/*
 * ldt_gdt.c - Test cases for LDT and GDT access
 * Copyright (c) 2011-2015 Andrew Lutomirski
 */

#define _GNU_SOURCE

#include <stdio.h>
#include <sys/time.h>
#include <time.h>
#include <stdlib.h>
#include <unistd.h>
#include <sys/syscall.h>
#include <dlfcn.h>
#include <string.h>
#include <errno.h>
#include <sched.h>
#include <stdbool.h>

#ifndef SYS_getcpu
# ifdef __x86_64__
#  define SYS_getcpu 309
# else
#  define SYS_getcpu 318
# endif
#endif

int nerrs = 0;

#ifdef __x86_64__
# define VSYS(x) (x)
#else
# define VSYS(x) 0
#endif

typedef long (*getcpu_t)(unsigned *, unsigned *, void *);

const getcpu_t vgetcpu = (getcpu_t)VSYS(0xffffffffff600800);
getcpu_t vdso_getcpu;

void fill_function_pointers()
{
	void *vdso = dlopen("linux-vdso.so.1",
			    RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
	if (!vdso)
		vdso = dlopen("linux-gate.so.1",
			      RTLD_LAZY | RTLD_LOCAL | RTLD_NOLOAD);
	if (!vdso) {
		printf("[WARN]\tfailed to find vDSO\n");
		return;
	}

	vdso_getcpu = (getcpu_t)dlsym(vdso, "__vdso_getcpu");
	if (!vdso_getcpu)
		printf("Warning: failed to find getcpu in vDSO\n");
}

static long sys_getcpu(unsigned * cpu, unsigned * node,
		       void* cache)
{
	return syscall(__NR_getcpu, cpu, node, cache);
}

static void test_getcpu(void)
{
	printf("[RUN]\tTesting getcpu...\n");

	for (int cpu = 0; ; cpu++) {
		cpu_set_t cpuset;
		CPU_ZERO(&cpuset);
		CPU_SET(cpu, &cpuset);
		if (sched_setaffinity(0, sizeof(cpuset), &cpuset) != 0)
			return;

		unsigned cpu_sys, cpu_vdso, cpu_vsys,
			node_sys, node_vdso, node_vsys;
		long ret_sys, ret_vdso = 1, ret_vsys = 1;
		unsigned node;

		ret_sys = sys_getcpu(&cpu_sys, &node_sys, 0);
		if (vdso_getcpu)
			ret_vdso = vdso_getcpu(&cpu_vdso, &node_vdso, 0);
		if (vgetcpu)
			ret_vsys = vgetcpu(&cpu_vsys, &node_vsys, 0);

		if (!ret_sys)
			node = node_sys;
		else if (!ret_vdso)
			node = node_vdso;
		else if (!ret_vsys)
			node = node_vsys;

		bool ok = true;
		if (!ret_sys && (cpu_sys != cpu || node_sys != node))
			ok = false;
		if (!ret_vdso && (cpu_vdso != cpu || node_vdso != node))
			ok = false;
		if (!ret_vsys && (cpu_vsys != cpu || node_vsys != node))
			ok = false;

		printf("[%s]\tCPU %u:", ok ? "OK" : "FAIL", cpu);
		if (!ret_sys)
			printf(" syscall: cpu %u, node %u", cpu_sys, node_sys);
		if (!ret_vdso)
			printf(" vdso: cpu %u, node %u", cpu_vdso, node_vdso);
		if (!ret_vsys)
			printf(" vsyscall: cpu %u, node %u", cpu_vsys,
			       node_vsys);
		printf("\n");

		if (!ok)
			nerrs++;
	}
}

int main(int argc, char **argv)
{
	fill_function_pointers();

	test_getcpu();

	return nerrs ? 1 : 0;
}
/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>include</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/soc?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>soc</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/soc/tegra?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>tegra</a>/<a href='/cgit.cgi/linux/net-next.git/commit/include/soc/tegra/emc.h?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>emc.h</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='dfef358bd1beb4e7b5c94eca944be9cd23dfc752'/><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'>2017-01-30 13:15:41 +0100</td></tr>
<tr><th>committer</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-02-02 10:35:46 -0600</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/soc/tegra/emc.h?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>dfef358bd1beb4e7b5c94eca944be9cd23dfc752</a> (<a href='/cgit.cgi/linux/net-next.git/patch/include/soc/tegra/emc.h?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>b9a2afb38a4c2ac8ad31f49ec0d71fe9e5b1994c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/soc/tegra/emc.h?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>include/soc/tegra/emc.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/soc/tegra/emc.h?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>030305d69fc6963c16003f50d7e8d74b02d0a143</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/soc/tegra/emc.h?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752&amp;id2=030305d69fc6963c16003f50d7e8d74b02d0a143'>diff</a>)</td></tr></table>
<div class='commit-subject'>PCI/MSI: Don't apply affinity if there aren't enough vectors left</div><div class='commit-msg'>Bart reported a problem wіth an out of bounds access in the low-level IRQ
affinity code, which we root caused to the qla2xxx driver assigning all its
MSI-X vectors to the pre and post vectors, and not having any left for the
actually spread IRQs.

Fix this issue by not asking for affinity assignment when there are no
vectors to assign left.

Fixes: 402723ad5c62 ("PCI/MSI: Provide pci_alloc_irq_vectors_affinity()")
Link: https://lkml.kernel.org/r/1485359225.3093.3.camel@sandisk.com
Reported-by: Bart Van Assche &lt;bart.vanassche@sandisk.com&gt;
Tested-by: Bart Van Assche &lt;bart.vanassche@sandisk.com&gt;
Signed-off-by: Christoph Hellwig &lt;hch@lst.de&gt;
Signed-off-by: Bjorn Helgaas &lt;bhelgaas@google.com&gt;</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=dfef358bd1beb4e7b5c94eca944be9cd23dfc752'>Diffstat</a> (limited to 'include/soc/tegra/emc.h')</div><table summary='diffstat' class='diffstat'>