/* * Lock & load the kernel context for the specified blade. */ static struct gru_blade_state *gru_lock_kernel_context(int blade_id) { struct gru_blade_state *bs; STAT(lock_kernel_context); bs = gru_base[blade_id]; down_read(&bs->bs_kgts_sema); if (!bs->bs_kgts || !bs->bs_kgts->ts_gru) gru_load_kernel_context(bs, blade_id); return bs; }
/* * Lock & load the kernel context for the specified blade. */ static struct gru_blade_state *gru_lock_kernel_context(int blade_id) { struct gru_blade_state *bs; int bid; STAT(lock_kernel_context); again: bid = blade_id < 0 ? uv_numa_blade_id() : blade_id; bs = gru_base[bid]; /* Handle the case where migration occurred while waiting for the sema */ down_read(&bs->bs_kgts_sema); if (blade_id < 0 && bid != uv_numa_blade_id()) { up_read(&bs->bs_kgts_sema); goto again; } if (!bs->bs_kgts || !bs->bs_kgts->ts_gru) gru_load_kernel_context(bs, bid); return bs; }
static struct gru_blade_state *gru_lock_kernel_context(int blade_id) { struct gru_blade_state *bs; int bid; STAT(lock_kernel_context); again: bid = blade_id < 0 ? uv_numa_blade_id() : blade_id; bs = gru_base[bid]; /* */ down_read(&bs->bs_kgts_sema); if (blade_id < 0 && bid != uv_numa_blade_id()) { up_read(&bs->bs_kgts_sema); goto again; } if (!bs->bs_kgts || !bs->bs_kgts->ts_gru) gru_load_kernel_context(bs, bid); return bs; }