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Date:   Mon, 19 Jul 2021 16:23:13 +0200
From:   Petr =?utf-8?B?VmFuxJtr?= <arkamar@atlas.cz>
To:     Khem Raj <raj.khem@gmail.com>
Cc:     Denys Vlasenko <dvlasenk@redhat.com>,
        Ingo Molnar <mingo@redhat.com>, linux-kernel@vger.kernel.org,
        Alexander Shishkin <alexander.shishkin@linux.intel.com>,
        Arnaldo Carvalho de Melo <acme@kernel.org>,
        Chanho Park <parkch98@gmail.com>,
        Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
        Jiri Olsa <jolsa@redhat.com>,
        John Garry <john.garry@huawei.com>,
        Josh Poimboeuf <jpoimboe@redhat.com>,
        Kate Stewart <kstewart@linuxfoundation.org>,
        Leo Yan <leo.yan@linaro.org>,
        Mark Rutland <mark.rutland@arm.com>,
        Martin Schwidefsky <schwidefsky@de.ibm.com>,
        Masami Hiramatsu <mhiramat@kernel.org>,
        Mathieu Poirier <mathieu.poirier@linaro.org>,
        Matt Redfearn <matt.redfearn@mips.com>,
        Mike Leach <mike.leach@linaro.org>,
        Namhyung Kim <namhyung@kernel.org>,
        Peter Zijlstra <peterz@infradead.org>,
        Philippe Ombredanne <pombredanne@nexb.com>,
        Stephane Eranian <eranian@google.com>,
        Suzuki K Poulose <suzuki.poulose@arm.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Vasily Gorbik <gor@linux.ibm.com>,
        Will Deacon <will@kernel.org>
Subject: Re: Unknown __always_inline in linux/swab.h
Message-ID: <YPWK0QwTWw+r6yvy@arkam>
References: <YPGXXt6Z3O1W0AYS@arkam>
 <CAMKF1spJKc+vyiOg_upfEZmVKzyHCW569yJNYjHD2cJkA_4buA@mail.gmail.com>
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On Fri, Jul 16, 2021 at 08:41:57AM -0700, Khem Raj wrote:
> On Fri, Jul 16, 2021 at 7:27 AM Petr Vaněk <arkamar@atlas.cz> wrote:
> >
> > Hi all,
> >
> > I cannot build the kernel on my box with musl libc since release 5.12,
> > see the kernel 5.13.1 build log below.  Bisect points to the commit
> > 1d509f2a6ebc ("x86/insn: Support big endian cross-compiles") merged to
> > 5.12-rc1, but it probably only triggers the issue from different place.
> >
> > I searched through the mailing list [1] and it seems that people face to
> > a similar issue with perf tool as well [2-5]. Related issues were also
> > reported in Gentoo [6] and alpinelinux [7]. Both distributions basically
> > fixed it with the patch from [3] which works for me and it is the best
> > solution, in my opinion. I believe it should be applied to the upstream
> > and backported to 5.12 and 5.13.
> >
> > Systems with glibc are not affected because glibc defines its own
> > __always_inline in sys/cdefs.h which is indirectly included with stdio.h
> > and/or stdlib.h in top of tools/objtool/arch/x86/decode.c file.
> >
> > Note: I CCed you because your address was mentioned in [2-5] or in
> > bisected commit.
> >
> 
> does https://lore.kernel.org/lkml/20181213180129.1373-1-raj.khem@gmail.com/
> work for you ?

Yes, it does, however, I still think the
https://lore.kernel.org/lkml/1514973450-12447-1-git-send-email-matt.redfearn@mips.com/
patch is better, because linux/stddef.h includes linux/compiler_types.h,
which should be enough for linux/swab.h. However, your patch is
definitely safer if linux/compiler.h is needed for some reason I don't
see right now. 

> It was not applied but there were no comments on rejecting it either,
> so I guess it either fell through cracks somehow.
