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SubjectRe: [PATCH] Re: 2.5.3-pre1 compile error
Linus Torvalds wrote:

> > Well, I actually disagree on this. For large include files (fs.h is the
> > worst), and complicated arrangement, this technique eliminates spurious
> > includes and saves a lot on compile time (really!).
> Numbers please.

The GNU C preprocessor remembers if an include file was completely
inside an #ifndef/#endif conditional (modulo whitespace and comments)
and will skip the #include for the same file if the macro in #ifndef is
already defined. I suspect putting guards around the include will not
save any more time.

Christopher Turcksin <>

IBM Global Services
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