Re: [Xen-devel] [PATCH] arm64: remove PSR bit macros from uapi

[Ian Campbell <Ian.Campbell@xxxxxxxxxx>]

On Fri, 2013-04-12 at 16:50 +0100, Ian Campbell wrote:
> I'm not sure which (if any) spec includes ptrace.h but signal.h isn't
> defined to #define PSR_FOO. Maybe the real bug is the signal.h ends up
> including ptrace.h at all?

Having spoken to someone who understands this stuff better than I
(although I still reserve the right to be talking out my a**e) it
appears this is the case. ptrace.h is allowed to define whatever it
likes because it's not defined by a standard but signal.h is specified
by POSIX and is not allowed to define anything which isn't in the POSIX
reserved namespace or which isn't explicitly mentions, which PSR_* is
not.

So it seems like the bug is on the libc side for including this
particular #include chain?

On the flip side is there any reason for the Linux uapi headers to be
including architectural constants? e.g. the x86 uapi/ptrace.h doesn't
define the RFLAGS bits etc...

Ian.


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