From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail-wi0-f178.google.com (mail-wi0-f178.google.com [209.85.212.178]) by kanga.kvack.org (Postfix) with ESMTP id 37E946B0038 for ; Fri, 18 Sep 2015 19:59:10 -0400 (EDT) Received: by wicgb1 with SMTP id gb1so50692396wic.1 for ; Fri, 18 Sep 2015 16:59:09 -0700 (PDT) Received: from mail-wi0-f171.google.com (mail-wi0-f171.google.com. [209.85.212.171]) by mx.google.com with ESMTPS id v15si14802829wju.57.2015.09.18.16.59.08 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Fri, 18 Sep 2015 16:59:08 -0700 (PDT) Received: by wicfx3 with SMTP id fx3so48395105wic.0 for ; Fri, 18 Sep 2015 16:59:08 -0700 (PDT) MIME-Version: 1.0 In-Reply-To: References: <20150826010220.8851.18077.stgit@dwillia2-desk3.amr.corp.intel.com> <20150826012735.8851.49787.stgit@dwillia2-desk3.amr.corp.intel.com> Date: Fri, 18 Sep 2015 16:59:08 -0700 Message-ID: Subject: Re: [PATCH v2 2/9] mm: move __phys_to_pfn and __pfn_to_phys to asm/generic/memory_model.h From: Dan Williams Content-Type: text/plain; charset=UTF-8 Sender: owner-linux-mm@kvack.org List-ID: To: Tyler Baker Cc: "linux-nvdimm@lists.01.org" , Boaz Harrosh , david , "linux-kernel@vger.kernel.org" , Christoph Hellwig , Linux MM , "H. Peter Anvin" , Ross Zwisler , Ingo Molnar , Kevin's boot bot On Fri, Sep 18, 2015 at 4:42 PM, Tyler Baker wrote: > Hi, > > On 25 August 2015 at 18:27, Dan Williams wrote: >> From: Christoph Hellwig >> >> Three architectures already define these, and we'll need them genericly >> soon. >> >> Signed-off-by: Christoph Hellwig >> Signed-off-by: Dan Williams >> --- >> 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? -- To unsubscribe, send a message with 'unsubscribe linux-mm' in the body to majordomo@kvack.org. For more info on Linux MM, see: http://www.linux-mm.org/ . Don't email: email@kvack.org