From: Ed Swierk <eswierk@aristanetworks.com>
Date: Mon, 26 Jan 2009 23:33:31 +0000 (-0800)
Subject: signals, debug: fix BUG: using smp_processor_id() in preemptible code in print_fatal_... 
X-Git-Tag: v2.6.29-rc4~78^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3a9f84d354ce1e19956083c8e691727dea33bd5a;p=pandora-kernel.git

signals, debug: fix BUG: using smp_processor_id() in preemptible code in print_fatal_signal()

With print-fatal-signals=1 on a kernel with CONFIG_PREEMPT=y, sending an
unexpected signal to a process causes a BUG: using smp_processor_id() in
preemptible code.

get_signal_to_deliver() releases the siglock before calling
print_fatal_signal(), which calls show_regs(), which calls
smp_processor_id(), which is not supposed to be called from a
preemptible thread.

Make sure show_regs() runs with preemption disabled.

Signed-off-by: Ed Swierk <eswierk@aristanetworks.com>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
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