/*
 *  (C) 2004 Bruno Ducrot <ducrot@poupinou.org>
 *
 *  Licensed under the terms of the GNU GPL License version 2.
 *
 * Based on code found in
 * linux/arch/i386/kernel/cpu/cpufreq/powernow-k8.c
 * and originally developed by Paul Devriendt
 */

#include <stdio.h>
#include <stdlib.h>
#include <stdint.h>
#include <unistd.h>
#include <errno.h>
#include <fcntl.h>

#include <sys/types.h>
#include <sys/stat.h>

#define MCPU 32

#define MSR_FIDVID_STATUS	0xc0010042

#define MSR_S_HI_CURRENT_VID	0x0000001f
#define MSR_S_LO_CURRENT_FID	0x0000003f

static int get_fidvid(uint32_t cpu, uint32_t *fid, uint32_t *vid)
{
	int err = 1;
	uint64_t msr = 0;
	int fd;
	char file[20];

	if (cpu > MCPU)
		goto out;

	sprintf(file, "/dev/cpu/%d/msr", cpu);

	fd = open(file, O_RDONLY);
	if (fd < 0)
		goto out;
	lseek(fd, MSR_FIDVID_STATUS, SEEK_CUR);
	if (read(fd, &msr, 8) != 8)
		goto err1;

	*fid = ((uint32_t )(msr & 0xffffffffull)) & MSR_S_LO_CURRENT_FID;
	*vid = ((uint32_t )(msr>>32 & 0xffffffffull)) & MSR_S_HI_CURRENT_VID;
	err = 0;
err1:
	close(fd);
out:
	return err;
}


/* Return a frequency in MHz, given an input fid */
static uint32_t find_freq_from_fid(uint32_t fid)
{
	return 800 + (fid * 100);
}

/* Return a voltage in miliVolts, given an input vid */
static uint32_t find_millivolts_from_vid(uint32_t vid)
{
	return 1550-vid*25;
}

int main (int argc, char *argv[])
{
	int err;
	int cpu;
	uint32_t fid, vid;

	if (argc < 2)
		cpu = 0;
	else
		cpu = strtoul(argv[1], NULL, 0);

	err = get_fidvid(cpu, &fid, &vid);

	if (err) {
		printf("can't get fid, vid from MSR\n");
		printf("Possible trouble: you don't run a powernow-k8 capable cpu\n");
		printf("or you are not root, or the msr driver is not present\n");
		exit(1);
	}

	
	printf("cpu %d currently at %d MHz and %d mV\n",
			cpu,
			find_freq_from_fid(fid),
			find_millivolts_from_vid(vid));
	
	return 0;
}
'>tree</a><a class='active' href='/cgit.cgi/linux/net-next.git/commit/net/batman-adv/multicast.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/net/batman-adv/multicast.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/net/batman-adv/multicast.c'>
<input type='hidden' name='id' value='07cd12945551b63ecb1a349d50a6d69d1d6feb4a'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/batman-adv?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>batman-adv</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/batman-adv/multicast.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>multicast.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='07cd12945551b63ecb1a349d50a6d69d1d6feb4a'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Tejun Heo &lt;tj@kernel.org&gt;</td><td class='right'>2017-01-26 16:47:28 -0500</td></tr>
<tr><th>committer</th><td>Tejun Heo &lt;tj@kernel.org&gt;</td><td class='right'>2017-01-26 16:47:28 -0500</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/batman-adv/multicast.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>07cd12945551b63ecb1a349d50a6d69d1d6feb4a</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/batman-adv/multicast.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>75f65eba7eac9277971082a2d5a4cf1370562c0c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/batman-adv/multicast.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>net/batman-adv/multicast.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/batman-adv/multicast.c?id=7ce7d89f48834cefece7804d38fc5d85382edf77'>7ce7d89f48834cefece7804d38fc5d85382edf77</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/batman-adv/multicast.c?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a&amp;id2=7ce7d89f48834cefece7804d38fc5d85382edf77'>diff</a>)</td></tr></table>
<div class='commit-subject'>cgroup: don't online subsystems before cgroup_name/path() are operational</div><div class='commit-msg'>While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out
cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems
before the new cgroup is associated with it kernfs_node.  This is fine
for cgroup proper but cgroup_name/path() depend on the associated
kernfs_node and if a subsystem makes the new cgroup_subsys_state
visible, which they're allowed to after onlining, it can lead to NULL
dereference.

The current code performs cgroup creation and subsystem onlining in
cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems
visible afterwards.  There's no reason to online the subsystems early
and we can simply drop cgroup_apply_control_enable() call from
cgroup_create() so that the subsystems are onlined and made visible at
the same time.

Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
Reported-by: Konstantin Khlebnikov &lt;khlebnikov@yandex-team.ru&gt;
Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") 
Cc: stable@vger.kernel.org # v4.6+
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>Diffstat</a> (limited to 'net/batman-adv/multicast.c')</div><table summary='diffstat' class='diffstat'>