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From: Nick Desaulniers <ndesaulniers@google.com>
To: Masahiro Yamada <masahiroy@kernel.org>
Cc: LKML <linux-kernel@vger.kernel.org>,
	"David S . Miller" <davem@davemloft.net>,
	Linus Torvalds <torvalds@linux-foundation.org>,
	Kees Cook <keescook@chromium.org>,
	clang-built-linux <clang-built-linux@googlegroups.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	"open list:HARDWARE RANDOM NUMBER GENERATOR CORE" 
	<linux-crypto@vger.kernel.org>, Ingo Molnar <mingo@redhat.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Borislav Petkov <bp@alien8.de>,
	Peter Zijlstra <peterz@infradead.org>,
	"H . Peter Anvin" <hpa@zytor.com>,
	"maintainer:X86 ARCHITECTURE (32-BIT AND 64-BIT)"
	<x86@kernel.org>,
	Linux Kbuild mailing list <linux-kbuild@vger.kernel.org>,
	Jim Kukunas <james.t.kukunas@linux.intel.com>,
	NeilBrown <neilb@suse.de>,
	Yuanhan Liu <yuanhan.liu@linux.intel.com>
Subject: Re: [PATCH 01/16] lib/raid6/test: fix build on distros whose /bin/sh is not bash
Date: Thu, 26 Mar 2020 10:27:33 -0700
Message-ID: <CAKwvOdmGLmbghDAguisUZFUvGiBQVnfEogAFCtXaDLPxOLVYmA@mail.gmail.com> (raw)
In-Reply-To: <CAK7LNATXz=x7M-HOfWLf1fc_km5qBYa5u1i3Bj30C7aoJPGjSA@mail.gmail.com>

On Wed, Mar 25, 2020 at 11:49 PM Masahiro Yamada <masahiroy@kernel.org> wrote:
>
> On Wed, Mar 25, 2020 at 1:36 AM Nick Desaulniers
> <ndesaulniers@google.com> wrote:
> >
> > On Tue, Mar 24, 2020 at 1:49 AM Masahiro Yamada <masahiroy@kernel.org> wrote:
> > >
> > > You can test raid6 library code from user-space, like this:
> > >
> > >   $ cd lib/raid6/test
> > >   $ make
> > >
> > > The command in $(shell ...) function is evaluated by /bin/sh by default.
> > > (or, you can change the default shell by setting 'SHELL' in Makefile)
> > >
> > > Currently '>&/dev/null' is used to sink both stdout and stderr. Because
> > > this code is bash-ism, it only works when /bin/sh is a symbolic link to
> > > bash (this is the case on RHEL etc.)
> > >
> > > This does not work on Ubuntu where /bin/sh is a symbolic link to dash.
> > >
> > > I see lots of
> > >
> > >   /bin/sh: 1: Syntax error: Bad fd number
> > >
> > > and
> > >
> > >   warning "your version of binutils lacks ... support"
> > >
> > > Replace it with portable '>/dev/null 2>&1'.
> > >
> > > Fixes: 4f8c55c5ad49 ("lib/raid6: build proper files on corresponding arch")
> > > Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
> > > Acked-by: H. Peter Anvin (Intel) <hpa@zytor.com>
> > > ---
> > >
> > >  lib/raid6/test/Makefile | 6 +++---
> > >  1 file changed, 3 insertions(+), 3 deletions(-)
> > >
> > > diff --git a/lib/raid6/test/Makefile b/lib/raid6/test/Makefile
> > > index 3ab8720aa2f8..b9e6c3648be1 100644
> > > --- a/lib/raid6/test/Makefile
> > > +++ b/lib/raid6/test/Makefile
> > > @@ -35,13 +35,13 @@ endif
> > >  ifeq ($(IS_X86),yes)
> > >          OBJS   += mmx.o sse1.o sse2.o avx2.o recov_ssse3.o recov_avx2.o avx512.o recov_avx512.o
> > >          CFLAGS += $(shell echo "pshufb %xmm0, %xmm0" |         \
> > > -                    gcc -c -x assembler - >&/dev/null &&       \
> > > +                    gcc -c -x assembler - >/dev/null 2>&1 &&   \
> > >                      rm ./-.o && echo -DCONFIG_AS_SSSE3=1)
> > >          CFLAGS += $(shell echo "vpbroadcastb %xmm0, %ymm1" |   \
> > > -                    gcc -c -x assembler - >&/dev/null &&       \
> > > +                    gcc -c -x assembler - >/dev/null 2>&1 &&   \
> > >                      rm ./-.o && echo -DCONFIG_AS_AVX2=1)
> > >         CFLAGS += $(shell echo "vpmovm2b %k1, %zmm5" |          \
> > > -                   gcc -c -x assembler - >&/dev/null &&        \
> > > +                   gcc -c -x assembler - >/dev/null 2>&1 &&    \
> >
> > These should all use $(CC) rather than hardcode gcc.
>
>
> Right, I had noticed this.
>
> We often fall between
> "let's fix this too while we are here"
> vs
> "do not do multiple things in a single patch"
>
>
> If we replace gcc -> $(CC),
> we also need to touch line 51 for consistency:
>
>        gcc -c -x c - >/dev/null && rm ./-.o && echo yes)
>
> ..., which is not our main interest now.
>
> So, I leave it to a follow-up patch
> if somebody has interest in it.

