[v2] powerpc/32s: fix boot failure with DEBUG_PAGEALLOC without KASAN.
diff mbox series

Message ID b7860c5e1e784d6b96ba67edf47dd6cbc2e78ab6.1565776892.git.christophe.leroy@c-s.fr
State New
Headers show
Series
  • [v2] powerpc/32s: fix boot failure with DEBUG_PAGEALLOC without KASAN.
Related show

Checks

Context Check Description
snowpatch_ozlabs/checkpatch success total: 0 errors, 0 warnings, 0 checks, 26 lines checked
snowpatch_ozlabs/build-pmac32 success Build succeeded
snowpatch_ozlabs/build-ppc64e success Build succeeded
snowpatch_ozlabs/build-ppc64be success Build succeeded
snowpatch_ozlabs/build-ppc64le success Build succeeded
snowpatch_ozlabs/apply_patch success Successfully applied on branch next (da206bd46848568e1aaf35f00e2d78bf9bc94f95)

Commit Message

Christophe Leroy Aug. 14, 2019, 10:02 a.m. UTC
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.

Reported-by: Jonathan Neuschafer <j.neuschaefer@gmx.net>
Fixes: 72f208c6a8f7 ("powerpc/32s: move hash code patching out of MMU_init_hw()")
Tested-by: Jonathan Neuschafer <j.neuschaefer@gmx.net>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
---
 v2: Added a comment in MMU_init_hw()

 arch/powerpc/kernel/head_32.S  | 2 ++
 arch/powerpc/mm/book3s32/mmu.c | 9 +++++++++
 2 files changed, 11 insertions(+)

Patch
diff mbox series

diff --git a/arch/powerpc/kernel/head_32.S b/arch/powerpc/kernel/head_32.S
index f255e22184b4..c8b4f7ed318c 100644
--- a/arch/powerpc/kernel/head_32.S
+++ b/arch/powerpc/kernel/head_32.S
@@ -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
diff --git a/arch/powerpc/mm/book3s32/mmu.c b/arch/powerpc/mm/book3s32/mmu.c
index e249fbf6b9c3..8d68f03bf5a4 100644
--- a/arch/powerpc/mm/book3s32/mmu.c
+++ b/arch/powerpc/mm/book3s32/mmu.c
@@ -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)