#ifndef _PERF_SYS_H
#define _PERF_SYS_H

#include <unistd.h>
#include <sys/types.h>
#include <sys/syscall.h>
#include <linux/types.h>
#include <linux/compiler.h>
#include <linux/perf_event.h>
#include <asm/barrier.h>

#if defined(__i386__)
#define cpu_relax()	asm volatile("rep; nop" ::: "memory");
#define CPUINFO_PROC	{"model name"}
#endif

#if defined(__x86_64__)
#define cpu_relax()	asm volatile("rep; nop" ::: "memory");
#define CPUINFO_PROC	{"model name"}
#endif

#ifdef __powerpc__
#define CPUINFO_PROC	{"cpu"}
#endif

#ifdef __s390__
#define CPUINFO_PROC	{"vendor_id"}
#endif

#ifdef __sh__
#define CPUINFO_PROC	{"cpu type"}
#endif

#ifdef __hppa__
#define CPUINFO_PROC	{"cpu"}
#endif

#ifdef __sparc__
#define CPUINFO_PROC	{"cpu"}
#endif

#ifdef __alpha__
#define CPUINFO_PROC	{"cpu model"}
#endif

#ifdef __ia64__
#define cpu_relax()	asm volatile ("hint @pause" ::: "memory")
#define CPUINFO_PROC	{"model name"}
#endif

#ifdef __arm__
#define CPUINFO_PROC	{"model name", "Processor"}
#endif

#ifdef __aarch64__
#define cpu_relax()	asm volatile("yield" ::: "memory")
#endif

#ifdef __mips__
#define CPUINFO_PROC	{"cpu model"}
#endif

#ifdef __arc__
#define CPUINFO_PROC	{"Processor"}
#endif

#ifdef __metag__
#define CPUINFO_PROC	{"CPU"}
#endif

#ifdef __xtensa__
#define CPUINFO_PROC	{"core ID"}
#endif

#ifdef __tile__
#define cpu_relax()	asm volatile ("mfspr zero, PASS" ::: "memory")
#define CPUINFO_PROC    {"model name"}
#endif

#ifndef cpu_relax
#define cpu_relax() barrier()
#endif

static inline int
sys_perf_event_open(struct perf_event_attr *attr,
		      pid_t pid, int cpu, int group_fd,
		      unsigned long flags)
{
	int fd;

	fd = syscall(__NR_perf_event_open, attr, pid, cpu,
		     group_fd, flags);

#ifdef HAVE_ATTR_TEST
	if (unlikely(test_attr__enabled))
		test_attr__open(attr, pid, cpu, fd, group_fd, flags);
#endif
	return fd;
}

#endif /* _PERF_SYS_H */
f656'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/?id=1a34439e5a0b2235e43f96816dbb15ee1154f656'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/'>
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<div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='1a34439e5a0b2235e43f96816dbb15ee1154f656'/><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>Paul Mackerras &lt;paulus@ozlabs.org&gt;</td><td class='right'>2016-10-11 22:25:47 +1100</td></tr>
<tr><th>committer</th><td>Michael Ellerman &lt;mpe@ellerman.id.au&gt;</td><td class='right'>2016-10-12 08:31:37 +1100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=1a34439e5a0b2235e43f96816dbb15ee1154f656'>1a34439e5a0b2235e43f96816dbb15ee1154f656</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=1a34439e5a0b2235e43f96816dbb15ee1154f656'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=1a34439e5a0b2235e43f96816dbb15ee1154f656'>e430a9a021fcfc1a9459cb3e87e5946e3ef01eee</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=7c8cb4b50f3cc6f4a8f7bfddad6fb5a845df3261'>7c8cb4b50f3cc6f4a8f7bfddad6fb5a845df3261</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=1a34439e5a0b2235e43f96816dbb15ee1154f656&amp;id2=7c8cb4b50f3cc6f4a8f7bfddad6fb5a845df3261'>diff</a>)</td></tr></table>
<div class='commit-subject'>powerpc/64: Fix incorrect return value from __copy_tofrom_user</div><div class='commit-msg'>Debugging a data corruption issue with virtio-net/vhost-net led to
the observation that __copy_tofrom_user was occasionally returning
a value 16 larger than it should.  Since the return value from
__copy_tofrom_user is the number of bytes not copied, this means
that __copy_tofrom_user can occasionally return a value larger
than the number of bytes it was asked to copy.  In turn this can
cause higher-level copy functions such as copy_page_to_iter_iovec
to corrupt memory by copying data into the wrong memory locations.

It turns out that the failing case involves a fault on the store
at label 79, and at that point the first unmodified byte of the
destination is at R3 + 16.  Consequently the exception handler
for that store needs to add 16 to R3 before using it to work out
how many bytes were not copied, but in this one case it was not
adding the offset to R3.  To fix it, this moves the label 179 to
the point where we add 16 to R3.  I have checked manually all the
exception handlers for the loads and stores in this code and the
rest of them are correct (it would be excellent to have an
automated test of all the exception cases).

This bug has been present since this code was initially
committed in May 2002 to Linux version 2.5.20.

Cc: stable@vger.kernel.org
Signed-off-by: Paul Mackerras &lt;paulus@ozlabs.org&gt;
Signed-off-by: Michael Ellerman &lt;mpe@ellerman.id.au&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=1a34439e5a0b2235e43f96816dbb15ee1154f656'>Diffstat</a></div><table summary='diffstat' class='diffstat'>