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Date:   Wed,  6 May 2020 12:51:02 +1000 (AEST)
From:   Michael Ellerman <>
To:     "Gautham R. Shenoy" <>,
        Nathan Lynch <>,
        Vaidyanathan Srinivasan <>,
        Kamalesh Babulal <>,
        "Naveen N. Rao" <>,
        Tyrel Datwyler <>
Cc:     "Gautham R. Shenoy" <>,,
Subject: Re: [PATCH v5 1/5] powerpc: Move idle_loop_prolog()/epilog() functions to header file

On Tue, 2020-04-07 at 08:47:39 UTC, "Gautham R. Shenoy" wrote:
> From: "Gautham R. Shenoy" <>
> Currently prior to entering an idle state on a Linux Guest, the
> pseries cpuidle driver implement an idle_loop_prolog() and
> idle_loop_epilog() functions which ensure that idle_purr is correctly
> computed, and the hypervisor is informed that the CPU cycles have been
> donated.
> These prolog and epilog functions are also required in the default
> idle call, i.e pseries_lpar_idle(). Hence move these accessor
> functions to a common header file and call them from
> pseries_lpar_idle(). Since the existing header files such as
> asm/processor.h have enough clutter, create a new header file
> asm/idle.h. Finally rename idle_loop_prolog() and idle_loop_epilog()
> to pseries_idle_prolog() and pseries_idle_epilog() as they are only
> relavent for on pseries guests.
> Signed-off-by: Gautham R. Shenoy <>

Series applied to powerpc next, thanks.


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