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powerpc/32s: Fix boot failure with DEBUG_PAGEALLOC without KASAN. 

When KASAN is selected, the definitive hash table has to be
set up later, but there is already an early temporary one.

When KASAN is not selected, there is no early hash table,
so the setup of the definitive hash table cannot be delayed.

Fixes: 72f208c6a8 ("powerpc/32s: move hash code patching out of MMU_init_hw()")
Cc: stable@vger.kernel.org # v5.2+
Reported-by: Jonathan Neuschafer <j.neuschaefer@gmx.net>
Tested-by: Jonathan Neuschafer <j.neuschaefer@gmx.net>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/b7860c5e1e784d6b96ba67edf47dd6cbc2e78ab6.1565776892.git.christophe.leroy@c-s.fr
This commit is contained in:
Christophe Leroy 2019-08-14 10:02:20 +00:00 committed by Michael Ellerman
parent 38a0d0cdb4
commit 9d6d712fbf
2 changed files with 11 additions and 0 deletions
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2
arch/powerpc/kernel/head_32.S
View File

@ -897,9 +897,11 @@ start_here:
bl machine_init
bl __save_cpu_setup
bl MMU_init
#ifdef CONFIG_KASAN
BEGIN_MMU_FTR_SECTION
bl MMU_init_hw_patch
END_MMU_FTR_SECTION_IFSET(MMU_FTR_HPTE_TABLE)
#endif
/*
* Go back to running unmapped so we can load up new values

9
arch/powerpc/mm/book3s32/mmu.c
View File

@ -358,6 +358,15 @@ void __init MMU_init_hw(void)
hash_mb2 = hash_mb = 32 - LG_HPTEG_SIZE - lg_n_hpteg;
if (lg_n_hpteg > 16)
hash_mb2 = 16 - LG_HPTEG_SIZE;
/*
* When KASAN is selected, there is already an early temporary hash
* table and the switch to the final hash table is done later.
*/
if (IS_ENABLED(CONFIG_KASAN))
return;
MMU_init_hw_patch();
}
void __init MMU_init_hw_patch(void)