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powerpc/32s: Allow mapping with BATs with DEBUG_PAGEALLOC

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DEBUG_PAGEALLOC only manages RW data.

Text and RO data can still be mapped with BATs.

In order to map with BATs, also enforce data alignment. Set
by default to 256M which is a good compromise for keeping
enough BATs for also KASAN and IMMR.

Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/fd29c1718ee44d82115d0e835ced808eb4ccbf51.1589866984.git.christophe.leroy@csgroup.eu
This commit is contained in:
Christophe Leroy
2020-05-19 05:49:28 +00:00
committed by Michael Ellerman
parent a2feeb2c2e
commit 2b279c0348
3 changed files with 9 additions and 3 deletions
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5
arch/powerpc/mm/init_32.c
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@@ -99,10 +99,9 @@ static void __init MMU_setup(void)
if (IS_ENABLED(CONFIG_PPC_8xx))
return;
if (debug_pagealloc_enabled()) {
__map_without_bats = 1;
if (debug_pagealloc_enabled())
__map_without_ltlbs = 1;
}
if (strict_kernel_rwx_enabled())
__map_without_ltlbs = 1;
}