linux-kernel - Re: hppa vDSO and compiler (non-)support

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Date:   Thu, 24 Mar 2022 08:20:25 +0100
From:   Helge Deller <deller@....de>
To:     Guenter Roeck <linux@...ck-us.net>
Cc:     Jiri Slaby <jirislaby@...nel.org>, linux-parisc@...r.kernel.org,
        Linux kernel mailing list <linux-kernel@...r.kernel.org>,
        Martin Liška <mliska@...e.cz>,
        Andreas Schwab <schwab@...ux-m68k.org>
Subject: Re: hppa vDSO and compiler (non-)support

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/kernel/vdso32/restart_syscall.o] Error 1
>>>>> make[2]: *** Waiting for unfinished jobs....
>>>>> make[2]: *** [arch/parisc/kernel/vdso32/Makefile:34: arch/parisc/kernel/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=hppa-linux-  , e.g.:

make ARCH=parisc CROSS_COMPILE=hppa64-linux- CROSS32_COMPILE=hppa-linux-

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

make ARCH=parisc    -> 32bit kernel
make ARCH=parisc64  -> 64bit kernel

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

Helge