[PATCH 5.8 33/38] powerpc/kasan: Fix shadow pages allocation failure

[Greg Kroah-Hartman]

From: Christophe Leroy <christophe.le...@csgroup.eu>

commit 41ea93cf7ba4e0f0cc46ebfdda8b6ff27c67bc91 upstream.

Doing kasan pages allocation in MMU_init is too early, kernel doesn't
have access yet to the entire memory space and memblock_alloc() fails
when the kernel is a bit big.

Do it from kasan_init() instead.

Fixes: 2edb16efc899 ("powerpc/32: Add KASAN support")
Fixes: d2a91cef9bbd ("powerpc/kasan: Fix shadow pages allocation failure")
Cc: sta...@vger.kernel.org
Reported-by: Erhard F. <erhar...@mailbox.org>
Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
Signed-off-by: Michael Ellerman <m...@ellerman.id.au>
Link: https://bugzilla.kernel.org/show_bug.cgi?id=208181
Link: 
https://lore.kernel.org/r/63048fcea8a1c02f75429ba3152f80f7853f87fc.1593690707.git.christophe.le...@csgroup.eu
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>

---
 arch/powerpc/mm/kasan/kasan_init_32.c |   25 +++++++++++++------------
 1 file changed, 13 insertions(+), 12 deletions(-)

--- a/arch/powerpc/mm/kasan/kasan_init_32.c
+++ b/arch/powerpc/mm/kasan/kasan_init_32.c
@@ -120,11 +120,24 @@ static void __init kasan_unmap_early_sha
 void __init kasan_mmu_init(void)
 {
        int ret;
+
+       if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE) ||
+           IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
+               ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, 
KASAN_SHADOW_END);
+
+               if (ret)
+                       panic("kasan: kasan_init_shadow_page_tables() failed");
+       }
+}
+
+void __init kasan_init(void)
+{
        struct memblock_region *reg;
 
        for_each_memblock(memory, reg) {
                phys_addr_t base = reg->base;
                phys_addr_t top = min(base + reg->size, total_lowmem);
+               int ret;
 
                if (base >= top)
                        continue;
@@ -134,18 +147,6 @@ void __init kasan_mmu_init(void)
                        panic("kasan: kasan_init_region() failed");
        }
 
-       if (early_mmu_has_feature(MMU_FTR_HPTE_TABLE) ||
-           IS_ENABLED(CONFIG_KASAN_VMALLOC)) {
-               ret = kasan_init_shadow_page_tables(KASAN_SHADOW_START, 
KASAN_SHADOW_END);
-
-               if (ret)
-                       panic("kasan: kasan_init_shadow_page_tables() failed");
-       }
-
-}
-
-void __init kasan_init(void)
-{
        kasan_remap_early_shadow_ro();
 
        clear_page(kasan_early_shadow_page);