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62 |
marcus.erl |
/*
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* drivers/s390/s390mach.c
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* S/390 machine check handler
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| 4 |
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*
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* S390 version
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* Copyright (C) 2000 IBM Deutschland Entwicklung GmbH, IBM Corporation
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* Author(s): Ingo Adlung (adlung@de.ibm.com)
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* Martin Schwidefsky (schwidefsky@de.ibm.com)
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*/
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#include <linux/init.h>
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#include <linux/sched.h>
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#include <linux/errno.h>
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#include <linux/workqueue.h>
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#include <linux/time.h>
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#include <linux/device.h>
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#include <linux/kthread.h>
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#include <asm/etr.h>
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#include <asm/lowcore.h>
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#include <asm/cio.h>
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#include "cio/cio.h"
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#include "cio/chsc.h"
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#include "cio/css.h"
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#include "cio/chp.h"
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#include "s390mach.h"
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static struct semaphore m_sem;
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| 29 |
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static NORET_TYPE void
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s390_handle_damage(char *msg)
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{
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| 32 |
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#ifdef CONFIG_SMP
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smp_send_stop();
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#endif
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disabled_wait((unsigned long) __builtin_return_address(0));
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for(;;);
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}
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/*
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* Retrieve CRWs and call function to handle event.
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*
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* Note : we currently process CRWs for io and chsc subchannels only
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*/
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static int
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s390_collect_crw_info(void *param)
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{
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| 47 |
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struct crw crw[2];
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int ccode;
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struct semaphore *sem;
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unsigned int chain;
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sem = (struct semaphore *)param;
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repeat:
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down_interruptible(sem);
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chain = 0;
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| 56 |
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while (1) {
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if (unlikely(chain > 1)) {
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struct crw tmp_crw;
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| 60 |
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printk(KERN_WARNING"%s: Code does not support more "
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"than two chained crws; please report to "
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"linux390@de.ibm.com!\n", __FUNCTION__);
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ccode = stcrw(&tmp_crw);
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printk(KERN_WARNING"%s: crw reports slct=%d, oflw=%d, "
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"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
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__FUNCTION__, tmp_crw.slct, tmp_crw.oflw,
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tmp_crw.chn, tmp_crw.rsc, tmp_crw.anc,
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tmp_crw.erc, tmp_crw.rsid);
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printk(KERN_WARNING"%s: This was crw number %x in the "
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"chain\n", __FUNCTION__, chain);
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if (ccode != 0)
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break;
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chain = tmp_crw.chn ? chain + 1 : 0;
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continue;
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}
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ccode = stcrw(&crw[chain]);
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if (ccode != 0)
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break;
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printk(KERN_DEBUG "crw_info : CRW reports slct=%d, oflw=%d, "
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"chn=%d, rsc=%X, anc=%d, erc=%X, rsid=%X\n",
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crw[chain].slct, crw[chain].oflw, crw[chain].chn,
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crw[chain].rsc, crw[chain].anc, crw[chain].erc,
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crw[chain].rsid);
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/* Check for overflows. */
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if (crw[chain].oflw) {
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pr_debug("%s: crw overflow detected!\n", __FUNCTION__);
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css_schedule_eval_all();
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chain = 0;
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continue;
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| 90 |
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}
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switch (crw[chain].rsc) {
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case CRW_RSC_SCH:
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if (crw[0].chn && !chain)
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break;
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pr_debug("source is subchannel %04X\n", crw[0].rsid);
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css_process_crw(crw[0].rsid, chain ? crw[1].rsid : 0);
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break;
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case CRW_RSC_MONITOR:
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pr_debug("source is monitoring facility\n");
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break;
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case CRW_RSC_CPATH:
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pr_debug("source is channel path %02X\n", crw[0].rsid);
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/*
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* Check for solicited machine checks. These are
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* created by reset channel path and need not be
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* reported to the common I/O layer.
