diff options
| -rw-r--r-- | arch/s390/include/asm/text-patching.h | 16 | ||||
| -rw-r--r-- | arch/s390/kernel/alternative.c | 20 |
2 files changed, 36 insertions, 0 deletions
diff --git a/arch/s390/include/asm/text-patching.h b/arch/s390/include/asm/text-patching.h new file mode 100644 index 000000000000..b219056a8817 --- /dev/null +++ b/arch/s390/include/asm/text-patching.h @@ -0,0 +1,16 @@ +/* SPDX-License-Identifier: GPL-2.0 */ + +#ifndef _ASM_S390_TEXT_PATCHING_H +#define _ASM_S390_TEXT_PATCHING_H + +#include <asm/barrier.h> + +static __always_inline void sync_core(void) +{ + bcr_serialize(); +} + +void text_poke_sync(void); +void text_poke_sync_lock(void); + +#endif /* _ASM_S390_TEXT_PATCHING_H */ diff --git a/arch/s390/kernel/alternative.c b/arch/s390/kernel/alternative.c index c22ea1c3ef84..cce0ddee2d02 100644 --- a/arch/s390/kernel/alternative.c +++ b/arch/s390/kernel/alternative.c @@ -1,5 +1,8 @@ // SPDX-License-Identifier: GPL-2.0 #include <linux/module.h> +#include <linux/cpu.h> +#include <linux/smp.h> +#include <asm/text-patching.h> #include <asm/alternative.h> #include <asm/facility.h> #include <asm/nospec-branch.h> @@ -110,3 +113,20 @@ void __init apply_alternative_instructions(void) { apply_alternatives(__alt_instructions, __alt_instructions_end); } + +static void do_sync_core(void *info) +{ + sync_core(); +} + +void text_poke_sync(void) +{ + on_each_cpu(do_sync_core, NULL, 1); +} + +void text_poke_sync_lock(void) +{ + cpus_read_lock(); + text_poke_sync(); + cpus_read_unlock(); +} |