linux-kernel - Re: [PATCH v2 2/2] x86_64: enable SWIOTLB if system has SRAT memory regions above MAX_DMA32

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Date:	Fri, 4 Dec 2015 13:37:04 +0100
From:	Paolo Bonzini <pbonzini@...hat.com>
To:	Igor Mammedov <imammedo@...hat.com>, Ingo Molnar <mingo@...nel.org>
Cc:	linux-kernel@...r.kernel.org, tglx@...utronix.de, mingo@...hat.com,
	hpa@...or.com, konrad.wilk@...cle.com, akataria@...are.com,
	fujita.tomonori@....ntt.co.jp, revers@...hat.com, riel@...hat.com
Subject: Re: [PATCH v2 2/2] x86_64: enable SWIOTLB if system has SRAT memory
 regions above MAX_DMA32_PFN



On 04/12/2015 13:33, Igor Mammedov wrote:
> That doesn't pass strict type check:
> 
> include/linux/kernel.h:730:17: warning: comparison of distinct pointer types lacks a cast [enabled by default]
>   (void) (&_max1 == &_max2);  \
>                  ^
> arch/x86/mm/srat.c:206:21: note: in expansion of macro ‘max’
>   max_possible_pfn = max(max_possible_pfn, PFN_UP(end - 1));
> 
> I can change max_possible_pfn to u64 to match PFN_UP(end - 1) type.

Sounds like a good idea anyway.

Paolo
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