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Revision 4de8ebeff8ddefaceeb7fc6a9b1a514fc9624509 authored by Linus Torvalds on 22 February 2016, 22:09:18 UTC, committed by Linus Torvalds on 22 February 2016, 22:09:18 UTC 
Merge tag 'trace-fixes-v4.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace
 
Pull tracing fixes from Steven Rostedt:
 "Two more small fixes.

  One is by Yang Shi who added a READ_ONCE_NOCHECK() to the scan of the
  stack made by the stack tracer.  As the stack tracer scans the entire
  kernel stack, KASAN triggers seeing it as a "stack out of bounds"
  error.  As the scan is looking at the contents of the stack from
  parent functions.  The NOCHECK() tells KASAN that this is done on
  purpose, and is not some kind of stack overflow.

  The second fix is to the ftrace selftests, to retrieve the PID of
  executed commands from the shell with '$!' and not by parsing 'jobs'"

* tag 'trace-fixes-v4.5-rc5' of git://git.kernel.org/pub/scm/linux/kernel/git/rostedt/linux-trace:
  tracing, kasan: Silence Kasan warning in check_stack of stack_tracer
  ftracetest: Fix instance test to use proper shell command for pids
2 parent s 692b8c6 + 6e22c83
Raw File
xt_cpu.c 
/* Kernel module to match running CPU */

/*
 * Might be used to distribute connections on several daemons, if
 * RPS (Remote Packet Steering) is enabled or NIC is multiqueue capable,
 * each RX queue IRQ affined to one CPU (1:1 mapping)
 *
 */

/* (C) 2010 Eric Dumazet
 *
 * This program is free software; you can redistribute it and/or modify
 * it under the terms of the GNU General Public License version 2 as
 * published by the Free Software Foundation.
 */

#include <linux/module.h>
#include <linux/skbuff.h>
#include <linux/netfilter/xt_cpu.h>
#include <linux/netfilter/x_tables.h>

MODULE_LICENSE("GPL");
MODULE_AUTHOR("Eric Dumazet <eric.dumazet@gmail.com>");
MODULE_DESCRIPTION("Xtables: CPU match");
MODULE_ALIAS("ipt_cpu");
MODULE_ALIAS("ip6t_cpu");

static int cpu_mt_check(const struct xt_mtchk_param *par)
{
	const struct xt_cpu_info *info = par->matchinfo;

	if (info->invert & ~1)
		return -EINVAL;
	return 0;
}

static bool cpu_mt(const struct sk_buff *skb, struct xt_action_param *par)
{
	const struct xt_cpu_info *info = par->matchinfo;

	return (info->cpu == smp_processor_id()) ^ info->invert;
}

static struct xt_match cpu_mt_reg __read_mostly = {
	.name       = "cpu",
	.revision   = 0,
	.family     = NFPROTO_UNSPEC,
	.checkentry = cpu_mt_check,
	.match      = cpu_mt,
	.matchsize  = sizeof(struct xt_cpu_info),
	.me         = THIS_MODULE,
};

static int __init cpu_mt_init(void)
{
	return xt_register_match(&cpu_mt_reg);
}

static void __exit cpu_mt_exit(void)
{
	xt_unregister_match(&cpu_mt_reg);
}

module_init(cpu_mt_init);
module_exit(cpu_mt_exit);
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