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/*
 * netsniff-ng - the packet sniffing beast
 * Copyright 2009, 2010 Daniel Borkmann.
 * Subject to the GPL, version 2.
 */

#ifndef DIE_H 
#define DIE_H

#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <string.h>
#include <errno.h>
#include <unistd.h>
#include <syslog.h>

#include "built_in.h"

static inline void panic(const char *format, ...)  __check_format_printf(1, 2);
static inline void syslog_panic(const char *format,
				...) __check_format_printf(1, 2);
static inline void syslog_maybe(int may, int priority,
				const char *format, ...) __check_format_printf(3, 4);

static inline void __noreturn die(void)
{
	exit(EXIT_FAILURE);
}

static inline void __noreturn _die(void)
{
	_exit(EXIT_FAILURE);
}

static inline void __noreturn panic(const char *format, ...)
{
	va_list vl;

	va_start(vl, format);
	vfprintf(stderr, format, vl);
	va_end(vl);

	die();
}

static inline void __noreturn syslog_panic(const char *format, ...)
{
	va_list vl;

	va_start(vl, format);
	vsyslog(LOG_ERR, format, vl);
	va_end(vl);

	die();
}

static inline void syslog_maybe(int maybe, int priority, const char *format, ...)
{
	if (!!maybe) {
		va_list vl;

		va_start(vl, format);
		vsyslog(priority, format, vl);
		va_end(vl);
	}
}

#endif /* DIE_H */
Now there is no intersection between cpu_online_mask and top_cpuset.effective_cpus. Thus invoking sys_sched_setaffinity() at this moment can cause following: Unable to handle kernel NULL pointer dereference at virtual address 000000d0 ------------[ cut here ]------------ Kernel BUG at ffffffc0001389b0 [verbose debug info unavailable] Internal error: Oops - BUG: 96000005 [#1] PREEMPT SMP Modules linked in: CPU: 2 PID: 1420 Comm: taskset Tainted: G W 4.4.8+ #98 task: ffffffc06a5c4880 ti: ffffffc06e124000 task.ti: ffffffc06e124000 PC is at guarantee_online_cpus+0x2c/0x58 LR is at cpuset_cpus_allowed+0x4c/0x6c <snip> Process taskset (pid: 1420, stack limit = 0xffffffc06e124020) Call trace: [<ffffffc0001389b0>] guarantee_online_cpus+0x2c/0x58 [<ffffffc00013b208>] cpuset_cpus_allowed+0x4c/0x6c [<ffffffc0000d61f0>] sched_setaffinity+0xc0/0x1ac [<ffffffc0000d6374>] SyS_sched_setaffinity+0x98/0xac [<ffffffc000085cb0>] el0_svc_naked+0x24/0x28 The top cpuset's effective_cpus are guaranteed to be identical to cpu_online_mask eventually. Hence fall back to cpu_online_mask when there is no intersection between top cpuset's effective_cpus and cpu_online_mask. Signed-off-by: Joonwoo Park <joonwoop@codeaurora.org> Acked-by: Li Zefan <lizefan@huawei.com> Cc: Tejun Heo <tj@kernel.org> Cc: cgroups@vger.kernel.org Cc: linux-kernel@vger.kernel.org Cc: <stable@vger.kernel.org> # 3.17+ Signed-off-by: Tejun Heo <tj@kernel.org>
Diffstat (limited to 'Documentation')