Messages in this thread | | | Subject | Re: replace "memset(...,0,PAGE_SIZE)" calls with "clear_page()"? | From | Arjan van de Ven <> | Date | Sat, 30 Dec 2006 23:45:48 +0100 |
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> i don't see how that can be true, given that most of the definitions > of the clear_page() macro are simply invocations of memset(). see for > yourself:
*MOST*. Not all. For example an SSE version will at least assume 16 byte alignment, etc etc.
clear_page() is supposed to be for full real pages only... for example it allows the architecture to optimize for alignment, cache aliasing etc etc. (and if there are cpus that get a "clear an entire page" instruction.... there has been hardware like that in the past, even on x86, just it's no longer sold afaik)
-- if you want to mail me at work (you don't), use arjan (at) linux.intel.com Test the interaction between Linux and your BIOS via http://www.linuxfirmwarekit.org
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