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*/
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if (crw[chain].slct) {
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pr_debug("solicited machine check for "
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"channel path %02X\n", crw[0].rsid);
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break;
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}
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switch (crw[0].erc) {
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case CRW_ERC_IPARM: /* Path has come. */
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chp_process_crw(crw[0].rsid, 1);
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break;
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case CRW_ERC_PERRI: /* Path has gone. */
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case CRW_ERC_PERRN:
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chp_process_crw(crw[0].rsid, 0);
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break;
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default:
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pr_debug("Don't know how to handle erc=%x\n",
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crw[0].erc);
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}
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break;
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case CRW_RSC_CONFIG:
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pr_debug("source is configuration-alert facility\n");
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break;
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case CRW_RSC_CSS:
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pr_debug("source is channel subsystem\n");
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chsc_process_crw();
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break;
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default:
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pr_debug("unknown source\n");
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break;
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}
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/* chain is always 0 or 1 here. */
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chain = crw[chain].chn ? chain + 1 : 0;
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}
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goto repeat;
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| 141 |
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return 0;
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| 142 |
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}
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| 144 |
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struct mcck_struct {
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int kill_task;
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int channel_report;
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int warning;
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| 148 |
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unsigned long long mcck_code;
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};
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static DEFINE_PER_CPU(struct mcck_struct, cpu_mcck);
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| 153 |
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/*
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* Main machine check handler function. Will be called with interrupts enabled
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* or disabled and machine checks enabled or disabled.
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*/
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void
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s390_handle_mcck(void)
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{
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unsigned long flags;
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struct mcck_struct mcck;
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| 162 |
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| 163 |
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/*
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* Disable machine checks and get the current state of accumulated
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* machine checks. Afterwards delete the old state and enable machine
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* checks again.
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*/
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local_irq_save(flags);
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local_mcck_disable();
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mcck = __get_cpu_var(cpu_mcck);
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memset(&__get_cpu_var(cpu_mcck), 0, sizeof(struct mcck_struct));
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clear_thread_flag(TIF_MCCK_PENDING);
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local_mcck_enable();
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local_irq_restore(flags);
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| 175 |
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| 176 |
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if (mcck.channel_report)
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up(&m_sem);
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| 179 |
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#ifdef CONFIG_MACHCHK_WARNING
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| 180 |
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/*
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| 181 |
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* The warning may remain for a prolonged period on the bare iron.
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* (actually till the machine is powered off, or until the problem is gone)
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* So we just stop listening for the WARNING MCH and prevent continuously
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* being interrupted. One caveat is however, that we must do this per
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* processor and cannot use the smp version of ctl_clear_bit().
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| 186 |
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* On VM we only get one interrupt per virtally presented machinecheck.
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* Though one suffices, we may get one interrupt per (virtual) processor.
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*/
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| 189 |
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if (mcck.warning) { /* WARNING pending ? */
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| 190 |
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static int mchchk_wng_posted = 0;
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| 191 |
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/*
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| 192 |
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* Use single machine clear, as we cannot handle smp right now
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| 193 |
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*/
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| 194 |
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__ctl_clear_bit(14, 24); /* Disable WARNING MCH */
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| 195 |
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if (xchg(&mchchk_wng_posted, 1) == 0)
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| 196 |
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kill_cad_pid(SIGPWR, 1);
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| 197 |
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}
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| 198 |
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#endif
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| 199 |
|
|
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| 200 |
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if (mcck.kill_task) {
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| 201 |
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local_irq_enable();
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| 202 |
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printk(KERN_EMERG "mcck: Terminating task because of machine "
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| 203 |
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"malfunction (code 0x%016llx).\n", mcck.mcck_code);
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| 204 |
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printk(KERN_EMERG "mcck: task: %s, pid: %d.\n",
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| 205 |
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current->comm, current->pid);
|
| 206 |
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do_exit(SIGSEGV);
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| 207 |
|
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}
|
| 208 |
|
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}
|
| 209 |
|
|
|
| 210 |
|
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/*
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| 211 |
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* returns 0 if all registers could be validated
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| 212 |
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* returns 1 otherwise
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| 213 |
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*/
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| 214 |
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static int
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| 215 |
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s390_revalidate_registers(struct mci *mci)
|
| 216 |
|
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{
|
| 217 |
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int kill_task;
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| 218 |
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u64 tmpclock;
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| 219 |
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u64 zero;
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| 220 |
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void *fpt_save_area, *fpt_creg_save_area;
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| 221 |
|
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| 222 |
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kill_task = 0;
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| 223 |
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zero = 0;
|
| 224 |
|
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/* General purpose registers */
|
| 225 |
|
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if (!mci->gr)
|
| 226 |
|
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/*
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| 227 |
|
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* General purpose registers couldn't be restored and have
|
| 228 |
|
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* unknown contents. Process needs to be terminated.
