Gmane
From: Linus Torvalds <torvalds <at> linux-foundation.org>
Subject: Re: 2.6.23-rc1: BUG_ON in kmap_atomic_prot()
Newsgroups: gmane.linux.network, gmane.linux.kernel
Date: 2007-07-24 19:48:13 GMT (2 years, 28 weeks, 4 days, 19 hours and 32 minutes ago)

On Tue, 24 Jul 2007, Adrian Bunk wrote:
> 
> > But do we 
> > care so much that it's worth inlining something like buffered_rmqueue()? 
> >...
> 
> Where is the problem with having buffered_rmqueue() inlined?

In this case, it was a pain to just even try to find the call chain, or 
read the asm.

I would encourage lots of kernel hackers to read the assembler code gcc 
generates. I suspect people being aware of code generation issues (and 
writing their code with that in mind) is a *much* bigger performance 
impact than gcc inlining random functions.

So maybe I'm old-fashioned and crazy, but "readability of the asm result" 
actually is a worthwhile goal. Not because we care directly, but because 
I'd like to encourage people to do it, due to the *indirect* benefits.

		Linus
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