Re: [PATCH v3 0/4] Generalize fncpy availability

From: Mark Rutland
Date: Mon Jun 19 2017 - 08:25:51 EST

On Fri, Jun 16, 2017 at 05:07:40PM -0700, Florian Fainelli wrote:
> Hi all,

Hi Florian,

> This patch series makes ARM's fncpy() implementation more generic (dropping the
> Thumb-specifics) and available in an asm-generic header file.
> Tested on a Broadcom ARM64 STB platform with code that is written to SRAM.
> Changes in v3 (thanks Doug!):
> - correct include guard names in asm-generic/fncpy.h to __ASM_FNCPY_H
> - utilize Kbuild to provide the fncpy.h header on ARM64
> Changes in v2:
> - leave the ARM implementation where it is
> - make the generic truly generic (no)
> This is helpful in making SoC-specific power management code become true drivers
> that can be shared between different architectures.

Could you elaborate on what this is needed for?

My understanding was that on 32-bit, this was to handle idle / suspend
cases, whereas for arm64 that should be handled by PSCI.

what exactly do you intend to use this for?