diff options
| author | Valentin Schneider | 2020-07-30 18:03:21 +0100 |
|---|---|---|
| committer | Marc Zyngier | 2020-09-06 18:26:13 +0100 |
| commit | 1b57d91b969cda1d2c3530f2e829ca366a9c7df7 (patch) | |
| tree | 52a46c1f82675a333d6e771e8e194e6947b9625f /kernel/irq | |
| parent | 5f774f5e12512b850a611aa99b4601d7eac50edb (diff) | |
irqchip/gic-v2, v3: Prevent SW resends entirely
The GIC irqchips can now use a HW resend when a retrigger is invoked by
check_irq_resend(). However, should the HW resend fail, check_irq_resend()
will still attempt to trigger a SW resend, which is still a bad idea for
the GICs.
Prevent this from happening by setting IRQD_HANDLE_ENFORCE_IRQCTX on all
GIC IRQs. Technically per-cpu IRQs do not need this, as their flow handlers
never set IRQS_PENDING, but this aligns all IRQs wrt context enforcement:
this also forces all GIC IRQ handling to happen in IRQ context (as defined
by in_irq()).
Signed-off-by: Valentin Schneider <valentin.schneider@arm.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20200730170321.31228-3-valentin.schneider@arm.com
Diffstat (limited to 'kernel/irq')
0 files changed, 0 insertions, 0 deletions