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powerpc/e500: Save SPEFCSR in flush_spe_to_thread()

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giveup_spe() saves the SPE state which is protected by MSR[SPE].
However, modifying SPEFSCR does not trap when MSR[SPE]=0.
And since SPEFSCR is already saved/restored in _switch(),
not all the callers want to save SPEFSCR again.
Thus, saving SPEFSCR should not belong to giveup_spe().

This patch moves SPEFSCR saving to flush_spe_to_thread(),
and cleans up the caller that needs to save SPEFSCR accordingly.

Signed-off-by: Liu Yu <yu.liu@freescale.com>
Acked-by: Kumar Gala <galak@kernel.crashing.org>
Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
yu liu
2011-06-14 18:34:25 -05:00
committed by Avi Kivity
parent a22a2daccf
commit 685659ee70
3 changed files with 2 additions and 6 deletions
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5
arch/powerpc/kernel/traps.c
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@@ -1387,10 +1387,7 @@ void SPEFloatingPointException(struct pt_regs *regs)
int code = 0;
int err;
preempt_disable();
if (regs->msr & MSR_SPE)
giveup_spe(current);
preempt_enable();
flush_spe_to_thread(current);
spefscr = current->thread.spefscr;
fpexc_mode = current->thread.fpexc_mode;