linux-kernel - [PATCH] nvdimm: use 'u64' for pfn flags

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Date:	Mon, 22 Feb 2016 22:58:34 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Dan Williams <dan.j.williams@...el.com>
Cc:	linux-arm-kernel@...ts.infradead.org,
	Arnd Bergmann <arnd@...db.de>,
	Stuart Foster <smf.linux@...world.com>,
	Julian Margetson <runaway@...dw.ms>,
	Andrew Morton <akpm@...ux-foundation.org>, linux-mm@...ck.org,
	Ross Zwisler <ross.zwisler@...ux.intel.com>,
	linux-nvdimm@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [PATCH] nvdimm: use 'u64' for pfn flags

A recent bugfix changed pfn_t to always be 64-bit wide, but did not
change the code in pmem.c, which is now broken on 32-bit architectures
as reported by gcc:

In file included from ../drivers/nvdimm/pmem.c:28:0:
drivers/nvdimm/pmem.c: In function 'pmem_alloc':
include/linux/pfn_t.h:15:17: error: large integer implicitly truncated to unsigned type [-Werror=overflow]
 #define PFN_DEV (1ULL << (BITS_PER_LONG_LONG - 3))

This changes the intermediate pfn_flags in struct pmem_device to
be 64 bit wide as well, so they can store the flags correctly.

Signed-off-by: Arnd Bergmann <arnd@...db.de>
Fixes: db78c22230d0 ("mm: fix pfn_t vs highmem")
---
 drivers/nvdimm/pmem.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/nvdimm/pmem.c b/drivers/nvdimm/pmem.c
index 7edf31671dab..8d0b54670184 100644
--- a/drivers/nvdimm/pmem.c
+++ b/drivers/nvdimm/pmem.c
@@ -41,7 +41,7 @@ struct pmem_device {
 	phys_addr_t		phys_addr;
 	/* when non-zero this device is hosting a 'pfn' instance */
 	phys_addr_t		data_offset;
-	unsigned long		pfn_flags;
+	u64			pfn_flags;
 	void __pmem		*virt_addr;
 	size_t			size;
 	struct badblocks	bb;
-- 
2.7.0