfs.c | ||
| devres.c | ||
| dummychip.c | ||
| generic-chip.c | ||
| handle.c | ||
| internals.h | ||
| ipi.c | ||
| irq_sim.c | ||
| irqdesc.c | ||
| irqdomain.c | ||
| Kconfig | ||
| Makefile | ||
| manage.c | ||
| matrix.c | ||
| migration.c | ||
| msi.c | ||
| pm.c | ||
| proc.c | ||
| resend.c | ||
| settings.h | ||
| spurious.c | ||
| timings.c | ||