diff options
| -rw-r--r-- | arch/s390/include/asm/vdso.h | 1 | ||||
| -rw-r--r-- | arch/s390/kernel/setup.c | 2 | ||||
| -rw-r--r-- | arch/s390/kernel/vdso.c | 14 |
3 files changed, 16 insertions, 1 deletions
diff --git a/arch/s390/include/asm/vdso.h b/arch/s390/include/asm/vdso.h index 88bdc477a843..ac7bf9806a9d 100644 --- a/arch/s390/include/asm/vdso.h +++ b/arch/s390/include/asm/vdso.h @@ -46,6 +46,7 @@ struct vdso_per_cpu_data { extern struct vdso_data *vdso_data; +void vdso_alloc_boot_cpu(struct lowcore *lowcore); int vdso_alloc_per_cpu(struct lowcore *lowcore); void vdso_free_per_cpu(struct lowcore *lowcore); diff --git a/arch/s390/kernel/setup.c b/arch/s390/kernel/setup.c index c07e6d6a91cc..bf139f9e120e 100644 --- a/arch/s390/kernel/setup.c +++ b/arch/s390/kernel/setup.c @@ -349,7 +349,7 @@ static void __init setup_lowcore(void) if (MACHINE_HAS_GS) lc->mcesad |= bits; } - lc->vdso_per_cpu_data = (unsigned long) &lc->paste[0]; + vdso_alloc_boot_cpu(lc); lc->sync_enter_timer = S390_lowcore.sync_enter_timer; lc->async_enter_timer = S390_lowcore.async_enter_timer; lc->exit_timer = S390_lowcore.exit_timer; diff --git a/arch/s390/kernel/vdso.c b/arch/s390/kernel/vdso.c index aaf8f77a636e..0520854a4dab 100644 --- a/arch/s390/kernel/vdso.c +++ b/arch/s390/kernel/vdso.c @@ -140,6 +140,20 @@ static void __init vdso_init_data(struct vdso_data *vd) */ #define SEGMENT_ORDER 2 +/* + * The initial vdso_data structure for the boot CPU. Eventually + * it is replaced with a properly allocated structure in vdso_init. + * This is necessary because a valid S390_lowcore.vdso_per_cpu_data + * pointer is required to be able to return from an interrupt or + * program check. See the exit paths in entry.S. + */ +struct vdso_data boot_vdso_data __initdata; + +void __init vdso_alloc_boot_cpu(struct lowcore *lowcore) +{ + lowcore->vdso_per_cpu_data = (unsigned long) &boot_vdso_data; +} + int vdso_alloc_per_cpu(struct lowcore *lowcore) { unsigned long segment_table, page_table, page_frame; |