[PATCH 2/3] arm64: Add big.LITTLE switcher stub
From: broonie@kernel.org (Mark Brown)
Date: 2014-05-09 18:01:21
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linux-pm
On Fri, May 09, 2014 at 06:47:38PM +0100, Catalin Marinas wrote:
On Fri, May 09, 2014 at 05:40:30PM +0100, Mark Brown wrote:
quoted
The big.LITTLE cpufreq driver is useful on arm64 big.LITTLE systems even without IKS support since it implements support for clusters with shared clocks (a common big.LITTLE configuration). In order to allow it to be built provide the non-IKS stubs for arm64, enabling cpufreq with all the cores available.
Have you thought of patching the actual cpufreq driver? Are you adding this code just to avoid compiler errors on arm64 with this driver?
Yes, that was actually my first thought but I wasn't loving the ifdeferry - it's fairly easy to do IIRC but the general taste seems to be towards having stubs rather than ifdefs and the code seemed to be lending itself to that. There was also the fact that ifdefs could have been done for the non-IKS case on 32 bit but instead stubs were provided. If people prefer I can do an ifdeffed version though, it doesn't make much odds. This was purely to get the driver compiling and hopefully running on ARMv8, there is some user demand for deploying the driver on big.LITTLE systems.
quoted
It may make sense to make an asm-generic version of these stubs instead
asm-generic/bL_switcher.h? I take it as a good joke ;)
Hey, perhaps other hardware architectures are implementing similar concepts even now in order to keep up! :P -------------- next part -------------- A non-text attachment was scrubbed... Name: signature.asc Type: application/pgp-signature Size: 836 bytes Desc: Digital signature URL: <http://lists.infradead.org/pipermail/linux-arm-kernel/attachments/20140509/bf2274cf/attachment.sig>