[PATCH] powerpc: fix pgtable pmd cache init
Nicholas Piggin
npiggin at gmail.com
Wed Jan 4 02:55:17 AEDT 2017
Commit 9b081e10805cd ("powerpc: port 64 bits pgtable_cache to 32 bits")
mixed up PMD_INDEX_SIZE and PMD_CACHE_INDEX a couple of times. This
resulted in 64s/hash/4k configs to panic at boot with a false positive
error check.
Fix that and simplify error handling by moving the check to the caller.
Fixes: 9b081e10805cd ("powerpc: port 64 bits pgtable_cache to 32 bits")
Cc: Christophe Leroy <christophe.leroy at c-s.fr>
Cc: Aneesh Kumar K.V <aneesh.kumar at linux.vnet.ibm.com>
Cc: Scott Wood <oss at buserror.net>
Cc: linuxppc-dev at lists.ozlabs.org
Signed-off-by: Nicholas Piggin <npiggin at gmail.com>
---
arch/powerpc/mm/hugetlbpage.c | 6 +-----
arch/powerpc/mm/init-common.c | 11 +++--------
2 files changed, 4 insertions(+), 13 deletions(-)
diff --git a/arch/powerpc/mm/hugetlbpage.c b/arch/powerpc/mm/hugetlbpage.c
index 289df38fb7e0..f21f6b907d99 100644
--- a/arch/powerpc/mm/hugetlbpage.c
+++ b/arch/powerpc/mm/hugetlbpage.c
@@ -810,12 +810,8 @@ static int __init hugetlbpage_init(void)
* if we have pdshift and shift value same, we don't
* use pgt cache for hugepd.
*/
- if (pdshift > shift) {
+ if (pdshift > shift)
pgtable_cache_add(pdshift - shift, NULL);
- if (!PGT_CACHE(pdshift - shift))
- panic("hugetlbpage_init(): could not create "
- "pgtable cache for %d bit pagesize\n", shift);
- }
#if defined(CONFIG_PPC_FSL_BOOK3E) || defined(CONFIG_PPC_8xx)
else if (!hugepte_cache) {
/*
diff --git a/arch/powerpc/mm/init-common.c b/arch/powerpc/mm/init-common.c
index a175cd82ae8c..1a3be5ae1d07 100644
--- a/arch/powerpc/mm/init-common.c
+++ b/arch/powerpc/mm/init-common.c
@@ -80,6 +80,8 @@ void pgtable_cache_add(unsigned shift, void (*ctor)(void *))
new = kmem_cache_create(name, table_size, align, 0, ctor);
kfree(name);
pgtable_cache[shift - 1] = new;
+ if (!new)
+ panic("Could not allocate pgtable cache for order %d", shift);
pr_debug("Allocated pgtable cache for order %d\n", shift);
}
@@ -88,7 +90,7 @@ void pgtable_cache_init(void)
{
pgtable_cache_add(PGD_INDEX_SIZE, pgd_ctor);
- if (PMD_INDEX_SIZE && !PGT_CACHE(PMD_INDEX_SIZE))
+ if (PMD_CACHE_INDEX && !PGT_CACHE(PMD_CACHE_INDEX))
pgtable_cache_add(PMD_CACHE_INDEX, pmd_ctor);
/*
* In all current configs, when the PUD index exists it's the
@@ -97,11 +99,4 @@ void pgtable_cache_init(void)
*/
if (PUD_INDEX_SIZE && !PGT_CACHE(PUD_INDEX_SIZE))
pgtable_cache_add(PUD_INDEX_SIZE, pud_ctor);
-
- if (!PGT_CACHE(PGD_INDEX_SIZE))
- panic("Couldn't allocate pgd cache");
- if (PMD_INDEX_SIZE && !PGT_CACHE(PMD_INDEX_SIZE))
- panic("Couldn't allocate pmd pgtable caches");
- if (PUD_INDEX_SIZE && !PGT_CACHE(PUD_INDEX_SIZE))
- panic("Couldn't allocate pud pgtable caches");
}
--
2.11.0
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