Revision 64b4c411a6c7a5f27555bfc2d6310b87bde3db67 authored by Andrew Morton on 21 October 2022, 04:19:22 UTC, committed by Andrew Morton on 28 October 2022, 20:37:22 UTC
These percpu counters are referenced in free_ipcs->freeque, so destroy
them later.
Fixes: 72d1e611082e ("ipc/msg: mitigate the lock contention with percpu counter")
Reported-by: syzbot+96e659d35b9d6b541152@syzkaller.appspotmail.com
Tested-by: Mark Rutland <mark.rutland@arm.com>
Cc: Jiebin Sun <jiebin.sun@intel.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
1 parent 27d676a
threads.h
/* SPDX-License-Identifier: GPL-2.0 */
#ifndef _LINUX_THREADS_H
#define _LINUX_THREADS_H
/*
* The default limit for the nr of threads is now in
* /proc/sys/kernel/threads-max.
*/
/*
* Maximum supported processors. Setting this smaller saves quite a
* bit of memory. Use nr_cpu_ids instead of this except for static bitmaps.
*/
#ifndef CONFIG_NR_CPUS
/* FIXME: This should be fixed in the arch's Kconfig */
#define CONFIG_NR_CPUS 1
#endif
/* Places which use this should consider cpumask_var_t. */
#define NR_CPUS CONFIG_NR_CPUS
#define MIN_THREADS_LEFT_FOR_ROOT 4
/*
* This controls the default maximum pid allocated to a process
*/
#define PID_MAX_DEFAULT (CONFIG_BASE_SMALL ? 0x1000 : 0x8000)
/*
* A maximum of 4 million PIDs should be enough for a while.
* [NOTE: PID/TIDs are limited to 2^30 ~= 1 billion, see FUTEX_TID_MASK.]
*/
#define PID_MAX_LIMIT (CONFIG_BASE_SMALL ? PAGE_SIZE * 8 : \
(sizeof(long) > 4 ? 4 * 1024 * 1024 : PID_MAX_DEFAULT))
/*
* Define a minimum number of pids per cpu. Heuristically based
* on original pid max of 32k for 32 cpus. Also, increase the
* minimum settable value for pid_max on the running system based
* on similar defaults. See kernel/pid.c:pid_idr_init() for details.
*/
#define PIDS_PER_CPU_DEFAULT 1024
#define PIDS_PER_CPU_MIN 8
#endif
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