linux/arch/s390/include/asm/text-patching.h

/* 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 */
s390: introduce text_poke_sync() Introduce a text_poke_sync() similar to what x86 has. This can be used to execute a serializing instruction on all CPUs (including the current one). Note: according to the Principles of Operation an IPI (= interrupt) will already serialize a CPU, however it is better to be explicit. In addition on_each_cpu() makes sure that also the current CPU get serialized - just to make sure that possible preemption can prevent some theoretical case where a CPU will not be serialized. Therefore text_poke_sync() has to be used whenever code got modified, just to avoid to rely on implicit serialization. Also introduce text_poke_sync_lock() which will also disable CPU hotplug, to prevent that any CPU is just going online with a prefetched old version of a modified instruction. Signed-off-by: Heiko Carstens <hca@linux.ibm.com> Signed-off-by: Vasily Gorbik <gor@linux.ibm.com> 2021-10-01 12:47:01 +02:00			`/* 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 */`