Re: Build regressions/improvements in v6.0-rc5

[Helge Deller]

On 9/20/22 23:07, Helge Deller wrote:
> On 9/20/22 22:29, Randy Dunlap wrote:
> > On 9/20/22 13:23, Helge Deller wrote:
> > > On 9/12/22 11:22, Geert Uytterhoeven wrote:
> > > > On Mon, 12 Sep 2022, Geert Uytterhoeven wrote:
> > > > > JFYI, when comparing v6.0-rc5[1] to v6.0-rc4[3], the summaries are:
> > > > >   - build errors: +16/-1
> > > >
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/restart_syscall.S: Error: .cfi_endproc without corresponding .cfi_startproc:  => 32
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/restart_syscall.S: Error: bad or irreducible absolute expression:  => 16
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/restart_syscall.S: Error: junk at end of line, first unrecognized character is `:':  => 16
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/restart_syscall.S: Error: no such instruction: `be 0x100(%sr2,%r0)':  => 29
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/restart_syscall.S: Error: no such instruction: `ldi 0,%r20':  => 30
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/restart_syscall.S: Error: no such instruction: `ldw 0(%sp),%r31':  => 26
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/sigtramp.S: Error: no such instruction: `ble 0x100(%sr2,%r0)':  => 46, 51
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/sigtramp.S: Error: no such instruction: `ldi 0,%r25':  => 44
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/sigtramp.S: Error: no such instruction: `ldi 1,%r25':  => 49
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/sigtramp.S: Error: no such instruction: `ldi 173,%r20':  => 45, 50
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/sigtramp.S: Error: unknown pseudo-op: `.callinfo':  => 40
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/sigtramp.S: Error: unknown pseudo-op: `.entry':  => 41
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/sigtramp.S: Error: unknown pseudo-op: `.exit':  => 54
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/sigtramp.S: Error: unknown pseudo-op: `.proc':  => 39
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/sigtramp.S: Error: unknown pseudo-op: `.procend':  => 55
> > > >     + /kisskb/src/arch/parisc/kernel/vdso32/sigtramp.S: Error: unknown pseudo-op: `.stringz':  => 76
> > > >
> > > > parisc-gcc8/generic-32bit_defconfig
> > > >
> > > > > [1] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/80e78fcce86de0288793a0ef0f6acf37656ee4cf/ (all 135 configs)
> > > > > [3] http://kisskb.ellerman.id.au/kisskb/branch/linus/head/7e18e42e4b280c85b76967a9106a13ca61c16179/ (all 135 configs)
> > >
> > > I see those errors on the kiss website, but I'm unable to reproduce them.
> > > Downloaded that .config, used same compiler (from https://mirrors.edge.kernel.org/pub/tools/crosstool/files/bin/x86_64/8.5.0/)....
> > > Not sure how to get this fixed.
> > > If someone has an idea or can reproduce, please let me know.
> >
> > Hi,
> > I can reproduce it using the (x86_64 hosted) crosstool gcc-12.1.0 from kernel.org that Arnd builds/provides.
> > https://mirrors.edge.kernel.org/pub/tools/crosstool/
>
> Ah....
> Building with "make  ARCH=parisc  CROSS_COMPILE=/some/path/nolibc/hppa-linux/bin/hppa-linux-"
> uses this CROSS_COMPILE prefix for compiling the .c files, but not for the .S files.
> So, you will end up with the default hppa-linux-gcc installed on the system, not the one provided
> by CROSS_COMPILE.

Ok, it seems CROSS_COMPILE doesn't work as one would expect (and as it did in the past).
I'm not sure if this can be fixed.

Since kernel v5.18 the parisc kernel comes with a 32-bit and a 64-bit vDSO.
On parisc we have two compilers:
- hppa-linux-gnu-gcc for 32-bit, and
- hppa64-linux-gnu-gcc for 64-bit code.
There is no -m64 flag like on x86 which can be used to just use one compiler for both targets.
If you provide a CROSS_COMPILE command, you can only provide either a 32- or 64-bit compiler,
so e.g. you won't be able to build the 64-bit kernel and a 32-bit vDSO with the same compiler.

Instead of using CROSS_COMPILE, please just install your compiler(s) and make sure that
the compiler(s) can be found via the PATH environment variable.
In arch/parisc/Makefile (line 42ff) various variants like hppa-linux-gnu-gcc or
hppa1.1-unknown-linux-gnu-gcc will be searched.

So, instead of
 make ARCH=parisc CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/hppa-linux/bin/hppa-linux-
please use for 32-bit:
 PATH=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/hppa-linux/bin/:$PATH     make ARCH=parisc
or for 64-bit:
 PATH=/opt/cross/kisskb/korg/gcc-8.5.0-nolibc/hppa64-linux/bin/:$PATH   make ARCH=parisc64

I haven't yet checked how other platforms do it, but I'm open for any suggestions
how this could be made easier.

Helge