On Sun, 28 Jul 2024 01:47:31 +0100, Sasha Levin <sashal@xxxxxxxxxx> wrote: > > From: James Morse <james.morse@xxxxxxx> > > [ Upstream commit fa2dabe57220e6af78ed7a2f7016bf250a618204 ] > > gic_acpi_match_gicc() is only called via gic_acpi_count_gicr_regions(). > It should only count the number of enabled redistributors, but it > also tries to sanity check the GICC entry, currently returning an > error if the Enabled bit is set, but the gicr_base_address is zero. > > Adding support for the online-capable bit to the sanity check will > complicate it, for no benefit. The existing check implicitly depends on > gic_acpi_count_gicr_regions() previous failing to find any GICR regions > (as it is valid to have gicr_base_address of zero if the redistributors > are described via a GICR entry). > > Instead of complicating the check, remove it. Failures that happen at > this point cause the irqchip not to register, meaning no irqs can be > requested. The kernel grinds to a panic() pretty quickly. > > Without the check, MADT tables that exhibit this problem are still > caught by gic_populate_rdist(), which helpfully also prints what went > wrong: > | CPU4: mpidr 100 has no re-distributor! > > Signed-off-by: James Morse <james.morse@xxxxxxx> > Reviewed-by: Gavin Shan <gshan@xxxxxxxxxx> > Tested-by: Miguel Luis <miguel.luis@xxxxxxxxxx> > Signed-off-by: Russell King (Oracle) <rmk+kernel@xxxxxxxxxxxxxxx> > Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > Signed-off-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx> > Reviewed-by: Marc Zyngier <maz@xxxxxxxxxx> > Link: https://lore.kernel.org/r/20240529133446.28446-14-Jonathan.Cameron@xxxxxxxxxx > Signed-off-by: Catalin Marinas <catalin.marinas@xxxxxxx> > Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> Please drop this. It has no purpose being backported to stable. Thanks, M. -- Without deviation from the norm, progress is not possible.
