On Saturday 31 October 2015 06:52 PM, Noam Camus wrote: > From: Tal Zilcer <t...@ezchip.com> > > Since the CTOP is SMT hardware multi-threaded, we need to hint > the HW that now will be a very good time to do a hardware > thread context switching. This is done by issuing the schd.rw > instruction (binary coded here so as to not require specific > revision of GCC to build the kernel). > sched.rw means that Thread becomes eligible for execution by > the threads scheduler after all pending read/write > transactions were completed. > > Signed-off-by: Noam Camus <no...@ezchip.com> > Cc: Peter Zijlstra <pet...@infradead.org>
Acked-by: Vineet Gupta <vgu...@synopsys.com> > --- > arch/arc/include/asm/processor.h | 5 +++++ > 1 files changed, 5 insertions(+), 0 deletions(-) > > diff --git a/arch/arc/include/asm/processor.h > b/arch/arc/include/asm/processor.h > index 7266ede..f1a51a6 100644 > --- a/arch/arc/include/asm/processor.h > +++ b/arch/arc/include/asm/processor.h > @@ -58,7 +58,12 @@ struct task_struct; > * get optimised away by gcc > */ > #ifdef CONFIG_SMP > +#ifdef CONFIG_EZNPS_MTM_EXT > +#define cpu_relax() \ > + __asm__ __volatile__ (".word %0" : : "i"(CTOP_INST_SCHD_RW) : "memory") > +#else > #define cpu_relax() __asm__ __volatile__ ("" : : : "memory") > +#endif > #else > #define cpu_relax() do { } while (0) > #endif -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/