From: Nick Desaulniers <ndesaulniers@google.com>
To: Nathan Chancellor <nathan@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Rasmus Villemoes <linux@rasmusvillemoes.dk>,
Masahiro Yamada <masahiroy@kernel.org>,
Joe Perches <joe@perches.com>, Arnd Bergmann <arnd@kernel.org>,
Stephen Rothwell <sfr@canb.auug.org.au>,
llvm@lists.linux.dev, linux-kernel@vger.kernel.org
Subject: Re: [PATCH 02/10] compiler.h: drop fallback overflow checkers
Date: Tue, 14 Sep 2021 08:33:54 -0700 [thread overview]
Message-ID: <CAKwvOdn==O+yJHLbxSEyx=xwpKbOsXY9_YkyU2m7+kiEwtPMrA@mail.gmail.com> (raw)
In-Reply-To: <YTvyiv6M05Zk/C70@archlinux-ax161>
On Fri, Sep 10, 2021 at 5:04 PM Nathan Chancellor <nathan@kernel.org> wrote:
>
> On Fri, Sep 10, 2021 at 04:40:39PM -0700, Nick Desaulniers wrote:
> > diff --git a/include/linux/overflow.h b/include/linux/overflow.h
> > index 0f12345c21fb..4669632bd72b 100644
> > --- a/include/linux/overflow.h
> > +++ b/include/linux/overflow.h
> > @@ -6,12 +6,9 @@
> > #include <linux/limits.h>
> >
> > /*
> > - * In the fallback code below, we need to compute the minimum and
> > - * maximum values representable in a given type. These macros may also
> > - * be useful elsewhere, so we provide them outside the
> > - * COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW block.
> > - *
> > - * It would seem more obvious to do something like
> > + * We need to compute the minimum and maximum values representable in a given
> > + * type. These macros may also be useful elsewhere. It would seem more obvious
> > + * to do something like:
> > *
> > * #define type_min(T) (T)(is_signed_type(T) ? (T)1 << (8*sizeof(T)-1) : 0)
> > * #define type_max(T) (T)(is_signed_type(T) ? ((T)1 << (8*sizeof(T)-1)) - 1 : ~(T)0)
>
> The signed and type macros right below this comment can be removed as
> they were only used in the !COMPILER_HAS_GENERIC_BUILTIN_OVERFLOW case.
Did you check for users outside of this header?
I see:
type_min ->
lib/test_scanf.c:189
include/rdma/uverbs_ioctl.h:951
include/rdma/uverbs_ioctl.h:973
type_max ->
lib/test_scanf.c:189
lib/test_scanf.c:190
include/rdma/uverbs_ioctl.h:952
include/rdma/uverbs_ioctl.h:962
include/rdma/uverbs_ioctl.h:974
include/rdma/uverbs_ioctl.h:985
is_signed_type has many many users throughout the kernel.
Or were you referring to other defines?
>
> Also applies to the tools/ version.
The version in tools/ should probably be "refreshed" ie. copy+pasted
over. Why there is a separate copy under tools/...
--
Thanks,
~Nick Desaulniers
next prev parent reply other threads:[~2021-09-14 15:34 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-09-10 23:40 [PATCH 00/10] raise minimum GCC version to 5.1 Nick Desaulniers
2021-09-10 23:40 ` [PATCH 01/10] Documentation: raise minimum supported version of GCC " Nick Desaulniers
2021-09-10 23:55 ` Nathan Chancellor
2021-09-11 0:16 ` Nick Desaulniers
2021-09-13 16:22 ` Kees Cook
2021-09-10 23:40 ` [PATCH 02/10] compiler.h: drop fallback overflow checkers Nick Desaulniers
2021-09-11 0:04 ` Nathan Chancellor
2021-09-14 15:33 ` Nick Desaulniers [this message]
2021-09-14 16:04 ` Nathan Chancellor
2021-09-13 16:21 ` Kees Cook
2021-09-10 23:40 ` [PATCH 03/10] mm/ksm: remove old GCC 4.9+ check Nick Desaulniers
2021-09-11 0:07 ` Nathan Chancellor
2021-09-13 16:22 ` Kees Cook
2021-09-10 23:40 ` [PATCH 04/10] Kconfig.debug: drop GCC 5+ version check for DWARF5 Nick Desaulniers
2021-09-11 0:08 ` Nathan Chancellor
2021-09-13 16:23 ` Kees Cook
2021-09-10 23:40 ` [PATCH 05/10] riscv: remove Kconfig check for GCC version for ARCH_RV64I Nick Desaulniers
2021-09-11 0:09 ` Nathan Chancellor
2021-09-13 16:23 ` Kees Cook
2021-10-05 0:40 ` Palmer Dabbelt
2021-10-05 0:50 ` Kees Cook
2021-10-05 0:57 ` Palmer Dabbelt
2021-09-10 23:40 ` [PATCH 06/10] powerpc: remove GCC version check for UPD_CONSTR Nick Desaulniers
2021-09-10 23:48 ` Nathan Chancellor
2021-09-11 10:43 ` Michael Ellerman
2021-09-11 15:34 ` Christophe Leroy
2021-09-10 23:40 ` [PATCH 07/10] arm64: remove GCC version check for ARCH_SUPPORTS_INT128 Nick Desaulniers
2021-09-11 0:10 ` Nathan Chancellor
2021-09-13 16:25 ` Kees Cook
2021-09-16 13:23 ` Catalin Marinas
2021-09-10 23:40 ` [PATCH 08/10] Makefile: drop GCC < 5 -fno-var-tracking-assignments workaround Nick Desaulniers
2021-09-11 0:11 ` Nathan Chancellor
2021-09-13 16:25 ` Kees Cook
2021-09-10 23:40 ` [PATCH 09/10] compiler-gcc.h: drop checks for older GCC versions Nick Desaulniers
2021-09-11 0:12 ` Nathan Chancellor
2021-09-13 16:26 ` Kees Cook
2021-09-10 23:40 ` [PATCH 10/10] vmlinux.lds.h: remove old check for GCC 4.9 Nick Desaulniers
2021-09-10 23:50 ` Nathan Chancellor
2021-09-14 15:21 ` Nick Desaulniers
2021-09-13 16:28 ` Kees Cook
2021-09-11 2:19 ` [PATCH 00/10] raise minimum GCC version to 5.1 Kees Cook
2021-09-11 10:42 ` Michael Ellerman
2021-09-13 9:49 ` Pavel Machek
2021-09-13 16:20 ` Kees Cook
2021-09-13 11:27 ` Arnd Bergmann
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