book3s64/hash: Early detect debug_pagealloc size requirement

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Add hash_supports_debug_pagealloc() helper to detect whether
debug_pagealloc can be supported on hash or not. This checks for both,
whether debug_pagealloc config is enabled and the linear map should
fit within rma_size/4 region size.

This can then be used early during htab_init_page_sizes() to decide
linear map pagesize if hash supports either debug_pagealloc or
kfence.

Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://patch.msgid.link/c33c6691b2a2cf619cc74ac100118ca4dbf21a48.1729271995.git.ritesh.list@gmail.com

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Ritesh Harjani (IBM) 2024-10-18 22:59:53 +05:30 • committed by Michael Ellerman

parent 76b7d6463f

commit 8846d96838

1 changed files with 13 additions and 12 deletions

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arch/powerpc/mm/book3s64/hash_utils.c

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