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SubjectRe: [PATCH 5/9] powerpc/85xx: disable irq by hardware when suspend for 64-bit
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On Fri, 2014-03-07 at 12:58 +0800, Chenhui Zhao wrote:
> In 64-bit mode, kernel just clears the irq soft-enable flag
> in struct paca_struct to disable external irqs. But, in
> the case of suspend, irqs should be disabled by hardware.
> Therefore, hook a function to ppc_md.suspend_disable_irqs
> to really disable irqs.
>
> Signed-off-by: Chenhui Zhao <chenhui.zhao@freescale.com>
> ---
> arch/powerpc/platforms/85xx/corenet_generic.c | 12 ++++++++++++
> 1 files changed, 12 insertions(+), 0 deletions(-)
>
> diff --git a/arch/powerpc/platforms/85xx/corenet_generic.c b/arch/powerpc/platforms/85xx/corenet_generic.c
> index 3fdf9f3..983d81f 100644
> --- a/arch/powerpc/platforms/85xx/corenet_generic.c
> +++ b/arch/powerpc/platforms/85xx/corenet_generic.c
> @@ -32,6 +32,13 @@
> #include <sysdev/fsl_pci.h>
> #include "smp.h"
>
> +#if defined(CONFIG_PPC64) && defined(CONFIG_SUSPEND)
> +static void fsl_suspend_disable_irqs(void)
> +{
> + __hard_irq_disable();
> +}
> +#endif

Why the underscore version? Don't you want PACA_IRQ_HARD_DIS to be set?

If hard disabling is appropriate here, shouldn't we do it in
generic_suspend_disable_irqs()?

Are there any existing platforms that supply a
ppc_md.suspend_disable_irqs()? I don't see any when grepping.

-Scott




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