[PATCH V2 0/1] irqchip: GIC: check and clear GIC interupt active state
sdu.liu at huawei.com
Sun Aug 3 21:17:39 PDT 2014
For this version of GIC codes, kernel assumes that all the interrupt
status of GIC is inactive. So the kernel does not check this when
This is no problem on must sitations. But when kdump is deplayed.
And a panic occurs when an interrupt is being handled (may be PPI
). We have no chance to write relative bit to GICC_EOIR. So this
interrupt remains active. And GIC will not deliver this type
interrupt to cpu interface. And the capture kernel may fail to boot
becase of lacking of certain interrupt (such as timer interupt).
I have test this patch on arma9el(GIC v1), arma15el and arma15eb(GIC v2)
platforms. And the tests passed.
changes from V1:
- used for_each_set_bit instead of find_next_bit
- removed the GIC version indentifying codes.
- used one way to inactive GIC interupt states for all GIC version
Liu Hua (1):
GIC: introduce method to deactive interupts
drivers/irqchip/irq-gic.c | 26 ++++++++++++++++++++++++++
1 file changed, 26 insertions(+)
More information about the linux-arm-kernel