dma-mapping: fix m32r build warning
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+renesas@ragnatech.se> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
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@ -271,13 +271,12 @@ static inline dma_addr_t dma_map_resource(struct device *dev,
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unsigned long attrs)
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{
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struct dma_map_ops *ops = get_dma_ops(dev);
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unsigned long pfn = PHYS_PFN(phys_addr);
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dma_addr_t addr;
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BUG_ON(!valid_dma_direction(dir));
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/* Don't allow RAM to be mapped */
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BUG_ON(pfn_valid(pfn));
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BUG_ON(pfn_valid(PHYS_PFN(phys_addr)));
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addr = phys_addr;
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if (ops->map_resource)
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