On Mon, Jun 22 2015, Peter Zijlstra <[email protected]> wrote: > On Mon, Jun 22, 2015 at 03:16:18PM +0200, Rasmus Villemoes wrote: >> +static struct { >> + struct futex_hash_bucket *queues; >> + unsigned long hashsize; >> +} __futex_data __read_mostly __aligned(16); > > Does: __aligned(sizeof(__futex_data)), work? >
Unfortunately not: kernel/futex.c:265:30: error: ‘__futex_data’ undeclared here (not in a function) kernel/futex.c:265:1: error: requested alignment is not an integer constant > Because 16 might waste 8 bytes on 32bit. Yeah, wasting >= 48 bytes was the reason I didn't make it ____cacheline_aligned. If 8 bytes is also too much, I suppose one could just give the struct a tag and then use sizeof(struct futex_data). Rasmus -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in Please read the FAQ at http://www.tux.org/lkml/
