[PATCH v5 0/14] KGDB/KDB FIQ (NMI) debugger · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 01/14] serial/amba-pl011: fix ages old copy-paste errors · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 02/14] drivers/tty/serial/amba-pl0{10,11}.c: use clk_prepare_enable and clk_disable_unprepare · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 03/14] kernel/debug: Mask KGDB NMI upon entry · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 04/14] kdb: Implement disable_nmi command · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 05/14] kdb: Turn KGDB_KDB=n stubs into static inlines · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 06/14] tty/serial/core: Introduce poll_init callback · Anton Vorontsov <hidden> · 2012-09-10
Re: [PATCH 06/14] tty/serial/core: Introduce poll_init callback · Alan Cox <hidden> · 2012-09-10
Re: [PATCH 06/14] tty/serial/core: Introduce poll_init callback · Anton Vorontsov <hidden> · 2012-09-10
Re: [PATCH 06/14] tty/serial/core: Introduce poll_init callback · Alan Cox <hidden> · 2012-09-10
[PATCH 07/14] tty/serial/amba-pl011: Implement poll_init callback · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 08/14] tty/serial/kgdboc: Add and wire up clear_irqs callback · Anton Vorontsov <hidden> · 2012-09-10
Re: [PATCH 08/14] tty/serial/kgdboc: Add and wire up clear_irqs callback · Alan Cox <hidden> · 2012-09-10
Re: [PATCH 08/14] tty/serial/kgdboc: Add and wire up clear_irqs callback · Anton Vorontsov <hidden> · 2012-09-10
Re: [PATCH 08/14] tty/serial/kgdboc: Add and wire up clear_irqs callback · Alan Cox <hidden> · 2012-09-10
Re: [PATCH 08/14] tty/serial/kgdboc: Add and wire up clear_irqs callback · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 09/14] tty/serial/amba-pl011: Implement clear_irqs callback · Anton Vorontsov <hidden> · 2012-09-10
Re: [PATCH 09/14] tty/serial/amba-pl011: Implement clear_irqs callback · Alan Cox <hidden> · 2012-09-10
Re: [PATCH 09/14] tty/serial/amba-pl011: Implement clear_irqs callback · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 10/14] tty/serial: Add kgdb_nmi driver · Anton Vorontsov <hidden> · 2012-09-10
Re: [PATCH 10/14] tty/serial: Add kgdb_nmi driver · Alan Cox <hidden> · 2012-09-10
Re: [PATCH 10/14] tty/serial: Add kgdb_nmi driver · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 11/14] ARM: Move some macros from entry-armv to entry-header · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 12/14] ARM: Add KGDB/KDB FIQ debugger generic code · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 13/14] ARM: VIC: Add a couple of low-level FIQ management helpers · Anton Vorontsov <hidden> · 2012-09-10
[PATCH 14/14] ARM: versatile: Make able to use UART ports for KGDB FIQ debugger · Anton Vorontsov <hidden> · 2012-09-10

Re: [PATCH 08/14] tty/serial/kgdboc: Add and wire up clear_irqs callback

From: Alan Cox <hidden>
Date: 2012-09-10 11:12:24
Also in: linux-arm-kernel, lkml

serial port, the CPU receives NMI exception, and we fall into KDB shell.
So, it is our "debug console", and it is able to interrupt (and thus
debug) even IRQ handlers themselves.


You seem to have an assumption of single core here. What happens if the
NMI hits CPU #0 and the serial IRQ hits CPU #1 simultaneously ?

Alan

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