RE: [RFC] net: bpf_jit: Two pass JIT and other changes

["Indan Zupancic" <indan@nul.nu>]

On Mon, April 2, 2012 19:28, David Laight wrote:
>
>> 1) Sadly, gcc isn't always smart enough to inline emit_code().
>>    So turn it into a macro to force gcc to inline it. This saves
>>    about 500 bytes. Tested with gcc 4.6.0. An alternative to the
>>    macro would be to create inline emit_code1(), emit_code2() etc.
>
> Does giving it the __attribute__((always_inline)) help?
> I had to mark a load of small static functions that way
> after a minor change (possibly to the overall size)
> stopped gcc inlining everything.

I did try that first, but it didn't work for some reason. Perhaps
the kernel uses some flag that overrides it when optimising for size.
Maybe plain -Os does that already, I don't know.

Greetings,

Indan