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Subject[patch] slab: always follow arch requested alignments
From: Heiko Carstens <heiko.carstens@de.ibm.com>

In kmem_cache_create(): always check if BYTES_PER_WORD is less than
ARCH_SLAB_MINALIGN and disable debug options that would set the
alignment to BYTES_PER_WORD.
This will make sure that all slab caches will have at least an
ARCH_SLAB_MINALIGN alignment.

In addition make sure that a caller mandated align which is greater
than BYTES_PER_WORD also disables the same debug options.
This makes sure that ARCH_KMALLOC_MINALIGN also has an effect if
CONFIG_DEBUG_SLAB is set.

Cc: Christoph Lameter <clameter@sgi.com>
Signed-off-by: Heiko Carstens <heiko.carstens@de.ibm.com>
---
mm/slab.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/mm/slab.c b/mm/slab.c
index 0f20843..1f6fc04 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -2103,12 +2103,18 @@ #endif
if (ralign > BYTES_PER_WORD)
flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
}
+ if (BYTES_PER_WORD < ARCH_SLAB_MINALIGN)
+ flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
+
/* 3) caller mandated alignment: disables debug if necessary */
if (ralign < align) {
ralign = align;
if (ralign > BYTES_PER_WORD)
flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
}
+ if (align > BYTES_PER_WORD)
+ flags &= ~(SLAB_RED_ZONE | SLAB_STORE_USER);
+
/*
* 4) Store it. Note that the debug code below can reduce
* the alignment to BYTES_PER_WORD.
-
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