admin-guide/hw-vuln/core-scheduling: fix return type of PR_SCHED_CORE_GET

stable inclusion
from stable-v6.6.32
commit 1266e5a8f5bceb828bf3456fee08c0a81bd9b283
bugzilla: https://gitee.com/openeuler/kernel/issues/IA4MGD

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=1266e5a8f5bceb828bf3456fee08c0a81bd9b283

--------------------------------

commit 8af2d1ab78f2342f8c4c3740ca02d86f0ebfac5a upstream.

sched_core_share_pid() copies the cookie to userspace with
put_user(id, (u64 __user *)uaddr), expecting 64 bits of space.
The "unsigned long" datatype that is documented in core-scheduling.rst
however is only 32 bits large on 32 bit architectures.

Document "unsigned long long" as the correct data type that is always
64bits large.

This matches what the selftest cs_prctl_test.c has been doing all along.

Fixes: 0159bb02 ("Documentation: Add usecases, design and interface for core scheduling")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/util-linux/df7a25a0-7923-4f8b-a527-5e6f0064074d@t-8ch.de/


Signed-off-by: Thomas Weißschuh <linux@weissschuh.net>
Reviewed-by: Chris Hyser <chris.hyser@oracle.com>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Link: https://lore.kernel.org/r/20240423-core-scheduling-cookie-v1-1-5753a35f8dfc@weissschuh.net


Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: ZhangPeng <zhangpeng362@huawei.com>