powerpc/mm: Add a CONFIG option to choose if radix is used by default

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Currently if the hardware supports the radix MMU we will use
it, *unless* "disable_radix" is passed on the kernel command line.

However some users would like the reverse semantics. ie. The kernel
uses the hash MMU by default, unless radix is explicitly requested on
the command line.

So add a CONFIG option to choose whether we use radix by default or
not, and expand the disable_radix command line option to allow
"disable_radix=no" which *enables* radix.

Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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This commit is contained in:

Michael Ellerman 2017-10-24 17:48:49 +02:00

parent 4e00374704

commit 1fd6c02207

2 changed files with 24 additions and 2 deletions

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13

arch/powerpc/mm/init_64.c

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13

arch/powerpc/platforms/Kconfig.cputype

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