linux-kernel - preempt_disable and softirq

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Message-ID: <CA+yNG29pbNxiES1kR=sKr3Sn3g8rgz5p17dZq7MBHz1F9hnkCA@mail.gmail.com>
Date:	Sat, 6 Aug 2011 19:03:53 -0700
From:	Venkat Subbiah <v.subbiah@...il.com>
To:	linux-kernel@...r.kernel.org
Subject: preempt_disable and softirq

Does disabling preemption by calling preempt_disable() cause softirqs
on the local cpu to be disabled too?

I believe drivers napi polling functions is being called when the
current cpu is holding on to a read lock of tasklist_lock. read_lock()
itself disables preemption.

An easy way to check in the napi polling functions that the current
cpu is not holding on to tasklist_lock? Of course this is mute if
softirqs itself cannot execute when premption is disabled.

PS: I am not subscribed to the groups. Please CC me on your answer.

Thanks,
Venkat
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