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authorChristoph Lameter <cl@linux.com>2015-06-29 09:28:08 -0500
committerLinus Torvalds <torvalds@linux-foundation.org>2015-06-29 10:49:51 -0700
commita9730fca9946f3697410479e0ef1bd759ba00a77 (patch)
tree0708dfc873d6df1e7df1ce7cd6575f19cd8b5ed0 /mm/slab_common.c
parent88793e5c774ec69351ef6b5200bb59f532e41bca (diff)
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Fix kmalloc slab creation sequence
This patch restores the slab creation sequence that was broken by commit 4066c33d0308f8 and also reverts the portions that introduced the KMALLOC_LOOP_XXX macros. Those can never really work since the slab creation is much more complex than just going from a minimum to a maximum number. The latest upstream kernel boots cleanly on my machine with a 64 bit x86 configuration under KVM using either SLAB or SLUB. Fixes: 4066c33d0308f8 ("support the slub_debug boot option") Reported-by: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Christoph Lameter <cl@linux.com> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/slab_common.c')
-rw-r--r--mm/slab_common.c32
1 files changed, 16 insertions, 16 deletions
diff --git a/mm/slab_common.c b/mm/slab_common.c
index 9f8d71f78404..983b78694c46 100644
--- a/mm/slab_common.c
+++ b/mm/slab_common.c
@@ -855,6 +855,12 @@ void __init setup_kmalloc_cache_index_table(void)
}
}
+static void new_kmalloc_cache(int idx, unsigned long flags)
+{
+ kmalloc_caches[idx] = create_kmalloc_cache(kmalloc_info[idx].name,
+ kmalloc_info[idx].size, flags);
+}
+
/*
* Create the kmalloc array. Some of the regular kmalloc arrays
* may already have been created because they were needed to
@@ -864,25 +870,19 @@ void __init create_kmalloc_caches(unsigned long flags)
{
int i;
- for (i = KMALLOC_LOOP_LOW; i <= KMALLOC_SHIFT_HIGH; i++) {
- if (!kmalloc_caches[i]) {
- kmalloc_caches[i] = create_kmalloc_cache(
- kmalloc_info[i].name,
- kmalloc_info[i].size,
- flags);
- }
+ for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) {
+ if (!kmalloc_caches[i])
+ new_kmalloc_cache(i, flags);
/*
- * "i == 2" is the "kmalloc-192" case which is the last special
- * case for initialization and it's the point to jump to
- * allocate the minimize size of the object. In slab allocator,
- * the KMALLOC_SHIFT_LOW = 5. So, it needs to skip 2^3 and 2^4
- * and go straight to allocate 2^5. If the ARCH_DMA_MINALIGN is
- * defined, it may be larger than 2^5 and here is also the
- * trick to skip the empty gap.
+ * Caches that are not of the two-to-the-power-of size.
+ * These have to be created immediately after the
+ * earlier power of two caches
*/
- if (i == 2)
- i = (KMALLOC_SHIFT_LOW - 1);
+ if (KMALLOC_MIN_SIZE <= 32 && !kmalloc_caches[1] && i == 6)
+ new_kmalloc_cache(1, flags);
+ if (KMALLOC_MIN_SIZE <= 64 && !kmalloc_caches[2] && i == 7)
+ new_kmalloc_cache(2, flags);
}
/* Kmalloc array is now usable */