Haha, ok, no worries.
Reviewed-by: Nick Desaulniers <ndesaulniers@google.com>

-- 
Thanks,
~Nick Desaulniers

  reply index

Thread overview: 34+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-03-24  8:48 [PATCH 00/16] x86, crypto: remove always-defined CONFIG_AS_* and cosolidate Kconfig/Makefiles Masahiro Yamada
2020-03-24  8:48 ` [PATCH 01/16] lib/raid6/test: fix build on distros whose /bin/sh is not bash Masahiro Yamada
2020-03-24 16:36   ` Nick Desaulniers
2020-03-26  6:48     ` Masahiro Yamada
2020-03-26 17:27       ` Nick Desaulniers [this message]
2020-03-24  8:48 ` [PATCH 02/16] x86: remove unneeded defined(__ASSEMBLY__) check from asm/dwarf2.h Masahiro Yamada
2020-03-24 16:43   ` Nick Desaulniers
2020-03-24  8:48 ` [PATCH 03/16] x86: remove always-defined CONFIG_AS_CFI Masahiro Yamada
2020-03-24  8:48 ` [PATCH 04/16] x86: remove unneeded (CONFIG_AS_)CFI_SIGNAL_FRAME Masahiro Yamada
2020-03-24 16:41   ` Nick Desaulniers
2020-03-24  8:48 ` [PATCH 05/16] x86: remove always-defined CONFIG_AS_CFI_SECTIONS Masahiro Yamada
2020-03-24  8:48 ` [PATCH 06/16] x86: remove always-defined CONFIG_AS_SSSE3 Masahiro Yamada
2020-03-24 16:56   ` Nick Desaulniers
2020-03-24  8:48 ` [PATCH 07/16] x86: remove always-defined CONFIG_AS_AVX Masahiro Yamada
2020-03-24  8:48 ` [PATCH 08/16] x86: add comments about the binutils version to support code in as-instr Masahiro Yamada
2020-03-24  8:48 ` [PATCH 09/16] x86: replace arch macros from compiler with CONFIG_X86_{32,64} Masahiro Yamada
2020-03-24  8:48 ` [PATCH 10/16] drm/i915: remove always-defined CONFIG_AS_MOVNTDQA Masahiro Yamada
2020-03-24  8:48 ` [PATCH 11/16] x86: probe assembler capabilities via kconfig instead of makefile Masahiro Yamada
2020-03-24 17:01   ` Nick Desaulniers
2020-03-24 17:17     ` Jason A. Donenfeld
2020-03-24 17:21       ` Masahiro Yamada
2020-03-24 17:33       ` Nick Desaulniers
2020-03-24  8:48 ` [PATCH 12/16] crypto: x86 - rework configuration based on Kconfig Masahiro Yamada
2020-03-24 11:54   ` Herbert Xu
2020-03-24  8:48 ` [PATCH 13/16] crypto: curve25519 - do not pollute dispatcher based on assembler Masahiro Yamada
2020-03-24 11:54   ` Herbert Xu
2020-03-24  8:48 ` [PATCH 14/16] Documentation/changes: Raise minimum supported binutils version to 2.23 Masahiro Yamada
2020-03-24  8:48 ` [PATCH 15/16] x86: update AS_* macros to binutils >=2.23, supporting ADX and AVX2 Masahiro Yamada
2020-03-24  8:48 ` [PATCH 16/16] crypto: x86 - clean up poly1305-x86_64-cryptogams.S by 'make clean' Masahiro Yamada
2020-03-24 11:55   ` Herbert Xu
2020-03-24 16:51 ` [PATCH 00/16] x86, crypto: remove always-defined CONFIG_AS_* and cosolidate Kconfig/Makefiles Linus Torvalds
2020-03-25  4:59 ` Ingo Molnar
2020-03-25  5:09   ` Masahiro Yamada
2020-03-26  9:20     ` Ingo Molnar

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