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c79f01b6eb
The following BUG message was triggered repeatedly when complete counter
sets are extracted from the CPUMF:
BUG: using smp_processor_id() in preemptible [00000000]
code: psvc-readsets/7759
caller is cf_diag_needspace+0x2c/0x100
CPU: 7 PID: 7759 Comm: psvc-readsets Not tainted 5.12.0
Hardware name: IBM 3906 M03 703 (LPAR)
Call Trace:
[<00000000c7043f78>] show_stack+0x90/0xf8
[<00000000c705776a>] dump_stack+0xba/0x108
[<00000000c705d91c>] check_preemption_disabled+0xec/0xf0
[<00000000c63eb1c4>] cf_diag_needspace+0x2c/0x100
[<00000000c63ecbcc>] cf_diag_ioctl_start+0x10c/0x240
[<00000000c63ece9a>] cf_diag_ioctl+0x19a/0x238
[<00000000c675f3f4>] __s390x_sys_ioctl+0xc4/0x100
[<00000000c63ca762>] do_syscall+0x82/0xd0
[<00000000c705bdd8>] __do_syscall+0xc0/0xd8
[<00000000c706d532>] system_call+0x72/0x98
2 locks held by psvc-readsets/7759:
#0: 00000000c75a57c0 (cpu_hotplug_lock){++++}-{0:0},
at: cf_diag_ioctl+0x44/0x238
#1: 00000000c75a3078 (cf_diag_ctrset_mutex){+.+.}-{3:3},
at: cf_diag_ioctl+0x54/0x238
This issue is a missing get_cpu_ptr/put_cpu_ptr pair in function
cf_diag_needspace. Add it.
Fixes: cf6acb8bdb ("s390/cpumf: Add support for complete counter set extraction")
Reviewed-by: Heiko Carstens <hca@linux.ibm.com>
Signed-off-by: Thomas Richter <tmricht@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.