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Date: Fri, 18 Sep 2015 23:49:09 -0700 From: Tyler Baker <tyler.baker@...aro.org> To: Dan Williams <dan.j.williams@...el.com> Cc: "linux-nvdimm@...ts.01.org" <linux-nvdimm@...ts.01.org>, Boaz Harrosh <boaz@...xistor.com>, david <david@...morbit.com>, "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, Christoph Hellwig <hch@....de>, Linux MM <linux-mm@...ck.org>, "H. Peter Anvin" <hpa@...or.com>, Ross Zwisler <ross.zwisler@...ux.intel.com>, Ingo Molnar <mingo@...nel.org>, "Kevin's boot bot" <khilman@...nel.org> Subject: Re: [PATCH v2 2/9] mm: move __phys_to_pfn and __pfn_to_phys to asm/generic/memory_model.h On 18 September 2015 at 16:59, Dan Williams <dan.j.williams@...el.com> wrote: > On Fri, Sep 18, 2015 at 4:42 PM, Tyler Baker <tyler.baker@...aro.org> wrote: >> Hi, >> >> On 25 August 2015 at 18:27, Dan Williams <dan.j.williams@...el.com> wrote: >>> From: Christoph Hellwig <hch@....de> >>> >>> Three architectures already define these, and we'll need them genericly >>> soon. >>> >>> Signed-off-by: Christoph Hellwig <hch@....de> >>> Signed-off-by: Dan Williams <dan.j.williams@...el.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? Good suggestion, seems like the rational thing to do. FWIW, I gave the patch below a spin through the kernelci.org build/boot ci loop[1]. All went well, no new regressions were detected. From: Tyler Baker <tyler.baker@...aro.org> Date: Fri, 18 Sep 2015 17:56:26 -0700 Subject: [PATCH] mm: fix type cast in __pfn_to_phys() The various definitions of __pfn_to_phys() have been consolidated to use a generic macro in include/asm-generic/memory_model.h. This hit mainline in the form of 012dcef3f058 "mm: move __phys_to_pfn and __pfn_to_phys to asm/generic/memory_model.h". When the generic macro was implemented the type cast to phys_addr_t was dropped which caused boot regressions on ARM platforms with more than 4GB of memory and LPAE enabled. It was suggested to use PFN_PHYS() defined in include/linux/pfn.h as provides the correct logic and avoids further duplication. Reported-by: kernelci.org bot <bot@...nelci.org> Suggested-by: Dan Williams <dan.j.williams@...el.com> Signed-off-by: Tyler Baker <tyler.baker@...aro.org> --- include/asm-generic/memory_model.h | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/include/asm-generic/memory_model.h b/include/asm-generic/memory_model.h index f20f407..4b4b056 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) PFN_PHYS(pfn) #define page_to_pfn __page_to_pfn #define pfn_to_page __pfn_to_page -- 2.1.4 Cheers, Tyler [1] http://kernelci.org/boot/all/job/tbaker/kernel/v4.3-rc1-221-ge75368554bf8/ -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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