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* sh: Fix occasional FPU register corruption under preempt.Paul Mundt2008-03-261-0/+1
| | | | | | | | | | | Presently with preempt enabled there's the possibility to be preempted after the TIF_USEDFPU test and the register save, leading to bogus state post-__switch_to(). Use an explicit preempt_disable()/enable() pair around unlazy_fpu()/clear_fpu() to avoid this. Follows the x86 change. Reported-by: Takuo Koguchi <takuo.koguchi.sw@hitachi.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: GUSA atomic rollback support.Stuart Menefy2008-01-281-18/+0
| | | | | | | | | | This implements kernel-level atomic rollback built on top of gUSA, as an alternative non-IRQ based atomicity method. This is generally a faster method for platforms that are lacking the LL/SC pairs that SH-4A and later use, and is only supportable on legacy cores. Signed-off-by: Stuart Menefy <stuart.menefy@st.com> Signed-off-by: Paul Mundt <lethal@linux-sh.org>
* sh: Move in the SH-5 signal trampoline impl.Paul Mundt2008-01-281-0/+629
Signed-off-by: Paul Mundt <lethal@linux-sh.org>