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linux/arch/powerpc/include
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Ben Hutchings 8bc0868998 powerpc/mm: Only define MAX_PHYSMEM_BITS in SPARSEMEM configurations 
MAX_PHYSMEM_BITS only needs to be defined if CONFIG_SPARSEMEM is
enabled, and that was the case before commit 4ffe713b75
("powerpc/mm: Increase the max addressable memory to 2PB").

On 32-bit systems, where CONFIG_SPARSEMEM is not enabled, we now
define it as 46.  That is larger than the real number of physical
address bits, and breaks calculations in zsmalloc:

  mm/zsmalloc.c:130:49: warning: right shift count is negative
    MAX(32, (ZS_MAX_PAGES_PER_ZSPAGE << PAGE_SHIFT >> OBJ_INDEX_BITS))
                                                   ^~
  ...
  mm/zsmalloc.c:253:21: error: variably modified 'size_class' at file scope
    struct size_class *size_class[ZS_SIZE_CLASSES];
                       ^~~~~~~~~~

Fixes: 4ffe713b75 ("powerpc/mm: Increase the max addressable memory to 2PB")
Cc: stable@vger.kernel.org # v4.20+
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
History 2019-03-21 00:16:45 +11:00
..
asm powerpc/mm: Only define MAX_PHYSMEM_BITS in SPARSEMEM configurations 2019-03-21 00:16:45 +11:00
uapi/asm Kbuild updates for v5.1 (2nd) 2019-03-17 13:25:26 -07:00