linux-kernel - [PATCH v2] phys_to_pfn_t: use phys_addr

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Message-ID: <20160122185056.38786.5705.stgit@dwillia2-desk3.amr.corp.intel.com>
Date:	Fri, 22 Jan 2016 10:50:57 -0800
From:	Dan Williams <dan.j.williams@...el.com>
To:	akpm@...ux-foundation.org
Cc:	Matthew Wilcox <willy@...ux.intel.com>,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: [PATCH v2] phys_to_pfn_t: use phys_addr_t

A dma_addr_t is potentially smaller than a phys_addr_t on some archs.
Don't truncate the address when doing the pfn conversion.

Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>
Reported-by: Matthew Wilcox <willy@...ux.intel.com>
[willy: fix pfn_t_to_phys as well]
Signed-off-by: Dan Williams <dan.j.williams@...el.com>
---
 include/linux/pfn_t.h             |    4 ++--
 kernel/memremap.c                 |    2 +-
 tools/testing/nvdimm/test/iomap.c |    2 +-
 3 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/include/linux/pfn_t.h b/include/linux/pfn_t.h
index 0703b5360d31..37448ab5fb5c 100644
--- a/include/linux/pfn_t.h
+++ b/include/linux/pfn_t.h
@@ -29,7 +29,7 @@ static inline pfn_t pfn_to_pfn_t(unsigned long pfn)
 	return __pfn_to_pfn_t(pfn, 0);
 }
 
-extern pfn_t phys_to_pfn_t(dma_addr_t addr, unsigned long flags);
+extern pfn_t phys_to_pfn_t(phys_addr_t addr, unsigned long flags);
 
 static inline bool pfn_t_has_page(pfn_t pfn)
 {
@@ -48,7 +48,7 @@ static inline struct page *pfn_t_to_page(pfn_t pfn)
 	return NULL;
 }
 
-static inline dma_addr_t pfn_t_to_phys(pfn_t pfn)
+static inline phys_addr_t pfn_t_to_phys(pfn_t pfn)
 {
 	return PFN_PHYS(pfn_t_to_pfn(pfn));
 }
diff --git a/kernel/memremap.c b/kernel/memremap.c
index e517a16cb426..7f6d08f41d72 100644
--- a/kernel/memremap.c
+++ b/kernel/memremap.c
@@ -150,7 +150,7 @@ void devm_memunmap(struct device *dev, void *addr)
 }
 EXPORT_SYMBOL(devm_memunmap);
 
-pfn_t phys_to_pfn_t(dma_addr_t addr, unsigned long flags)
+pfn_t phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
 {
 	return __pfn_to_pfn_t(addr >> PAGE_SHIFT, flags);
 }
diff --git a/tools/testing/nvdimm/test/iomap.c b/tools/testing/nvdimm/test/iomap.c
index 7ec7df9e7fc7..0c1a7e65bb81 100644
--- a/tools/testing/nvdimm/test/iomap.c
+++ b/tools/testing/nvdimm/test/iomap.c
@@ -113,7 +113,7 @@ void *__wrap_devm_memremap_pages(struct device *dev, struct resource *res,
 }
 EXPORT_SYMBOL(__wrap_devm_memremap_pages);
 
-pfn_t __wrap_phys_to_pfn_t(dma_addr_t addr, unsigned long flags)
+pfn_t __wrap_phys_to_pfn_t(phys_addr_t addr, unsigned long flags)
 {
 	struct nfit_test_resource *nfit_res = get_nfit_res(addr);