|
| 229 |
|
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*/
|
| 230 |
|
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kill_task = 1;
|
| 231 |
|
|
|
| 232 |
|
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/* Revalidate floating point registers */
|
| 233 |
|
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if (!mci->fp)
|
| 234 |
|
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/*
|
| 235 |
|
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* Floating point registers can't be restored and
|
| 236 |
|
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* therefore the process needs to be terminated.
|
| 237 |
|
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*/
|
| 238 |
|
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kill_task = 1;
|
| 239 |
|
|
|
| 240 |
|
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#ifndef CONFIG_64BIT
|
| 241 |
|
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asm volatile(
|
| 242 |
|
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" ld 0,0(%0)\n"
|
| 243 |
|
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" ld 2,8(%0)\n"
|
| 244 |
|
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" ld 4,16(%0)\n"
|
| 245 |
|
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" ld 6,24(%0)"
|
| 246 |
|
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: : "a" (&S390_lowcore.floating_pt_save_area));
|
| 247 |
|
|
#endif
|
| 248 |
|
|
|
| 249 |
|
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if (MACHINE_HAS_IEEE) {
|
| 250 |
|
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#ifdef CONFIG_64BIT
|
| 251 |
|
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fpt_save_area = &S390_lowcore.floating_pt_save_area;
|
| 252 |
|
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fpt_creg_save_area = &S390_lowcore.fpt_creg_save_area;
|
| 253 |
|
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#else
|
| 254 |
|
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fpt_save_area = (void *) S390_lowcore.extended_save_area_addr;
|
| 255 |
|
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fpt_creg_save_area = fpt_save_area+128;
|
| 256 |
|
|
#endif
|
| 257 |
|
|
/* Floating point control register */
|
| 258 |
|
|
if (!mci->fc) {
|
| 259 |
|
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/*
|
| 260 |
|
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* Floating point control register can't be restored.
|
| 261 |
|
|
* Task will be terminated.
|
| 262 |
|
|
*/
|
| 263 |
|
|
asm volatile("lfpc 0(%0)" : : "a" (&zero), "m" (zero));
|
| 264 |
|
|
kill_task = 1;
|
| 265 |
|
|
|
| 266 |
|
|
} else
|
| 267 |
|
|
asm volatile("lfpc 0(%0)" : : "a" (fpt_creg_save_area));
|
| 268 |
|
|
|
| 269 |
|
|
asm volatile(
|
| 270 |
|
|
" ld 0,0(%0)\n"
|
| 271 |
|
|
" ld 1,8(%0)\n"
|
| 272 |
|
|
" ld 2,16(%0)\n"
|
| 273 |
|
|
" ld 3,24(%0)\n"
|
| 274 |
|
|
" ld 4,32(%0)\n"
|
| 275 |
|
|
" ld 5,40(%0)\n"
|
| 276 |
|
|
" ld 6,48(%0)\n"
|
| 277 |
|
|
" ld 7,56(%0)\n"
|
| 278 |
|
|
" ld 8,64(%0)\n"
|
| 279 |
|
|
" ld 9,72(%0)\n"
|
| 280 |
|
|
" ld 10,80(%0)\n"
|
| 281 |
|
|
" ld 11,88(%0)\n"
|
| 282 |
|
|
" ld 12,96(%0)\n"
|
| 283 |
|
|
" ld 13,104(%0)\n"
|
| 284 |
|
|
" ld 14,112(%0)\n"
|
| 285 |
|
|
" ld 15,120(%0)\n"
|
| 286 |
|
|
: : "a" (fpt_save_area));
|
| 287 |
|
|
}
|
| 288 |
|
|
|
| 289 |
|
|
/* Revalidate access registers */
|
| 290 |
|
|
asm volatile(
|
| 291 |
|
|
" lam 0,15,0(%0)"
|
| 292 |
|
|
: : "a" (&S390_lowcore.access_regs_save_area));
|
| 293 |
|
|
if (!mci->ar)
|
| 294 |
|
|
/*
|
| 295 |
|
|
* Access registers have unknown contents.
|
| 296 |
|
|
* Terminating task.
|
| 297 |
|
|
*/
|
| 298 |
|
|
kill_task = 1;
|
| 299 |
|
|
|
| 300 |
|
|
/* Revalidate control registers */
|
| 301 |
|
|
if (!mci->cr)
|
| 302 |
|
|
/*
|
| 303 |
|
|
* Control registers have unknown contents.
|
| 304 |
|
|
* Can't recover and therefore stopping machine.
