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Message-ID: <a52781cd79104c978289d3d5e98b0cd4@AcuMS.aculab.com>
Date: Fri, 6 Oct 2023 08:28:04 +0000
From: David Laight <David.Laight@...LAB.COM>
To: 'Kees Cook' <keescook@...omium.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
"'linux@...musvillemoes.dk'" <linux@...musvillemoes.dk>,
'Steven Rostedt' <rostedt@...dmis.org>,
"'bvanassche@....org'" <bvanassche@....org>,
"torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
"Nathan Chancellor" <nathan@...nel.org>,
Nick Desaulniers <ndesaulniers@...gle.com>,
Arnd Bergmann <arnd@...db.de>,
"akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
Subject: RE: [PATCH v2 next] compiler.h: Move __is_constexpr() to compiler.h.
From: Kees Cook
> Sent: 05 October 2023 17:22
>
> On Thu, Oct 05, 2023 at 11:39:54AM +0000, David Laight wrote:
> > Prior to f747e6667ebb2 __is_constexpr() was in its only user minmax.h.
> > That commit moved it to const.h - but that file just defines ULL(x) and
> > UL(x) so that constants can be defined for .S and .c files.
> > So apart from the word 'const' it wasn't really a good location.
> > Instead move the definition to compiler.h just before the similar
> > is_signed_type() and is_unsigned_type().
> > This may not be a good long-term home, but the three definitions
> > belong together.
> >
> > Signed-off-by: David Laight <david.laight@...lab.com>
>
> Yeah, this is what I'd expect (a duplicate move in tools/). Thanks!
I did try to run something that might have built 'perf'.
But it complained about a lot of stuff not being installed.
I do wonder if a better home for all these is_xxx() and __is_xxx()
would be at the top of build_bug.h.
While they can be used on their own (eg with __builtin_choose_expr())
they are typically used with the compile-time asserts
(or at least with code that is also doing asserts.)
So there might only be a few places that need the extra #include.
David
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