linux-kernel - Re: [PATCH v6 2/2] ARM hibernation / suspend-to-disk

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Date:	Thu, 27 Feb 2014 16:09:51 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Sebastian Capella <sebastian.capella@...aro.org>
CC:	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linaro-kernel@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org, Russ Dill <Russ.Dill@...com>,
	"Rafael J. Wysocki" <rjw@...ysocki.net>,
	Russell King <linux@....linux.org.uk>,
	Len Brown <len.brown@...el.com>,
	Nicolas Pitre <nico@...aro.org>,
	Santosh Shilimkar <santosh.shilimkar@...com>,
	Will Deacon <will.deacon@....com>,
	Jonathan Austin <jonathan.austin@....com>,
	Catalin Marinas <catalin.marinas@....com>,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>,
	Lorenzo Pieralisi <lorenzo.pieralisi@....com>
Subject: Re: [PATCH v6 2/2] ARM hibernation / suspend-to-disk

On 02/27/14 15:57, Sebastian Capella wrote:
> diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
> index 8756e4b..1079ea8 100644
> --- a/arch/arm/include/asm/memory.h
> +++ b/arch/arm/include/asm/memory.h
> @@ -291,6 +291,7 @@ static inline void *phys_to_virt(phys_addr_t x)
>   */
>  #define __pa(x)			__virt_to_phys((unsigned long)(x))
>  #define __va(x)			((void *)__phys_to_virt((phys_addr_t)(x)))
> +#define __pa_symbol(x)		__pa(RELOC_HIDE((unsigned long)(x), 0))

Just curious, is there a reason for the RELOC_HIDE() here? Or
__pa_symbol() for that matter? It looks like only x86 uses this on the
__nosave_{begin,end} symbol. Maybe it's copy-pasta?

I also wonder if anyone has thought about making a __weak
pfn_is_nosave() function so that architectures don't need to implement
the same thing every time. Consolidating those shouldn't be part of this
patch though.

-- 
Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum,
hosted by The Linux Foundation

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