Messages in this thread |  | | | Date | Sat, 22 Sep 2007 11:53:53 -0700 (PDT) | | From | Linus Torvalds <> | | Subject | Re: memset as memzero |
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On Sat, 22 Sep 2007, Arjan van de Ven wrote: > > it doesn't add value.... memset with a constant 0 is just as fast > (since the compiler knows it's 0) than any wrapper around it, and the > syntax around it is otherwise the same.
Indeed.
The reason we have "clear_page()" is not because the value we're writing is constant - that doesn't really help/change anything at all. We could have had a "fill_page()" that sets the value to any random byte, it's just that zero is the only value that we really care about.
So the reason we have "clear_page()" is because the *size* and *alignment* is constant and known at compile time, and unlike the value you write, that actually matters.
So "memzero()" would never really make sense as anything but a syntactic wrapper around "memset(x,0,size)".
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