linux-kernel - Re: Build regressions/improvements in v5.7-rc1

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Date:   Tue, 14 Apr 2020 13:19:03 +0200
From:   Krzysztof Kozlowski <krzk@...nel.org>
To:     Michael Ellerman <mpe@...erman.id.au>
Cc:     Geert Uytterhoeven <geert@...ux-m68k.org>,
        linux-kernel@...r.kernel.org, linuxppc-dev@...ts.ozlabs.org,
        netdev@...r.kernel.org, virtualization@...ts.linux-foundation.org
Subject: Re: Build regressions/improvements in v5.7-rc1

On Tue, Apr 14, 2020 at 01:06:27PM +0200, Krzysztof Kozlowski wrote:
> On Tue, Apr 14, 2020 at 08:23:32PM +1000, Michael Ellerman wrote:
 > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/64/pgtable-4k.h: error: expected ')' before '!=' token:  => 58:40
> > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/64/pgtable-4k.h: error: expected ')' before '==' token:  => 57:37
> > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/64/pgtable-4k.h: error: expected identifier or '(' before '!' token:  => 56:25
> > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/64/pgtable.h: error: expected ')' before '!=' token:  => 163:40
> > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/64/pgtable.h: error: expected ')' before '==' token:  => 333:50
> > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/64/pgtable.h: error: expected ')' before '^' token:  => 333:36
> > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/64/pgtable.h: error: expected identifier or '(' before '!' token:  => 146:27, 144:24, 160:25, 161:24, 143:25
> > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/64/pgtable.h: error: expected identifier or '(' before 'struct':  => 77:21
> > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/pgtable.h: error: redefinition of 'pgd_huge':  => 291:19
> > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/pte-book3e.h: error: redefinition of 'pte_mkprivileged':  => 108:26
> > >>  + /kisskb/src/arch/powerpc/include/asm/nohash/pte-book3e.h: error: redefinition of 'pte_mkuser':  => 115:20
> > >>  + /kisskb/src/arch/powerpc/kvm/book3s_64_vio_hv.c: error: 'struct kvm_arch' has no member named 'spapr_tce_tables':  => 68:46, 68:2
> > >
> > > ppc64_book3e_allmodconfig
> > 
> > Caused by:
> > 
> > e93a1695d7fb ("iommu: Enable compile testing for some of drivers")
> > 
> > Which did:
> > 
> >  config SPAPR_TCE_IOMMU
> >  	bool "sPAPR TCE IOMMU Support"
> > -	depends on PPC_POWERNV || PPC_PSERIES
> > +	depends on PPC_POWERNV || PPC_PSERIES || (PPC && COMPILE_TEST)
> > 
> > 
> > Which is just ... not right, the dependencies on the correct platform
> > are important, otherwise the build breaks.
> 
> The SPAPR_TCE_IOMMU should compile fine.  The actual trouble here is
> that KVM_BOOK3S_64 selects SPAPR_TCE_IOMMU which is a user-visible
> symbol.  This is generally discouraged because of exactly this error -
> select ignores any dependencies.
> 
> I can revert the COMPILE_TEST for SPAPR_TCE_IOMMU or change
> select->depends in KVM_BOOK3S_64.  I think the latter is the proper
> change here.

Eh, not really, it looks more complex because there are more
dependencies (the book3s_64_vio_hv is pulled by KVM Makefile if
SPAPR_TCE_IOMMU is set).

I guess the revert of this part makes most sense.

Best regards,
Krzysztof