diff options
| author | Tejun Heo <tj@kernel.org> | 2026-09-14 22:12:34 -1000 |
|---|---|---|
| committer | Tejun Heo <tj@kernel.org> | 2026-09-15 06:57:20 -1000 |
| commit | a9e3760b0838299649c0d57cca44daaf40ba3c33 (patch) | |
| tree | 95807ff0e511c05602ef34808cfc660303309057 /include/net/ipconfig.h | |
| download | linux-stable-a9e3760b0838299649c0d57cca44daaf40ba3c33.tar.gz linux-stable-a9e3760b0838299649c0d57cca44daaf40ba3c33.zip | |
sched_ext: Maintain an online cid mask in the scheduler arenagrafted
Schedulers on the default cid mapping treat [0, nr_online_cids) as the
online set and restart on hotplug. Schedulers that install their own mapping
with scx_bpf_cid_override() have no way to learn which cids are online: the
count no longer identifies members and the CPU-form cpumask is unusable from
cid programs. This is an obvious hole in the cid API.
Add scx_bpf_online_cmask(), a kernel-maintained cmask in the scheduler's
arena, allocated alongside the per-CPU scratch masks and populated after the
cid mapping is finalized and before ops.init(), for child schedulers too.
The pointer stays valid through ops.exit() with no reference to take. It is
the arena offset as a void pointer, the same form struct_ops arena arguments
arrive in. The verifier types the void return as a scalar for the program's
arena cast.
The mask follows the SCX hotplug notifications: seeded from cpu_active_mask
and updated before ops.cid_online/offline() runs, so it lags cpu_online_mask
only inside a hotplug transition. Updates walk the scheduler list under the
lock that also serializes unlinking. Reads are live, not atomic snapshots.
Root initialization excludes hotplug.
v2: Reworded the getter kerneldoc (Andrea Righi).
Signed-off-by: Tejun Heo <tj@kernel.org>
Reviewed-by: Andrea Righi <arighi@nvidia.com>
Diffstat (limited to 'include/net/ipconfig.h')
| -rw-r--r-- | include/net/ipconfig.h | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/include/net/ipconfig.h b/include/net/ipconfig.h new file mode 100644 index 000000000..8276897d0 --- /dev/null +++ b/include/net/ipconfig.h @@ -0,0 +1,28 @@ +/* SPDX-License-Identifier: GPL-2.0 */ +/* + * Copyright (C) 1997 Martin Mares + * + * Automatic IP Layer Configuration + */ + +/* The following are initdata: */ + +#include <linux/types.h> + +extern int ic_proto_enabled; /* Protocols enabled (see IC_xxx) */ +extern int ic_set_manually; /* IPconfig parameters set manually */ + +extern __be32 ic_myaddr; /* My IP address */ +extern __be32 ic_gateway; /* Gateway IP address */ + +extern __be32 ic_servaddr; /* Boot server IP address */ + +extern __be32 root_server_addr; /* Address of NFS server */ +extern u8 root_server_path[]; /* Path to mount as root */ + + +/* bits in ic_proto_{enabled,used} */ +#define IC_PROTO 0xFF /* Protocols mask: */ +#define IC_BOOTP 0x01 /* BOOTP (or DHCP, see below) */ +#define IC_RARP 0x02 /* RARP */ +#define IC_USE_DHCP 0x100 /* If on, use DHCP instead of BOOTP */ |