/*
 * Copyright(C) 2015 Linaro Limited. All rights reserved.
 * Author: Mathieu Poirier <mathieu.poirier@linaro.org>
 *
 * 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.
 *
 * This program is distributed in the hope that it will be useful, but WITHOUT
 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
 * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
 * more details.
 *
 * You should have received a copy of the GNU General Public License along with
 * this program.  If not, see <http://www.gnu.org/licenses/>.
 */

#include <stdbool.h>
#include <linux/coresight-pmu.h>

#include "../../util/auxtrace.h"
#include "../../util/evlist.h"
#include "../../util/pmu.h"
#include "cs-etm.h"

struct auxtrace_record
*auxtrace_record__init(struct perf_evlist *evlist, int *err)
{
	struct perf_pmu	*cs_etm_pmu;
	struct perf_evsel *evsel;
	bool found_etm = false;

	cs_etm_pmu = perf_pmu__find(CORESIGHT_ETM_PMU_NAME);

	if (evlist) {
		evlist__for_each_entry(evlist, evsel) {
			if (cs_etm_pmu &&
			    evsel->attr.type == cs_etm_pmu->type)
				found_etm = true;
		}
	}

	if (found_etm)
		return cs_etm_record_init(err);

	/*
	 * Clear 'err' even if we haven't found a cs_etm event - that way perf
	 * record can still be used even if tracers aren't present.  The NULL
	 * return value will take care of telling the infrastructure HW tracing
	 * isn't available.
	 */
	*err = 0;
	return NULL;
}
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/security?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8'>security</a>/<a href='/cgit.cgi/linux/net-next.git/commit/security/integrity?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8'>integrity</a>/<a href='/cgit.cgi/linux/net-next.git/commit/security/integrity/evm?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8'>evm</a>/<a href='/cgit.cgi/linux/net-next.git/commit/security/integrity/evm/evm_main.c?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8'>evm_main.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='d2b3964a0780d2d2994eba57f950d6c9fe489ed8'/><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>Christoph Hellwig &lt;hch@lst.de&gt;</td><td class='right'>2017-01-20 09:31:54 -0800</td></tr>
<tr><th>committer</th><td>Darrick J. Wong &lt;darrick.wong@oracle.com&gt;</td><td class='right'>2017-01-23 10:55:07 -0800</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/security/integrity/evm/evm_main.c?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8'>d2b3964a0780d2d2994eba57f950d6c9fe489ed8</a> (<a href='/cgit.cgi/linux/net-next.git/patch/security/integrity/evm/evm_main.c?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8'>e5431a683b41059abd0032aa46685ae78d766a50</a> /<a href='/cgit.cgi/linux/net-next.git/tree/security/integrity/evm/evm_main.c?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8'>security/integrity/evm/evm_main.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/security/integrity/evm/evm_main.c?id=7a308bb3016f57e5be11a677d15b821536419d36'>7a308bb3016f57e5be11a677d15b821536419d36</a> (<a href='/cgit.cgi/linux/net-next.git/diff/security/integrity/evm/evm_main.c?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8&amp;id2=7a308bb3016f57e5be11a677d15b821536419d36'>diff</a>)</td></tr></table>
<div class='commit-subject'>xfs: fix COW writeback race</div><div class='commit-msg'>Due to the way how xfs_iomap_write_allocate tries to convert the whole
found extents from delalloc to real space we can run into a race
condition with multiple threads doing writes to this same extent.
For the non-COW case that is harmless as the only thing that can happen
is that we call xfs_bmapi_write on an extent that has already been
converted to a real allocation.  For COW writes where we move the extent
from the COW to the data fork after I/O completion the race is, however,
not quite as harmless.  In the worst case we are now calling
xfs_bmapi_write on a region that contains hole in the COW work, which
will trip up an assert in debug builds or lead to file system corruption
in non-debug builds.  This seems to be reproducible with workloads of
small O_DSYNC write, although so far I've not managed to come up with
a with an isolated reproducer.

The fix for the issue is relatively simple:  tell xfs_bmapi_write
that we are only asked to convert delayed allocations and skip holes
in that case.

Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
Reviewed-by: Brian Foster &lt;bfoster@redhat.com&gt;
Reviewed-by: Darrick J. Wong &lt;darrick.wong@oracle.com&gt;
Signed-off-by: Darrick J. Wong &lt;darrick.wong@oracle.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=d2b3964a0780d2d2994eba57f950d6c9fe489ed8'>Diffstat</a> (limited to 'security/integrity/evm/evm_main.c')</div><table summary='diffstat' class='diffstat'>