Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1661387
| From | Noam Camus <noamca@mellanox.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 03/11] ARC: Allow irq threading |
| Date | 2017-06-08 17:30 +0200 |
| Message-ID | <tQ7xN-60p-35@gated-at.bofh.it> (permalink) |
| References | <tQ7xL-60p-3@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
From: Noam Camus <noamc@ezchip.com> Working with NPS400 we noticed that there is a possibility of L1 interrupt nesting that may run out kernel stack. The scenario include serving invoke_softirqs() from irq_exit() and once local_irq_enable() called can hit another one before we managed to restore last one and pop some place from kernel stack. Serving softirqs at dedicated kernel thread may mitigate this. We see that many architectures, including x86, behave like this. Note 1: All interrupts which must be non threaded should be marked IRQF_NO_THREAD. Note 2: using kernel param "threadirqs" is needed to actually turn this on. This configuration is only a preperation. Signed-off-by: Noam Camus <noamc@ezchip.com> --- arch/arc/Kconfig | 1 + 1 files changed, 1 insertions(+), 0 deletions(-) diff --git a/arch/arc/Kconfig b/arch/arc/Kconfig index 92c9128..dc1df6f 100644 --- a/arch/arc/Kconfig +++ b/arch/arc/Kconfig @@ -33,6 +33,7 @@ config ARC select HAVE_OPROFILE select HAVE_PERF_EVENTS select HANDLE_DOMAIN_IRQ + select IRQ_FORCED_THREADING select IRQ_DOMAIN select MODULES_USE_ELF_RELA select NO_BOOTMEM -- 1.7.1
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[PATCH 00/11] plat-eznps upstream cont. set 2 Noam Camus <noamca@mellanox.com> - 2017-06-08 17:30 +0200 [PATCH 05/11] ARC: Support more than one PGDIR for KVADDR Noam Camus <noamca@mellanox.com> - 2017-06-08 17:30 +0200 [PATCH 01/11] ARC: set level of log per CPU during boot to be debug level Noam Camus <noamca@mellanox.com> - 2017-06-08 17:30 +0200 [PATCH 02/11] ARC: send ipi to all cpus sharing task mm in case of page fault Noam Camus <noamca@mellanox.com> - 2017-06-08 17:30 +0200 [PATCH 11/11] ARC: [plat-eznps] avoid toggling of DPC register Noam Camus <noamca@mellanox.com> - 2017-06-08 17:30 +0200 [PATCH 04/11] ARC: Add CPU topology Noam Camus <noamca@mellanox.com> - 2017-06-08 17:30 +0200 [PATCH 03/11] ARC: Allow irq threading Noam Camus <noamca@mellanox.com> - 2017-06-08 17:30 +0200 [PATCH 10/11] ARC: [plat-eznps] handle dedicated AUX registers Noam Camus <noamca@mellanox.com> - 2017-06-08 17:30 +0200 [PATCH 06/11] ARC: [NUMA] added CONFIG_NUMA for plat-eznps Noam Camus <noamca@mellanox.com> - 2017-06-08 17:30 +0200
csiph-web