tree d00e53763ca9b145348e5754aaf0cd4dcbb12123
parent 5323180db75d562a287cb2020b07c9422df13df6
author Atsushi Nemoto <anemo@mba.ocn.ne.jp> 1176733184 +0900
committer Ralf Baechle <ralf@linux-mips.org> 1177077517 +0100

[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>