> 
> > Thanks,
> > Petr
> >
> > References:
> >
> > [1] https://lore.kernel.org/lkml/?q=swab+__always_inline
> > [2] https://lore.kernel.org/lkml/20210204005810.GZ854763@kernel.org/
> > [3] https://lore.kernel.org/lkml/1514973450-12447-1-git-send-email-matt.redfearn@mips.com/
> > [4] https://lore.kernel.org/lkml/20181213180129.1373-1-raj.khem@gmail.com/
> > [5] https://lore.kernel.org/lkml/20201210144844.72580-1-chanho61.park@samsung.com/
> > [6] https://bugs.gentoo.org/791364
> > [7] https://gitlab.alpinelinux.org/alpine/aports/-/issues/11119
> >
> > Build log:
> >
> > make[1]: Entering directory '/var/tmp/portage/linux'
> >   GEN     Makefile
> >   DESCEND objtool
> >   CALL    /usr/src/linux-5.13.1-gentoo/scripts/atomic/check-atomics.sh
> >   CALL    /usr/src/linux-5.13.1-gentoo/scripts/checksyscalls.sh
> >   CC      /var/tmp/portage/linux/tools/objtool/arch/x86/decode.o
> >   CC      /var/tmp/portage/linux/tools/objtool/str_error_r.o
> >   CC      /var/tmp/portage/linux/tools/objtool/librbtree.o
> > In file included from /usr/include/linux/byteorder/little_endian.h:13,
> >                  from /usr/include/asm/byteorder.h:5,
> >                  from /usr/src/linux-5.13.1-gentoo/tools/arch/x86/include/asm/insn.h:10,
> >                  from arch/x86/decode.c:10:
> > /usr/include/linux/swab.h:136:23: error: expected ';' before 'unsigned'
> >   136 | static __always_inline unsigned long __swab(const unsigned long y)
> >       |                       ^~~~~~~~~
> >       |                       ;
> > /usr/include/linux/swab.h:171:8: error: unknown type name '__always_inline'
> >   171 | static __always_inline __u16 __swab16p(const __u16 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/swab.h:171:30: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__swab16p'
> >   171 | static __always_inline __u16 __swab16p(const __u16 *p)
> >       |                              ^~~~~~~~~
> > /usr/include/linux/swab.h:184:8: error: unknown type name '__always_inline'
> >   184 | static __always_inline __u32 __swab32p(const __u32 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/swab.h:184:30: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__swab32p'
> >   184 | static __always_inline __u32 __swab32p(const __u32 *p)
> >       |                              ^~~~~~~~~
> > /usr/include/linux/swab.h:197:8: error: unknown type name '__always_inline'
> >   197 | static __always_inline __u64 __swab64p(const __u64 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/swab.h:197:30: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__swab64p'
> >   197 | static __always_inline __u64 __swab64p(const __u64 *p)
> >       |                              ^~~~~~~~~
> > /usr/include/linux/swab.h:252:23: error: expected ';' before 'void'
> >   252 | static __always_inline void __swab32s(__u32 *p)
> >       |                       ^~~~~
> >       |                       ;
> > /usr/include/linux/swab.h:265:23: error: expected ';' before 'void'
> >   265 | static __always_inline void __swab64s(__u64 *p)
> >       |                       ^~~~~
> >       |                       ;
> > In file included from /usr/include/asm/byteorder.h:5,
> >                  from /usr/src/linux-5.13.1-gentoo/tools/arch/x86/include/asm/insn.h:10,
> >                  from arch/x86/decode.c:10:
> > /usr/include/linux/byteorder/little_endian.h:44:8: error: unknown type name '__always_inline'
> >    44 | static __always_inline __le64 __cpu_to_le64p(const __u64 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:44:31: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__cpu_to_le64p'
> >    44 | static __always_inline __le64 __cpu_to_le64p(const __u64 *p)
> >       |                               ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:48:8: error: unknown type name '__always_inline'
> >    48 | static __always_inline __u64 __le64_to_cpup(const __le64 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:48:30: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__le64_to_cpup'
> >    48 | static __always_inline __u64 __le64_to_cpup(const __le64 *p)
> >       |                              ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:52:8: error: unknown type name '__always_inline'
> >    52 | static __always_inline __le32 __cpu_to_le32p(const __u32 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:52:31: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__cpu_to_le32p'
> >    52 | static __always_inline __le32 __cpu_to_le32p(const __u32 *p)
