Re: Unknown __always_inline in linux/swab.h

From: Khem Raj
Date: Fri Jul 16 2021 - 11:42:29 EST

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On Fri, Jul 16, 2021 at 7:27 AM Petr Vaněk <arkamar@xxxxxxxx> 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@xxxxxxxxx/
work for you ?
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@xxxxxxxxxx/
> [3] https://lore.kernel.org/lkml/1514973450-12447-1-git-send-email-matt.redfearn@xxxxxxxx/
> [4] https://lore.kernel.org/lkml/20181213180129.1373-1-raj.khem@xxxxxxxxx/
> [5] https://lore.kernel.org/lkml/20201210144844.72580-1-chanho61.park@xxxxxxxxxxx/
> [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

Next message: Lad, Prabhakar: "Re: [PATCH 1/2] dt-bindings: iio: adc: Add binding documentation for Renesas RZ/G2L A/D converter"
Previous message: Greg KH: "Re: MTD: How to get actual image size from MTD partition"
In reply to: Petr Vaněk: "Unknown __always_inline in linux/swab.h"
Next in thread: Petr Vaněk: "Re: Unknown __always_inline in linux/swab.h"
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