linux-kernel - [PATCH 0/2] [RFC] RT: Optionally allow IRQF

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-ID: <20071005153517.24349.62653.stgit@ghaskins-t60p.haskins.net>
Date:	Fri, 05 Oct 2007 11:42:04 -0400
From:	Gregory Haskins <ghaskins@...ell.com>
To:	mingo@...e.hu, tglx@...utronix.de, rostedt@...dmis.org
Cc:	linux-rt-users@...r.kernel.org, linux-kernel@...r.kernel.org,
	ghaskins@...ell.com
Subject: [PATCH 0/2] [RFC] RT: Optionally allow IRQF_NODELAY on serial console

This series may help debugging certain circumstances where the serial
console is unreponsive (e.g. RT51+ spinner, or scheduler problem).  It changes
the serial8250 driver to use IRQF_NODELAY so that interrupts execute in irq
context instead of a kthread.

It works pretty well on this end, though it is admitted not fully baked.  For
instance, a few paths in sysrq can still call into non-raw spinlocks
(sched_debug_show, for instance) which will cause subsequent errors.  Also,
if you use KDB, be sure to convert the kdb_printf_lock to raw as well.  I may
send a KDB related patch seperately.

I am sending this out now in case it is helpful to someone.

Regards,
-Greg   
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/