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

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Date:	Thu, 27 Feb 2014 18:19:49 -0800
From:	Stephen Boyd <sboyd@...eaurora.org>
To:	Russ Dill <Russ.Dill@...com>
CC:	Sebastian Capella <sebastian.capella@...aro.org>,
	linux-kernel@...r.kernel.org, linux-pm@...r.kernel.org,
	linaro-kernel@...ts.linaro.org,
	linux-arm-kernel@...ts.infradead.org,
	"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 17:47, Russ Dill wrote:
> On 02/27/2014 04:09 PM, Stephen Boyd wrote:
>> 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?
> From my understanding this needs to stick around so long as gcc 3.x is
> supported (did it get dropped yet?) on ARM Linux since it doesn't
> support -fno-strict-overflow.

I don't think it's been dropped yet but I wonder if anyone has tried
recent kernels with such a compiler?

Would the usage of &__pv_table_begin in arch/arm/mm/mmu.c also need the
same treatment? Or the tagtable loop in atags_parse.c? Do the other
architectures also need to be fixed? That link Sebastian points to says
that ppc originally needed it but pfn_is_nosave() on ppc doesn't use
RELOC_HIDE anywhere in their __pa() macro from what I can tell.

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

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