[PATCH 1/2] Add __compat_aligned_s64 and __compat_aligned_u64

[H.J. Lu]

X32 uses the 32-bit compat layer for 32-bit kernel interface, which is
also used by ia32.  But long long is 4-byte aligned for ia32 and 8-byte
aligned for x32.  When the long long field in a system call struct has
different offsets between ia32 and x32 due to alignment padding, like
struct snd_ctl_elem_value in include/uapi/sound/asound.h, we need to
either add a special case for x32 or we can use 4-byte aligned long
long in the system call struct so that x32 can share the same compat
system cal with ia32.  This patch adds __compat_aligned_s64 and
__compat_aligned_u64 to include/uapi/asm-generic/int-ll64.h.  By
default, they are the same as __s64/__u64.  It does the following
things:

1. Add default __compat_aligned_s64/__compat_aligned_u64 to
include/uapi/asm-generic/int-ll64.h.
2. Add arch/x86/include/asm/types.h for kernel internal use, which is the
same as before, i.e., <asm-generic/types.h>.
3. Change arch/x86/include/uapi/asm/types.h not to use the default
include/uapi/asm-generic/int-ll64.h.  Instead, it has a modified copy
of include/uapi/asm-generic/int-ll64.h with 4-byte aligned
__compat_aligned_s64 and __compat_aligned_u64 for x32 and ia32.

When building x86 kernel, nothing is changed.  The difference is
x32 can use 4-byte aligned long long for system calls so that it
can share the same 32-bit compat system call with ia32.


-- 
H.J.

Attachment: 0001-Add-__compat_aligned_s64-and-__compat_aligned_u64.patch
Description: Binary data