user_access_begin
static __must_check __always_inline bool user_access_begin(const void __user *ptr, size_t len)
#define user_access_begin(a,b) user_access_begin(a,b)
#define user_access_begin(p, l) __user_access_begin(p, l, KUAP_READ_WRITE)
static __must_check __always_inline bool user_access_begin(const void __user *ptr, size_t len)
#define user_access_begin user_access_begin
static __must_check __always_inline bool user_access_begin(const void __user *ptr, size_t len)
#define user_access_begin(a,b) user_access_begin(a,b)
#define user_access_begin(ptr,len) access_ok(ptr, len)