From da1776733617c4a92319eddb4e765ce60426b20a Mon Sep 17 00:00:00 2001 From: Vasily Gorbik Date: Thu, 20 Jun 2019 10:18:35 +0200 Subject: [PATCH] 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: Vasily Gorbik --- arch/s390/include/asm/unwind.h | 19 ------------------- 1 file changed, 19 deletions(-) diff --git a/arch/s390/include/asm/unwind.h b/arch/s390/include/asm/unwind.h index 6eb2ef105d87..d827b5b9a32c 100644 --- a/arch/s390/include/asm/unwind.h +++ b/arch/s390/include/asm/unwind.h @@ -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 */