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Date:   Thu, 24 Mar 2022 08:20:25 +0100
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Subject: Re: hppa vDSO and compiler (non-)support
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To:     Guenter Roeck <linux@roeck-us.net>
Cc:     Jiri Slaby <jirislaby@kernel.org>, linux-parisc@vger.kernel.org,
        Linux kernel mailing list <linux-kernel@vger.kernel.org>,
        =?UTF-8?Q?Martin_Li=c5=a1ka?= <mliska@suse.cz>,
        Andreas Schwab <schwab@linux-m68k.org>
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From:   Helge Deller <deller@gmx.de>
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On 3/22/22 18:50, Guenter Roeck wrote:
>>>>> Building parisc64:generic-64bit_defconfig ... failed
>>>>> --------------
>>>>> Error log:
>>>>> arch/parisc/kernel/vdso64/Makefile:30: FORCE prerequisite is missing
>>>>> arch/parisc/kernel/vdso32/sigtramp.S: Assembler messages:
>>>>> arch/parisc/kernel/vdso32/sigtramp.S:39: Error: unknown pseudo-op: `=
.proc'
>>>>> ...
>>>>> arch/parisc/kernel/vdso32/restart_syscall.S:32: Error: .cfi_endproc =
without corresponding .cfi_startproc
>>>>> make[2]: *** [arch/parisc/kernel/vdso32/Makefile:34: arch/parisc/ker=
nel/vdso32/restart_syscall.o] Error 1
>>>>> make[2]: *** Waiting for unfinished jobs....
>>>>> make[2]: *** [arch/parisc/kernel/vdso32/Makefile:34: arch/parisc/ker=
nel/vdso32/sigtramp.o] Error 1
>>>>> make[1]: *** [arch/parisc/Makefile:177: vdso_prepare] Error 2
>>>>> make: *** [Makefile:219: __sub-make] Error 2

To recap - the solution was to add CROSS32_COMPILE=3Dhppa-linux-  , e.g.:

make ARCH=3Dparisc CROSS_COMPILE=3Dhppa64-linux- CROSS32_COMPILE=3Dhppa-li=
nux-

The better solution (for kernel >=3D v5.17) is to simply leave out the CRO=
SS_COMPILE/CROSS32_COMPILE
parameters and let the Makefile autodetect everything:

make ARCH=3Dparisc    -> 32bit kernel
make ARCH=3Dparisc64  -> 64bit kernel

It's now documented in the Wiki:
https://parisc.wiki.kernel.org/index.php/Cross_compiler_toolchain#How_to_b=
uild_the_kernel

Helge