flush_dcache_page()

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Hi List,
 
I was going through the kernel source 2.6.16 and i came across the function call flush_dcache_page() inside function generic_file_buffered_write() (mm/filemap.c).
It is defined as :
 

#define flush_dcache_page(page)                 do { } while (0)
in file include/asm-i386/cacheflush.h
 
Does it solve any purpose?
 
Rgds,
Adil

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