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3 Commits

Author SHA1 Message Date
Paul Mundt 9bbafce2ee sh: Fix occasional FPU register corruption under preempt. 
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>
 2008-03-26 19:02:47 +09:00
Stuart Menefy 1efe4ce3ca sh: GUSA atomic rollback support. 
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>
 2008-01-28 13:18:58 +09:00
Paul Mundt f7a7b15344 sh: Move in the SH-5 signal trampoline impl. 
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
 2008-01-28 13:18:43 +09:00