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Commit da177673 authored by Vasily Gorbik's avatar Vasily Gorbik
Browse files

s390/unwind: cleanup unused READ_ONCE_TASK_STACK 



Kasan instrumentation of backchain unwinder stack reads is disabled
completely and simply uses READ_ONCE_NOCHECK now.
READ_ONCE_TASK_STACK macro is unused and could be removed.

Signed-off-by: default avatarVasily Gorbik <gor@linux.ibm.com>
parent 20955746

arch/s390/include/asm/unwind.h

+0 −19
Original line number Diff line number Diff line
@@ -79,23 +79,4 @@ static inline void unwind_module_init(struct module *mod, void *orc_ip, 
				      size_t orc_ip_size, void *orc,

				      size_t orc_size) {}



#ifdef CONFIG_KASAN

/*

 * This disables KASAN checking when reading a value from another task's stack,

 * since the other task could be running on another CPU and could have poisoned

 * the stack in the meantime.

 */

#define READ_ONCE_TASK_STACK(task, x)			\

({							\

	unsigned long val;				\

	if (task == current)				\

		val = READ_ONCE(x);			\

	else						\

		val = READ_ONCE_NOCHECK(x);		\

	val;						\

})

#else

#define READ_ONCE_TASK_STACK(task, x) READ_ONCE(x)

#endif



#endif /* _ASM_S390_UNWIND_H */