From: Guo Ren <>

$ grep strlen_user * -r
arch/csky/include/asm/uaccess.h:#define strlen_user(str) strnlen_user(str, 
arch/csky/lib/usercopy.c: * strlen_user: - Get the size of a string in user 
arch/ia64/lib/strlen.S: // Please note that in the case of strlen() as opposed 
to strlen_user()
arch/mips/lib/strnlen_user.S: *  make strlen_user and strnlen_user access the 
first few KSEG0
arch/nds32/include/asm/uaccess.h:extern __must_check long strlen_user(const 
char __user * str);
arch/nios2/include/asm/uaccess.h:extern __must_check long strlen_user(const 
char __user *str);
arch/riscv/include/asm/uaccess.h:extern long __must_check strlen_user(const 
char __user *str);
kernel/trace/trace_probe_tmpl.h:static nokprobe_inline int 
fetch_store_strlen_user(unsigned long addr);
kernel/trace/trace_probe_tmpl.h:                        ret += 
fetch_store_strlen_user(val + code->offset);
kernel/trace/trace_uprobe.c:fetch_store_strlen_user(unsigned long addr)
kernel/trace/trace_kprobe.c:fetch_store_strlen_user(unsigned long addr)
kernel/trace/trace_kprobe.c:            return fetch_store_strlen_user(addr);

See grep result, nobody uses it.

Signed-off-by: Guo Ren <>
Cc: Arnd Bergmann <>
 arch/riscv/include/asm/uaccess.h | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/riscv/include/asm/uaccess.h b/arch/riscv/include/asm/uaccess.h
index 824b2c9..4297f43 100644
--- a/arch/riscv/include/asm/uaccess.h
+++ b/arch/riscv/include/asm/uaccess.h
@@ -372,7 +372,6 @@ raw_copy_to_user(void __user *to, const void *from, 
unsigned long n)
 extern long strncpy_from_user(char *dest, const char __user *src, long count);
-extern long __must_check strlen_user(const char __user *str);
 extern long __must_check strnlen_user(const char __user *str, long n);

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