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powerpc/64: Make VDSO32 track COMPAT on 64-bit

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When we added the VDSO32 kconfig symbol, which controls building of
the 32-bit VDSO, we made it depend on CPU_BIG_ENDIAN (for 64-bit).

That was because back then COMPAT was always enabled for 64-bit, so
depending on it would have left the 32-bit VDSO always enabled, which
we didn't want.

But since then we have made COMPAT selectable, and off by default for
ppc64le, so VDSO32 should really depend on that.

For most people this makes no difference, none of the defconfigs
change, it's only if someone is building ppc64le with COMPAT=y, they
will now also get VDSO32. If they've enabled COMPAT in order to run
32-bit binaries they presumably also want the 32-bit VDSO.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Reviewed-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/20200908125850.407939-1-mpe@ellerman.id.au
This commit is contained in:
Michael Ellerman 2020-08-27 23:17:13 +10:00
parent 960e370813
commit 231b232df8
1 changed files with 3 additions and 4 deletions
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7
arch/powerpc/platforms/Kconfig.cputype
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@ -490,13 +490,12 @@ endmenu
config VDSO32
def_bool y
depends on PPC32 || CPU_BIG_ENDIAN
depends on PPC32 || COMPAT
help
This symbol controls whether we build the 32-bit VDSO. We obviously
want to do that if we're building a 32-bit kernel. If we're building
a 64-bit kernel then we only want a 32-bit VDSO if we're building for
big endian. That is because the only little endian configuration we
support is ppc64le which is 64-bit only.
a 64-bit kernel then we only want a 32-bit VDSO if we're also enabling
COMPAT.
choice
prompt "Endianness selection"