On Mon, Nov 22, 2021, at 4:43 PM, Cyril Hrubis wrote:

This changes the __u64 and __s64 in userspace on 64bit platforms from
long long (unsigned) int to just long (unsigned) int in order to match
the uint64_t and int64_t size in userspace.

...

+
+#include <asm/bitsperlong.h>
+
 /*
- * int-ll64 is used everywhere now.
+ * int-ll64 is used everywhere in kernel now.
  */
-#include <asm-generic/int-ll64.h>
+#if __BITS_PER_LONG == 64 && !defined(__KERNEL__)
+# include <asm-generic/int-l64.h>
+#else
+# include <asm-generic/int-ll64.h>
+#endif

I am all for matching __uN / __sN to uintN_t / intN_t in userspace, but may I suggest the technically simpler and guaranteed-to-be-accurate

 /*
- * int-ll64 is used everywhere now.
+ * int-ll64 is used everywhere in kernel now.
+ * In user space match <stdint.h>.
  */
+#ifdef __KERNEL__
 # include <asm-generic/int-ll64.h>
+#elif __has_include (<bits/types.h>)
+# include <bits/types.h>
+typedef __int8_t __s8;
+typedef __uint8_t __u8;
+typedef __int16_t __s16;
+typedef __uint16_t __u16;
+typedef __int32_t __s32;
+typedef __uint32_t __u32;
+typedef __int64_t __s64;
+typedef __uint64_t __u64;
+#else
+# include <stdint.h>
+typedef int8_t __s8;
+typedef uint8_t __u8;
+typedef int16_t __s16;
+typedef uint16_t __u16;
+typedef int32_t __s32;
+typedef uint32_t __u32;
+typedef int64_t __s64;
+typedef uint64_t __u64;
+#endif

The middle clause could be dropped if we are okay with all uapi headers potentially exposing the non-implementation-namespace names defined by <stdint.h>.  I do not know what the musl libc equivalent of <bits/types.h> is.

zw