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bianbu-linux-6.6/kernel/rcu
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Zqiang b3b2431ed2 rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb() 
[ Upstream commit fd70e9f1d85f5323096ad313ba73f5fe3d15ea41 ]

For kernels built with CONFIG_FORCE_NR_CPUS=y, the nr_cpu_ids is
defined as NR_CPUS instead of the number of possible cpus, this
will cause the following system panic:

smpboot: Allowing 4 CPUs, 0 hotplug CPUs
...
setup_percpu: NR_CPUS:512 nr_cpumask_bits:512 nr_cpu_ids:512 nr_node_ids:1
...
BUG: unable to handle page fault for address: ffffffff9911c8c8
Oops: 0000 [#1] PREEMPT SMP PTI
CPU: 0 PID: 15 Comm: rcu_tasks_trace Tainted: G W
6.6.21 #1 5dc7acf91a5e8e9ac9dcfc35bee0245691283ea6
RIP: 0010:rcu_tasks_need_gpcb+0x25d/0x2c0
RSP: 0018:ffffa371c00a3e60 EFLAGS: 00010082
CR2: ffffffff9911c8c8 CR3: 000000040fa20005 CR4: 00000000001706f0
Call Trace:
<TASK>
? __die+0x23/0x80
? page_fault_oops+0xa4/0x180
? exc_page_fault+0x152/0x180
? asm_exc_page_fault+0x26/0x40
? rcu_tasks_need_gpcb+0x25d/0x2c0
? __pfx_rcu_tasks_kthread+0x40/0x40
rcu_tasks_one_gp+0x69/0x180
rcu_tasks_kthread+0x94/0xc0
kthread+0xe8/0x140
? __pfx_kthread+0x40/0x40
ret_from_fork+0x34/0x80
? __pfx_kthread+0x40/0x40
ret_from_fork_asm+0x1b/0x80
</TASK>

Considering that there may be holes in the CPU numbers, use the
maximum possible cpu number, instead of nr_cpu_ids, for configuring
enqueue and dequeue limits.

[ neeraj.upadhyay: Fix htmldocs build error reported by Stephen Rothwell ]

Closes: https://lore.kernel.org/linux-input/CALMA0xaTSMN+p4xUXkzrtR5r6k7hgoswcaXx7baR_z9r5jjskw@mail.gmail.com/T/#u
Reported-by: Zhixu Liu <zhixu.liu@gmail.com>
Signed-off-by: Zqiang <qiang.zhang1211@gmail.com>
Signed-off-by: Neeraj Upadhyay <neeraj.upadhyay@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2024-11-08 16:28:22 +01:00
..
Kconfig rcu: Employ jiffies-based backstop to callback time limit 2023-05-11 13:42:39 -07:00
Kconfig.debug rcu: Allow up to five minutes expedited RCU CPU stall-warning timeouts 2023-01-09 12:09:52 -08:00
Makefile rcuperf: Change rcuperf to rcuscale 2020-08-24 18:39:24 -07:00
rcu.h rcu: Dump memory object info if callback function is invalid 2024-08-29 17:33:23 +02:00
rcu_segcblist.c rcu: Throttle callback invocation based on number of ready callbacks 2023-01-03 17:28:34 -08:00
rcu_segcblist.h rcu: Throttle callback invocation based on number of ready callbacks 2023-01-03 17:28:34 -08:00
rcuscale.c rcuscale: Provide clear error when async specified without primitives 2024-10-10 11:57:31 +02:00
rcutorture.c rcutorture: Fix rcu_torture_fwd_cb_cr() data race 2024-08-14 13:58:41 +02:00
refscale.c refscale: Add a "jiffies" test 2023-07-14 15:01:04 -07:00
srcutiny.c rcu: Dump memory object info if callback function is invalid 2024-08-29 17:33:23 +02:00
srcutree.c rcu: Dump memory object info if callback function is invalid 2024-08-29 17:33:23 +02:00
sync.c rcu/sync: Use call_rcu_hurry() instead of call_rcu 2022-11-29 14:04:33 -08:00
tasks.h rcu-tasks: Fix access non-existent percpu rtpcp variable in rcu_tasks_need_gpcb() 2024-11-08 16:28:22 +01:00
tiny.c rcu: Dump memory object info if callback function is invalid 2024-08-29 17:33:23 +02:00
tree.c rcu/nocb: Make IRQs disablement symmetric 2024-10-17 15:24:30 +02:00
tree.h rcu/nocb: Remove buggy bypass lock contention mitigation 2024-09-08 07:54:44 +02:00
tree_exp.h rcu/exp: Handle RCU expedited grace period kworker allocation failure 2024-03-26 18:19:17 -04:00
tree_nocb.h rcu/nocb: Fix rcuog wake-up from offline softirq 2024-10-17 15:24:30 +02:00
tree_plugin.h rcu: Mark additional concurrent load from ->cpu_no_qs.b.exp 2023-05-11 13:42:39 -07:00
tree_stall.h rcu: Fix buffer overflow in print_cpu_stall_info() 2024-06-12 11:11:32 +02:00
update.c Merge branch 'stall.2023.01.09a' into HEAD 2023-02-02 16:40:07 -08:00