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SubjectRe: [PATCH 5/5] lockdep: pack subclass/trylock/read/check into a single argument
On Tue, Jan 21, 2014 at 03:10:22PM +0100, 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.
>
> -extern void lock_acquire(struct lockdep_map *lock, unsigned int subclass,
> - int trylock, int read, int check,
> - struct lockdep_map *nest_lock, unsigned long ip);
> +struct lockdep_acquire_flags {
> + unsigned long subclass : 3;
> + unsigned long trylock : 1;
> + unsigned long read : 2;
> + unsigned long check : 1;
> +};

As it's only 7 bits here, could we pack them into a char ?

Dave



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