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powerpc/mm/slice: Enhance for supporting PPC32

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In preparation for the following patch which will fix an issue on
the 8xx by re-using the 'slices', this patch enhances the
'slices' implementation to support 32 bits CPUs.

On PPC32, the address space is limited to 4Gbytes, hence only the low
slices will be used.

The high slices use bitmaps. As bitmap functions are not prepared to
handle bitmaps of size 0, this patch ensures that bitmap functions
are called only when SLICE_NUM_HIGH is not nul.

Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Reviewed-by: Nicholas Piggin <npiggin@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
This commit is contained in:
Christophe Leroy
2018-02-22 15:27:24 +01:00
committed by Michael Ellerman
parent a3286f05bc
commit db3a528db4
3 changed files with 50 additions and 9 deletions
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4
arch/powerpc/include/asm/slice.h
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@@ -4,8 +4,10 @@
#ifdef CONFIG_PPC_BOOK3S_64
#include <asm/book3s/64/slice.h>
#else
#elif defined(CONFIG_PPC64)
#include <asm/nohash/64/slice.h>
#elif defined(CONFIG_PPC_MMU_NOHASH)
#include <asm/nohash/32/slice.h>
#endif
#ifdef CONFIG_PPC_MM_SLICES