From: Niklas Söderlund <niklas.soderlund+rene...@ragnatech.se>
kbuild test robot reports:
In file included from include/linux/skbuff.h:34:0,
from include/linux/icmpv6.h:4,
from include/linux/ipv6.h:75,
from include/net/ipv6.h:16,
from include/linux/sunrpc/clnt.h:27,
from include/linux/nfs_fs.h:30,
from fs/lockd/clntlock.c:13:
include/linux/dma-mapping.h: In function 'dma_map_resource':
>> include/linux/dma-mapping.h:274:16: warning: unused variable 'pfn'
>> [-Wunused-variable]
unsigned long pfn = __phys_to_pfn(phys_addr);
^~~
The pfn value is only used once in the call to pfn_valid(), remove the
variable and calculate the pfn when it's needed. Note that the kbuild
report is old and PHYS_PFN() is now used instead of __phys_to_pfn() to
calculate the pfn.
Signed-off-by: Niklas Söderlund <niklas.soderlund+rene...@ragnatech.se>
---
include/linux/dma-mapping.h | 3 +--
1 file changed, 1 insertion(+), 2 deletions(-)
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index ff7c87f..642cb4c 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -271,13 +271,12 @@ static inline dma_addr_t dma_map_resource(struct device
*dev,
unsigned long attrs)
{
struct dma_map_ops *ops = get_dma_ops(dev);
- unsigned long pfn = PHYS_PFN(phys_addr);
dma_addr_t addr;
BUG_ON(!valid_dma_direction(dir));
/* Don't allow RAM to be mapped */
- BUG_ON(pfn_valid(pfn));
+ BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
addr = phys_addr;
if (ops->map_resource)
--
2.9.3