|
| 305 |
|
|
*/
|
| 306 |
|
|
s390_handle_damage("invalid control registers.");
|
| 307 |
|
|
else
|
| 308 |
|
|
#ifdef CONFIG_64BIT
|
| 309 |
|
|
asm volatile(
|
| 310 |
|
|
" lctlg 0,15,0(%0)"
|
| 311 |
|
|
: : "a" (&S390_lowcore.cregs_save_area));
|
| 312 |
|
|
#else
|
| 313 |
|
|
asm volatile(
|
| 314 |
|
|
" lctl 0,15,0(%0)"
|
| 315 |
|
|
: : "a" (&S390_lowcore.cregs_save_area));
|
| 316 |
|
|
#endif
|
| 317 |
|
|
|
| 318 |
|
|
/*
|
| 319 |
|
|
* We don't even try to revalidate the TOD register, since we simply
|
| 320 |
|
|
* can't write something sensible into that register.
|
| 321 |
|
|
*/
|
| 322 |
|
|
|
| 323 |
|
|
#ifdef CONFIG_64BIT
|
| 324 |
|
|
/*
|
| 325 |
|
|
* See if we can revalidate the TOD programmable register with its
|
| 326 |
|
|
* old contents (should be zero) otherwise set it to zero.
|
| 327 |
|
|
*/
|
| 328 |
|
|
if (!mci->pr)
|
| 329 |
|
|
asm volatile(
|
| 330 |
|
|
" sr 0,0\n"
|
| 331 |
|
|
" sckpf"
|
| 332 |
|
|
: : : "0", "cc");
|
| 333 |
|
|
else
|
| 334 |
|
|
asm volatile(
|
| 335 |
|
|
" l 0,0(%0)\n"
|
| 336 |
|
|
" sckpf"
|
| 337 |
|
|
: : "a" (&S390_lowcore.tod_progreg_save_area)
|
| 338 |
|
|
: "0", "cc");
|
| 339 |
|
|
#endif
|
| 340 |
|
|
|
| 341 |
|
|
/* Revalidate clock comparator register */
|
| 342 |
|
|
asm volatile(
|
| 343 |
|
|
" stck 0(%1)\n"
|
| 344 |
|
|
" sckc 0(%1)"
|
| 345 |
|
|
: "=m" (tmpclock) : "a" (&(tmpclock)) : "cc", "memory");
|
| 346 |
|
|
|
| 347 |
|
|
/* Check if old PSW is valid */
|
| 348 |
|
|
if (!mci->wp)
|
| 349 |
|
|
/*
|
| 350 |
|
|
* Can't tell if we come from user or kernel mode
|
| 351 |
|
|
* -> stopping machine.
|
| 352 |
|
|
*/
|
| 353 |
|
|
s390_handle_damage("old psw invalid.");
|
| 354 |
|
|
|
| 355 |
|
|
if (!mci->ms || !mci->pm || !mci->ia)
|
| 356 |
|
|
kill_task = 1;
|
| 357 |
|
|
|
| 358 |
|
|
return kill_task;
|
| 359 |
|
|
}
|
| 360 |
|
|
|
| 361 |
|
|
#define MAX_IPD_COUNT 29
|
| 362 |
|
|
#define MAX_IPD_TIME (5 * 60 * USEC_PER_SEC) /* 5 minutes */
|
| 363 |
|
|
|
| 364 |
|
|
/*
|
| 365 |
|
|
* machine check handler.
