openkylin
/
platform_kernel-5.15
mirror of https://gitee.com/openkylin/platform_kernel-5.15.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

[S390] Dont overwrite lowcores on smp_send_stop(). 

Don't perform a sigp store-status-at-address on smp_send_stop().
It will overwrite the lowcores of other cpus and destroys valueable
debug informations.

Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Heiko Carstens 2007-11-20 11:13:37 +01:00 committed by Martin Schwidefsky
parent ce7e9fae8d
commit 677d762319
1 changed files with 7 additions and 49 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

56
arch/s390/kernel/smp.c
View File

@ -193,10 +193,16 @@ int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
} }
EXPORT_SYMBOL(smp_call_function_single); EXPORT_SYMBOL(smp_call_function_single);
static void do_send_stop(void) void smp_send_stop(void)
{ {
int cpu, rc; int cpu, rc;
/* Disable all interrupts/machine checks */
__load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK);
/* write magic number to zero page (absolute 0) */
lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC;
/* stop all processors */ /* stop all processors */
for_each_online_cpu(cpu) { for_each_online_cpu(cpu) {
if (cpu == smp_processor_id()) if (cpu == smp_processor_id())
@ -204,60 +210,12 @@ static void do_send_stop(void)
do { do {
rc = signal_processor(cpu, sigp_stop); rc = signal_processor(cpu, sigp_stop);
} while (rc == sigp_busy); } while (rc == sigp_busy);
}
}
static void do_store_status(void)
{
int cpu, rc;
/* store status of all processors in their lowcores (real 0) */
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
do {
rc = signal_processor_p(
(__u32)(unsigned long) lowcore_ptr[cpu], cpu,
sigp_store_status_at_address);
} while (rc == sigp_busy);
}
}
static void do_wait_for_stop(void)
{
int cpu;
/* Wait for all other cpus to enter stopped state */
for_each_online_cpu(cpu) {
if (cpu == smp_processor_id())
continue;
while (!smp_cpu_not_running(cpu)) while (!smp_cpu_not_running(cpu))
cpu_relax(); cpu_relax();
} }
} }
/*
* this function sends a 'stop' sigp to all other CPUs in the system.
* it goes straight through.
*/
void smp_send_stop(void)
{
/* Disable all interrupts/machine checks */
__load_psw_mask(psw_kernel_bits & ~PSW_MASK_MCHECK);
/* write magic number to zero page (absolute 0) */
lowcore_ptr[smp_processor_id()]->panic_magic = __PANIC_MAGIC;
/* stop other processors. */
do_send_stop();
/* wait until other processors are stopped */
do_wait_for_stop();
/* store status of other processors. */
do_store_status();
}
/* /*
* Reboot, halt and power_off routines for SMP. * Reboot, halt and power_off routines for SMP.
*/ */