From: Baruch Siach <baruch@tkos.co.il>
Date: Mon, 14 Oct 2013 22:22:43 +0000 (+0400)
Subject: xtensa: don't use alternate signal stack on threads
X-Git-Tag: v3.2.53~19
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=06512214e58849e661a67cdc215ca7af26afa58a;p=pandora-kernel.git

xtensa: don't use alternate signal stack on threads

commit cba9a90053e3b7973eff4f1946f33032e98eeed5 upstream.

According to create_thread(3): "The new thread does not inherit the creating
thread's alternate signal stack". Since commit f9a3879a (Fix sigaltstack
corruption among cloned threads), current->sas_ss_size is set to 0 for cloned
processes sharing VM with their parent. Don't use the (nonexistent) alternate
signal stack in this case. This has been broken since commit 29c4dfd9 ([XTENSA]
Remove non-rt signal handling).

Fixes the SA_ONSTACK part of the nptl/tst-cancel20 test from uClibc.

Signed-off-by: Baruch Siach <baruch@tkos.co.il>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
Signed-off-by: Chris Zankel <chris@zankel.net>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
---

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