|
| 366 |
|
|
*/
|
| 367 |
|
|
void
|
| 368 |
|
|
s390_do_machine_check(struct pt_regs *regs)
|
| 369 |
|
|
{
|
| 370 |
|
|
static DEFINE_SPINLOCK(ipd_lock);
|
| 371 |
|
|
static unsigned long long last_ipd;
|
| 372 |
|
|
static int ipd_count;
|
| 373 |
|
|
unsigned long long tmp;
|
| 374 |
|
|
struct mci *mci;
|
| 375 |
|
|
struct mcck_struct *mcck;
|
| 376 |
|
|
int umode;
|
| 377 |
|
|
|
| 378 |
|
|
lockdep_off();
|
| 379 |
|
|
|
| 380 |
|
|
mci = (struct mci *) &S390_lowcore.mcck_interruption_code;
|
| 381 |
|
|
mcck = &__get_cpu_var(cpu_mcck);
|
| 382 |
|
|
umode = user_mode(regs);
|
| 383 |
|
|
|
| 384 |
|
|
if (mci->sd)
|
| 385 |
|
|
/* System damage -> stopping machine */
|
| 386 |
|
|
s390_handle_damage("received system damage machine check.");
|
| 387 |
|
|
|
| 388 |
|
|
if (mci->pd) {
|
| 389 |
|
|
if (mci->b) {
|
| 390 |
|
|
/* Processing backup -> verify if we can survive this */
|
| 391 |
|
|
u64 z_mcic, o_mcic, t_mcic;
|
| 392 |
|
|
#ifdef CONFIG_64BIT
|
| 393 |
|
|
z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<29);
|
| 394 |
|
|
o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 |
|
| 395 |
|
|
1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 |
|
| 396 |
|
|
1ULL<<30 | 1ULL<<21 | 1ULL<<20 | 1ULL<<17 |
|
| 397 |
|
|
1ULL<<16);
|
| 398 |
|
|
#else
|
| 399 |
|
|
z_mcic = (1ULL<<63 | 1ULL<<59 | 1ULL<<57 | 1ULL<<50 |
|
| 400 |
|
|
1ULL<<29);
|
| 401 |
|
|
o_mcic = (1ULL<<43 | 1ULL<<42 | 1ULL<<41 | 1ULL<<40 |
|
| 402 |
|
|
1ULL<<36 | 1ULL<<35 | 1ULL<<34 | 1ULL<<32 |
|
| 403 |
|
|
1ULL<<30 | 1ULL<<20 | 1ULL<<17 | 1ULL<<16);
|
| 404 |
|
|
#endif
|
| 405 |
|
|
t_mcic = *(u64 *)mci;
|
| 406 |
|
|
|
| 407 |
|
|
if (((t_mcic & z_mcic) != 0) ||
|
| 408 |
|
|
((t_mcic & o_mcic) != o_mcic)) {
|
| 409 |
|
|
s390_handle_damage("processing backup machine "
|
| 410 |
|
|
"check with damage.");
|
| 411 |
|
|
}
|
| 412 |
|
|
|
| 413 |
|
|
/*
|
| 414 |
|
|
* Nullifying exigent condition, therefore we might
|
| 415 |
|
|
* retry this instruction.
|
| 416 |
|
|
*/
|
| 417 |
|
|
|
| 418 |
|
|
spin_lock(&ipd_lock);
|
| 419 |
|
|
|
| 420 |
|
|
tmp = get_clock();
|
| 421 |
|
|
|
| 422 |
|
|
if (((tmp - last_ipd) >> 12) < MAX_IPD_TIME)
|
| 423 |
|
|
ipd_count++;
|
| 424 |
|
|
else
|
| 425 |
|
|
ipd_count = 1;
|
| 426 |
|
|
|
| 427 |
|
|
last_ipd = tmp;
|
| 428 |
|
|
|
| 429 |
|
|
if (ipd_count == MAX_IPD_COUNT)
|
| 430 |
|
|
s390_handle_damage("too many ipd retries.");
|
| 431 |
|
|
|
| 432 |
|
|
spin_unlock(&ipd_lock);
|
| 433 |
|
|
}
|
| 434 |
|
|
else {
|
| 435 |
|
|
/* Processing damage -> stopping machine */
|
| 436 |
|
|
s390_handle_damage("received instruction processing "
|
| 437 |
|
|
"damage machine check.");
|
| 438 |
|
|
}
|
| 439 |
|
|
}
|
| 440 |
|
|
if (s390_revalidate_registers(mci)) {
|
| 441 |
|
|
if (umode) {
|
| 442 |
|
|
/*
|
| 443 |
|
|
* Couldn't restore all register contents while in
|
| 444 |
|
|
* user mode -> mark task for termination.
|
| 445 |
|
|
*/
|
| 446 |
|
|
mcck->kill_task = 1;
|
| 447 |
|
|
mcck->mcck_code = *(unsigned long long *) mci;
|
| 448 |
|
|
set_thread_flag(TIF_MCCK_PENDING);
|
| 449 |
|
|
}
|
| 450 |
|
|
else
|
| 451 |
|
|
/*
|
| 452 |
|
|
* Couldn't restore all register contents while in
|
| 453 |
|
|
* kernel mode -> stopping machine.
