Re: [PATCH] x86: bpf_jit_comp: simplify trivial boolean return

From: Alexei Starovoitov
Date: Thu Dec 04 2014 - 10:57:00 EST


On Thu, Dec 4, 2014 at 1:26 AM, Joe Perches <joe@xxxxxxxxxxx> wrote:
> On Thu, 2014-11-27 at 10:49 -0800, Joe Perches wrote:
>> On Thu, 2014-11-27 at 12:25 +0000, David Laight wrote:
>> > Why the change in data?
>>
>> btw: without gcov and using -O2
>>
>> $ size arch/x86/net/bpf_jit_comp.o*
>> text data bss dec hex filename
>> 9671 4 0 9675 25cb arch/x86/net/bpf_jit_comp.o.new
>> 10679 4 0 10683 29bb arch/x86/net/bpf_jit_comp.o.old
>
> Alexei?
>
> Is this 10% reduction in size a good reason to change the code?

yes.
I believe you're seeing it with gcc 4.9. I wanted to double
check what 4.6 and 4.7 are doing. If they're not suddenly
increase code size then resubmit it for inclusion please.
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/