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Date: Wed, 07 Aug 2013 09:32:02 +0530
From: Anshuman Khandual <khandual@linux.vnet.ibm.com>
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To: Madhavan Srinivasan <maddy@linux.vnet.ibm.com>
Subject: Re: [PATCH] powerpc: Convert out of line __arch_hweight to inline
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> 
>  obj-$(CONFIG_PPC64)	+= copypage_64.o copyuser_64.o \
>  			   memcpy_64.o usercopy_64.o mem_64.o string.o \
> -			   checksum_wrappers_64.o hweight_64.o \
> +			   checksum_wrappers_64.o \
>  			   copyuser_power7.o string_64.o copypage_power7.o \
>  			   memcpy_power7.o
>  obj-$(CONFIG_PPC_EMULATE_SSTEP)	+= sstep.o ldstfp.o
> 

As you have moved all the code from hweight_64.S file and removed it from the
compilation list in the Makefile, you need to delete the file from the directory as well.