|
| 454 |
|
|
*/
|
| 455 |
|
|
s390_handle_damage("unable to revalidate registers.");
|
| 456 |
|
|
}
|
| 457 |
|
|
|
| 458 |
|
|
if (mci->cd) {
|
| 459 |
|
|
/* Timing facility damage */
|
| 460 |
|
|
s390_handle_damage("TOD clock damaged");
|
| 461 |
|
|
}
|
| 462 |
|
|
|
| 463 |
|
|
if (mci->ed && mci->ec) {
|
| 464 |
|
|
/* External damage */
|
| 465 |
|
|
if (S390_lowcore.external_damage_code & (1U << ED_ETR_SYNC))
|
| 466 |
|
|
etr_sync_check();
|
| 467 |
|
|
if (S390_lowcore.external_damage_code & (1U << ED_ETR_SWITCH))
|
| 468 |
|
|
etr_switch_to_local();
|
| 469 |
|
|
}
|
| 470 |
|
|
|
| 471 |
|
|
if (mci->se)
|
| 472 |
|
|
/* Storage error uncorrected */
|
| 473 |
|
|
s390_handle_damage("received storage error uncorrected "
|
| 474 |
|
|
"machine check.");
|
| 475 |
|
|
|
| 476 |
|
|
if (mci->ke)
|
| 477 |
|
|
/* Storage key-error uncorrected */
|
| 478 |
|
|
s390_handle_damage("received storage key-error uncorrected "
|
| 479 |
|
|
"machine check.");
|
| 480 |
|
|
|
| 481 |
|
|
if (mci->ds && mci->fa)
|
| 482 |
|
|
/* Storage degradation */
|
| 483 |
|
|
s390_handle_damage("received storage degradation machine "
|
| 484 |
|
|
"check.");
|
| 485 |
|
|
|
| 486 |
|
|
if (mci->cp) {
|
| 487 |
|
|
/* Channel report word pending */
|
| 488 |
|
|
mcck->channel_report = 1;
|
| 489 |
|
|
set_thread_flag(TIF_MCCK_PENDING);
|
| 490 |
|
|
}
|
| 491 |
|
|
|
| 492 |
|
|
if (mci->w) {
|
| 493 |
|
|
/* Warning pending */
|
| 494 |
|
|
mcck->warning = 1;
|
| 495 |
|
|
set_thread_flag(TIF_MCCK_PENDING);
|
| 496 |
|
|
}
|
| 497 |
|
|
lockdep_on();
|
| 498 |
|
|
}
|
| 499 |
|
|
|
| 500 |
|
|
/*
|
| 501 |
|
|
* s390_init_machine_check
|
| 502 |
|
|
*
|
| 503 |
|
|
* initialize machine check handling
|
| 504 |
|
|
*/
|
| 505 |
|
|
static int
|
| 506 |
|
|
machine_check_init(void)
|
| 507 |
|
|
{
|
| 508 |
|
|
init_MUTEX_LOCKED(&m_sem);
|
| 509 |
|
|
ctl_set_bit(14, 25); /* enable external damage MCH */
|
| 510 |
|
|
ctl_set_bit(14, 27); /* enable system recovery MCH */
|
| 511 |
|
|
#ifdef CONFIG_MACHCHK_WARNING
|
| 512 |
|
|
ctl_set_bit(14, 24); /* enable warning MCH */
|
| 513 |
|
|
#endif
|
| 514 |
|
|
return 0;
|
| 515 |
|
|
}
|
| 516 |
|
|
|
| 517 |
|
|
/*
|
| 518 |
|
|
* Initialize the machine check handler really early to be able to
|
| 519 |
|
|
* catch all machine checks that happen during boot
|
| 520 |
|
|
*/
|
| 521 |
|
|
arch_initcall(machine_check_init);
|
| 522 |
|
|
|
| 523 |
|
|
/*
|
| 524 |
|
|
* Machine checks for the channel subsystem must be enabled
|
| 525 |
|
|
* after the channel subsystem is initialized
|
| 526 |
|
|
*/
|
| 527 |
|
|
static int __init
|
| 528 |
|
|
machine_check_crw_init (void)
|
| 529 |
|
|
{
|
| 530 |
|
|
struct task_struct *task;
|
| 531 |
|
|
|
| 532 |
|
|
task = kthread_run(s390_collect_crw_info, &m_sem, "kmcheck");
|
| 533 |
|
|
if (IS_ERR(task))
|
| 534 |
|
|
return PTR_ERR(task);
|
| 535 |
|
|
ctl_set_bit(14, 28); /* enable channel report MCH */
|
| 536 |
|
|
return 0;
|
| 537 |
|
|
}
|
| 538 |
|
|
|
| 539 |
|
|
device_initcall (machine_check_crw_init);
|
