Re: [PATCH 5/5] lockdep: pack subclass/trylock/read/check into asingle argument

[Oleg Nesterov]

On 01/21, Peter Zijlstra wrote:
>
> I tried the below but filed to see my vmlinux shrink, maybe I'm just not
> building the right kernel, or otherwise GCC is stupid.

...

> +struct lockdep_acquire_flags {
> +	unsigned long subclass : 3;
> +	unsigned long trylock  : 1;
> +	unsigned long read     : 2;
> +	unsigned long check    : 1;
> +};

Yes, I tried this too. I do see the difference, but the result is worse:

	- 5262832
	+ 5256987

looks like, gcc is not smart enough...

Oleg.

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