From: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Date: Mon, 16 Apr 2007 14:19:44 +0000 (+0900)
Subject: [MIPS] Retry {save,restore}_fp_context if failed in atomic context.
X-Git-Tag: v2.6.21~37^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=faea62346444ce5b1dba8fb5291d95b676522c42;p=pandora-kernel.git

[MIPS] Retry {save,restore}_fp_context if failed in atomic context.

The save_fp_context()/restore_fp_context() might sleep on accessing
user stack and therefore might lose FPU ownership in middle of them.

If these function failed due to "in_atomic" test in do_page_fault,
touch the sigcontext area in non-atomic context and retry these
save/restore operation.

This is a replacement of a (broken) fix which was titled "Allow CpU
exception in kernel partially".

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
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