On Monday 14 May 2007, Tsutomu OWA wrote:
> --- linux-2.6.21-rt1/include/asm-powerpc/tlbflush.h 2007-04-26
> 12:08:32.000000000 +0900
> +++ rt/include/asm-powerpc/tlbflush.h 2007-05-14 16:12:47.000000000 +0900
> @@ -25,7 +25,12 @@ struct mm_struct;
> #include <linux/percpu.h>
> #include <asm/page.h>
>
> +#if defined(CONFIG_PPC_CELLEB) && defined(CONFIG_PREEMPT_RT)
> +/* Since tlb flush takes long time on Celleb, reduce it to 1 when Celleb &&
> RT */
> +#define PPC64_TLB_BATCH_NR 1
> +#else
> #define PPC64_TLB_BATCH_NR 192
> +#endif /* defined(CONFIG_PPC_CELLEB) && defined(CONFIG_PREEMPT_RT) */
With this code, you get silent side-effects of enabling PPC_CELLEB
along with another platform.
Maybe instead you should change the hpte_need_flush() to always flush
when running on the celleb platform and PREEMPT_RT is enabled.
Arnd <><
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