Re: [Bug #11342] Linux 2.6.27-rc3: kernel BUG at mm/vmalloc.c -bisected

[Linus Torvalds]

On Tue, 26 Aug 2008, Adrian Bunk wrote:
> 
> I added "-fno-inline-functions-called-once -fno-early-inlining" to 
> KBUILD_CFLAGS, and (with gcc 4.3) that increased the size of my kernel 
> image by 2%.

Btw, did you check with just "-fno-inline-functions-called-once"?

The -fearly-inlining decisions _should_ be mostly right. If gcc sees early 
that a function is so small (even without any constant propagation etc) 
that it can be inlined, it's probably right. 

The inline-functions-called-once thing is what causes even big functions 
to be inlined, and that's where you find the big downsides too (eg the 
stack usage).

			Linus
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