#ifndef ARCH_PERF_REGS_H
#define ARCH_PERF_REGS_H

#include <stdlib.h>
#include <linux/types.h>
#include <asm/perf_regs.h>

void perf_regs_load(u64 *regs);

#define PERF_REGS_MASK	((1ULL << PERF_REG_ARM64_MAX) - 1)
#define PERF_REGS_MAX	PERF_REG_ARM64_MAX
#define PERF_SAMPLE_REGS_ABI	PERF_SAMPLE_REGS_ABI_64

#define PERF_REG_IP	PERF_REG_ARM64_PC
#define PERF_REG_SP	PERF_REG_ARM64_SP

static inline const char *perf_reg_name(int id)
{
	switch (id) {
	case PERF_REG_ARM64_X0:
		return "x0";
	case PERF_REG_ARM64_X1:
		return "x1";
	case PERF_REG_ARM64_X2:
		return "x2";
	case PERF_REG_ARM64_X3:
		return "x3";
	case PERF_REG_ARM64_X4:
		return "x4";
	case PERF_REG_ARM64_X5:
		return "x5";
	case PERF_REG_ARM64_X6:
		return "x6";
	case PERF_REG_ARM64_X7:
		return "x7";
	case PERF_REG_ARM64_X8:
		return "x8";
	case PERF_REG_ARM64_X9:
		return "x9";
	case PERF_REG_ARM64_X10:
		return "x10";
	case PERF_REG_ARM64_X11:
		return "x11";
	case PERF_REG_ARM64_X12:
		return "x12";
	case PERF_REG_ARM64_X13:
		return "x13";
	case PERF_REG_ARM64_X14:
		return "x14";
	case PERF_REG_ARM64_X15:
		return "x15";
	case PERF_REG_ARM64_X16:
		return "x16";
	case PERF_REG_ARM64_X17:
		return "x17";
	case PERF_REG_ARM64_X18:
		return "x18";
	case PERF_REG_ARM64_X19:
		return "x19";
	case PERF_REG_ARM64_X20:
		return "x20";
	case PERF_REG_ARM64_X21:
		return "x21";
	case PERF_REG_ARM64_X22:
		return "x22";
	case PERF_REG_ARM64_X23:
		return "x23";
	case PERF_REG_ARM64_X24:
		return "x24";
	case PERF_REG_ARM64_X25:
		return "x25";
	case PERF_REG_ARM64_X26:
		return "x26";
	case PERF_REG_ARM64_X27:
		return "x27";
	case PERF_REG_ARM64_X28:
		return "x28";
	case PERF_REG_ARM64_X29:
		return "x29";
	case PERF_REG_ARM64_SP:
		return "sp";
	case PERF_REG_ARM64_LR:
		return "lr";
	case PERF_REG_ARM64_PC:
		return "pc";
	default:
		return NULL;
	}

	return NULL;
}

#endif /* ARCH_PERF_REGS_H */
ls/hv/hv_fcopy_daemon.c?id=e3426e12fee11cb7949b65428955127ca3dcb433'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/tools/hv/hv_fcopy_daemon.c?id=e3426e12fee11cb7949b65428955127ca3dcb433'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/tools/hv/hv_fcopy_daemon.c'>
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414e54bf1a'>pmu-events</a>/<a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/pmu-events/jsmn.c?h=nds-private-remove&amp;id=91539eb1fda2d530d3b268eef542c5414e54bf1a'>jsmn.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='91539eb1fda2d530d3b268eef542c5414e54bf1a'/><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>Iago Abal &lt;mail@iagoabal.eu&gt;</td><td class='right'>2017-01-11 14:00:21 +0100</td></tr>
<tr><th>committer</th><td>Vinod Koul &lt;vinod.koul@intel.com&gt;</td><td class='right'>2017-01-25 15:35:11 +0530</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/pmu-events/jsmn.c?h=nds-private-remove&amp;id=91539eb1fda2d530d3b268eef542c5414e54bf1a'>91539eb1fda2d530d3b268eef542c5414e54bf1a</a> (<a href='/cgit.cgi/linux/net-next.git/patch/tools/perf/pmu-events/jsmn.c?id=91539eb1fda2d530d3b268eef542c5414e54bf1a'>patch</a>)</td></tr>
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<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/tools/perf/pmu-events/jsmn.c?h=nds-private-remove&amp;id=6610d0edf6dc7ee97e46ab3a538a565c79d26199'>6610d0edf6dc7ee97e46ab3a538a565c79d26199</a> (<a href='/cgit.cgi/linux/net-next.git/diff/tools/perf/pmu-events/jsmn.c?h=nds-private-remove&amp;id=91539eb1fda2d530d3b268eef542c5414e54bf1a&amp;id2=6610d0edf6dc7ee97e46ab3a538a565c79d26199'>diff</a>)</td></tr></table>
<div class='commit-subject'>dmaengine: pl330: fix double lock</div><div class='commit-msg'>The static bug finder EBA (http://www.iagoabal.eu/eba/) reported the
following double-lock bug:

    Double lock:
    1. spin_lock_irqsave(pch-&gt;lock, flags) at pl330_free_chan_resources:2236;
    2. call to function `pl330_release_channel' immediately after;
    3. call to function `dma_pl330_rqcb' in line 1753;
    4. spin_lock_irqsave(pch-&gt;lock, flags) at dma_pl330_rqcb:1505.

I have fixed it as suggested by Marek Szyprowski.

First, I have replaced `pch-&gt;lock' with `pl330-&gt;lock' in functions
`pl330_alloc_chan_resources' and `pl330_free_chan_resources'. This avoids
the double-lock by acquiring a different lock than `dma_pl330_rqcb'.

NOTE that, as a result, `pl330_free_chan_resources' executes
`list_splice_tail_init' on `pch-&gt;work_list' under lock `pl330-&gt;lock',
whereas in the rest of the code `pch-&gt;work_list' is protected by
`pch-&gt;lock'. I don't know if this may cause race conditions. Similarly
`pch-&gt;cyclic' is written by `pl330_alloc_chan_resources' under
`pl330-&gt;lock' but read by `pl330_tx_submit' under `pch-&gt;lock'.

Second, I have removed locking from `pl330_request_channel' and
`pl330_release_channel' functions. Function `pl330_request_channel' is
only called from `pl330_alloc_chan_resources', so the lock is already
held. Function `pl330_release_channel' is called from
`pl330_free_chan_resources', which already holds the lock, and from
`pl330_del'. Function `pl330_del' is called in an error path of
`pl330_probe' and at the end of `pl330_remove', but I assume that there
cannot be concurrent accesses to the protected data at those points.

Signed-off-by: Iago Abal &lt;mail@iagoabal.eu&gt;
Reviewed-by: Marek Szyprowski &lt;m.szyprowski@samsung.com&gt;
Signed-off-by: Vinod Koul &lt;vinod.koul@intel.com&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=91539eb1fda2d530d3b268eef542c5414e54bf1a'>Diffstat</a> (limited to 'tools/perf/pmu-events/jsmn.c')</div><table summary='diffstat' class='diffstat'>