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authorVasily Gorbik <gor@linux.ibm.com>2019-06-20 10:18:35 +0200
committerVasily Gorbik <gor@linux.ibm.com>2019-07-02 16:00:27 +0200
commitda1776733617c4a92319eddb4e765ce60426b20a (patch)
treec50aa62af49dff4125a556be6c15dbded73025f1 /arch/s390
parent20955746320e252b41c6b3505587766012e3e06d (diff)
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 <gor@linux.ibm.com>
Diffstat (limited to 'arch/s390')
-rw-r--r--arch/s390/include/asm/unwind.h19
1 files changed, 0 insertions, 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 */