From mboxrd@z Thu Jan  1 00:00:00 1970
From: Bart Van Assche <bvanassche-HInyCGIudOg@public.gmane.org>
Subject: Re: MLX4 Cq Question
Date: Tue, 21 May 2013 12:42:09 +0200
Message-ID: <519B4F81.9040108@acm.org>
References: <51968438.7070907@opengridcomputing.com> <CAG4TOxNi0PxxskqXgxRhMPG0bmr+sS-x0_RG-zKyvLW1LNzoBg@mail.gmail.com> <201305201753.10806.jackm@dev.mellanox.co.il> <519B4104.4090102@mellanox.com>
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To: Or Gerlitz <ogerlitz-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>
Cc: Jack Morgenstein <jackm-LDSdmyG8hGV8YrgS2mwiifqBs+8SCbDb@public.gmane.org>, Eli Cohen <eli-VPRAkNaXOzVWk0Htik3J/w@public.gmane.org>, Roland Dreier <roland-DgEjT+Ai2ygdnm+yROfE0A@public.gmane.org>, Tom Tucker <tom-7bPotxP6k4+P2YhJcF5u+vpXobYPEAuW@public.gmane.org>, "linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org" <linux-rdma-u79uwXL29TY76Z2rM5mHXA@public.gmane.org>
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On 05/21/13 11:40, Or Gerlitz wrote:
> 2. is possible in the Linux kernel for one hard irq callback to flash on
> CPU X while another hard irq callback is running on the same CPU?

I think that from kernel 2.6.35 on MSI IRQs are no longer nested. See 
also 
http://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/?id=753649dbc49345a73a2454c770a3f2d54d11aec6 
or http://lwn.net/Articles/380931/.

Bart.
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