> >       |                               ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:56:8: error: unknown type name '__always_inline'
> >    56 | static __always_inline __u32 __le32_to_cpup(const __le32 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:56:30: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__le32_to_cpup'
> >    56 | static __always_inline __u32 __le32_to_cpup(const __le32 *p)
> >       |                              ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:60:8: error: unknown type name '__always_inline'
> >    60 | static __always_inline __le16 __cpu_to_le16p(const __u16 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:60:31: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__cpu_to_le16p'
> >    60 | static __always_inline __le16 __cpu_to_le16p(const __u16 *p)
> >       |                               ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:64:8: error: unknown type name '__always_inline'
> >    64 | static __always_inline __u16 __le16_to_cpup(const __le16 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:64:30: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__le16_to_cpup'
> >    64 | static __always_inline __u16 __le16_to_cpup(const __le16 *p)
> >       |                              ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:68:8: error: unknown type name '__always_inline'
> >    68 | static __always_inline __be64 __cpu_to_be64p(const __u64 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:68:31: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__cpu_to_be64p'
> >    68 | static __always_inline __be64 __cpu_to_be64p(const __u64 *p)
> >       |                               ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:72:8: error: unknown type name '__always_inline'
> >    72 | static __always_inline __u64 __be64_to_cpup(const __be64 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:72:30: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__be64_to_cpup'
> >    72 | static __always_inline __u64 __be64_to_cpup(const __be64 *p)
> >       |                              ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:76:8: error: unknown type name '__always_inline'
> >    76 | static __always_inline __be32 __cpu_to_be32p(const __u32 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:76:31: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__cpu_to_be32p'
> >    76 | static __always_inline __be32 __cpu_to_be32p(const __u32 *p)
> >       |                               ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:80:8: error: unknown type name '__always_inline'
> >    80 | static __always_inline __u32 __be32_to_cpup(const __be32 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:80:30: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__be32_to_cpup'
> >    80 | static __always_inline __u32 __be32_to_cpup(const __be32 *p)
> >       |                              ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:84:8: error: unknown type name '__always_inline'
> >    84 | static __always_inline __be16 __cpu_to_be16p(const __u16 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:84:31: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__cpu_to_be16p'
> >    84 | static __always_inline __be16 __cpu_to_be16p(const __u16 *p)
> >       |                               ^~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:88:8: error: unknown type name '__always_inline'
> >    88 | static __always_inline __u16 __be16_to_cpup(const __be16 *p)
> >       |        ^~~~~~~~~~~~~~~
> > /usr/include/linux/byteorder/little_endian.h:88:30: error: expected '=', ',', ';', 'asm' or '__attribute__' before '__be16_to_cpup'
> >    88 | static __always_inline __u16 __be16_to_cpup(const __be16 *p)
> >       |                              ^~~~~~~~~~~~~~
> > make[5]: *** [/usr/src/linux-5.13.1-gentoo/tools/build/Makefile.build:97: /var/tmp/portage/linux/tools/objtool/arch/x86/decode.o] Error 1
> > make[4]: *** [/usr/src/linux-5.13.1-gentoo/tools/build/Makefile.build:139: arch/x86] Error 2
> > make[4]: *** Waiting for unfinished jobs....
> > make[3]: *** [Makefile:56: /var/tmp/portage/linux/tools/objtool/objtool-in.o] Error 2
> > make[2]: *** [Makefile:69: objtool] Error 2
> > make[1]: *** [/usr/src/linux-5.13.1-gentoo/Makefile:1974: tools/objtool] Error 2
> > make[1]: Leaving directory '/var/tmp/portage/linux'
> > make: *** [Makefile:215: __sub-make] Error 2