lkml.org 
[lkml]   [2015]   [Sep]   [18]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
SubjectRe: [PATCH v2 2/9] mm: move __phys_to_pfn and __pfn_to_phys to asm/generic/memory_model.h
From
On Fri, Sep 18, 2015 at 4:42 PM, Tyler Baker <tyler.baker@linaro.org> wrote:
> Hi,
>
> On 25 August 2015 at 18:27, Dan Williams <dan.j.williams@intel.com> wrote:
>> From: Christoph Hellwig <hch@lst.de>
>>
>> Three architectures already define these, and we'll need them genericly
>> soon.
>>
>> Signed-off-by: Christoph Hellwig <hch@lst.de>
>> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
>> ---
>> arch/arm/include/asm/memory.h | 6 ------
>> arch/arm64/include/asm/memory.h | 6 ------
>> arch/unicore32/include/asm/memory.h | 6 ------
>> include/asm-generic/memory_model.h | 6 ++++++
>> 4 files changed, 6 insertions(+), 18 deletions(-)
>>
>> diff --git a/arch/arm/include/asm/memory.h b/arch/arm/include/asm/memory.h
>> index b7f6fb462ea0..98d58bb04ac5 100644
>> --- a/arch/arm/include/asm/memory.h
>> +++ b/arch/arm/include/asm/memory.h
>> @@ -119,12 +119,6 @@
>> #endif
>>
>> /*
>> - * Convert a physical address to a Page Frame Number and back
>> - */
>> -#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
>> -#define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
>> -
>> -/*
>> * Convert a page to/from a physical address
>> */
>> #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
>> diff --git a/arch/arm64/include/asm/memory.h b/arch/arm64/include/asm/memory.h
>> index f800d45ea226..d808bb688751 100644
>> --- a/arch/arm64/include/asm/memory.h
>> +++ b/arch/arm64/include/asm/memory.h
>> @@ -81,12 +81,6 @@
>> #define __phys_to_virt(x) ((unsigned long)((x) - PHYS_OFFSET + PAGE_OFFSET))
>>
>> /*
>> - * Convert a physical address to a Page Frame Number and back
>> - */
>> -#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
>> -#define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
>> -
>> -/*
>> * Convert a page to/from a physical address
>> */
>> #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
>> diff --git a/arch/unicore32/include/asm/memory.h b/arch/unicore32/include/asm/memory.h
>> index debafc40200a..3bb0a29fd2d7 100644
>> --- a/arch/unicore32/include/asm/memory.h
>> +++ b/arch/unicore32/include/asm/memory.h
>> @@ -61,12 +61,6 @@
>> #endif
>>
>> /*
>> - * Convert a physical address to a Page Frame Number and back
>> - */
>> -#define __phys_to_pfn(paddr) ((paddr) >> PAGE_SHIFT)
>> -#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
>> -
>> -/*
>> * Convert a page to/from a physical address
>> */
>> #define page_to_phys(page) (__pfn_to_phys(page_to_pfn(page)))
>> diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h
>> index 14909b0b9cae..f20f407ce45d 100644
>> --- a/include/asm-generic/memory_model.h
>> +++ b/include/asm-generic/memory_model.h
>> @@ -69,6 +69,12 @@
>> })
>> #endif /* CONFIG_FLATMEM/DISCONTIGMEM/SPARSEMEM */
>>
>> +/*
>> + * Convert a physical address to a Page Frame Number and back
>> + */
>> +#define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
>> +#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
>
> The kernelci.org bot has been reporting complete boot failures[1] on
> ARM platforms with more than 4GB of memory and LPAE enabled. I've
> bisected[2] the failures down to this commit, and reverting it on top
> of the latest mainline resolves the boot issue. I took a closer look
> at this patch and noticed the cast to phys_addr_t was dropped in the
> generic function. Adding this to the new generic function solves the
> boot issue I'm reporting.
>
> diff --git a/include/asm-generic/memory_model.h
> b/include/asm-generic/memory_model.h
> index f20f407..db9f5c7 100644
> --- a/include/asm-generic/memory_model.h
> +++ b/include/asm-generic/memory_model.h
> @@ -73,7 +73,7 @@
> * Convert a physical address to a Page Frame Number and back
> */
> #define __phys_to_pfn(paddr) ((unsigned long)((paddr) >> PAGE_SHIFT))
> -#define __pfn_to_phys(pfn) ((pfn) << PAGE_SHIFT)
> +#define __pfn_to_phys(pfn) ((phys_addr_t)(pfn) << PAGE_SHIFT)
>
> #define page_to_pfn __page_to_pfn
> #define pfn_to_page __pfn_to_page
>
> If this fix is valid, I can send a formal patch or it can be squashed
> into the original commit.

This fix is valid, but I wonder if it should just use the existing
PFN_PHYS() definition in include/linux/pfn.h?


\
 
 \ /
  Last update: 2015-09-19 02:21    [W:0.090 / U:1.684 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site