diff options
Diffstat (limited to 'arch/s390/mm/extmem.c')
| -rw-r--r-- | arch/s390/mm/extmem.c | 18 |
1 files changed, 16 insertions, 2 deletions
diff --git a/arch/s390/mm/extmem.c b/arch/s390/mm/extmem.c index a6b8b8ea9086..f7da53e212f5 100644 --- a/arch/s390/mm/extmem.c +++ b/arch/s390/mm/extmem.c @@ -530,6 +530,14 @@ segment_modify_shared (char *name, int do_nonshared) return rc; } +static void __dcss_diag_purge_on_cpu_0(void *data) +{ + struct dcss_segment *seg = (struct dcss_segment *)data; + unsigned long dummy; + + dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); +} + /* * Decrease the use count of a DCSS segment and remove * it from the address space if nobody is using it @@ -538,7 +546,6 @@ segment_modify_shared (char *name, int do_nonshared) void segment_unload(char *name) { - unsigned long dummy; struct dcss_segment *seg; if (!machine_is_vm()) @@ -556,7 +563,14 @@ segment_unload(char *name) kfree(seg->res); vmem_remove_mapping(seg->start_addr, seg->end - seg->start_addr + 1); list_del(&seg->list); - dcss_diag(&purgeseg_scode, seg->dcss_name, &dummy, &dummy); + /* + * Workaround for z/VM issue, where calling the DCSS unload diag on + * a non-IPL CPU would cause bogus sclp maximum memory detection on + * next IPL. + * IPL CPU 0 cannot be set offline, so the dcss_diag() call can + * directly be scheduled to that CPU. + */ + smp_call_function_single(0, __dcss_diag_purge_on_cpu_0, seg, 1); kfree(seg); out_unlock: mutex_unlock(&dcss_lock); |