From 8a965b3baa89ffedc73c0fbc750006c631012ced Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Fri, 3 May 2013 18:04:18 +0000 Subject: [PATCH] mm, slab_common: Fix bootstrap creation of kmalloc caches For SLAB the kmalloc caches must be created in ascending sizes in order for the OFF_SLAB sub-slab cache to work properly. Create the non power of two caches immediately after the prior power of two kmalloc cache. Do not create the non power of two caches before all other caches. Reported-and-tested-by: Tetsuo Handa Signed-off-by: Christoph Lamete Link: http://lkml.kernel.org/r/201305040348.CIF81716.OStQOHFJMFLOVF@I-love.SAKURA.ne.jp Signed-off-by: Pekka Enberg --- mm/slab_common.c | 24 +++++++++++++++--------- 1 file changed, 15 insertions(+), 9 deletions(-) diff --git a/mm/slab_common.c b/mm/slab_common.c index c5d352e73d81..d2517b05d5bc 100644 --- a/mm/slab_common.c +++ b/mm/slab_common.c @@ -442,18 +442,24 @@ void __init create_kmalloc_caches(unsigned long flags) for (i = 128 + 8; i <= 192; i += 8) size_index[size_index_elem(i)] = 8; } - /* Caches that are not of the two-to-the-power-of size */ - if (KMALLOC_MIN_SIZE <= 32 && !kmalloc_caches[1]) - kmalloc_caches[1] = create_kmalloc_cache(NULL, 96, flags); - - if (KMALLOC_MIN_SIZE <= 64 && !kmalloc_caches[2]) - kmalloc_caches[2] = create_kmalloc_cache(NULL, 192, flags); - - for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) - if (!kmalloc_caches[i]) + for (i = KMALLOC_SHIFT_LOW; i <= KMALLOC_SHIFT_HIGH; i++) { + if (!kmalloc_caches[i]) { kmalloc_caches[i] = create_kmalloc_cache(NULL, 1 << i, flags); + /* + * 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 (KMALLOC_MIN_SIZE <= 32 && !kmalloc_caches[1] && i == 6) + kmalloc_caches[1] = create_kmalloc_cache(NULL, 96, flags); + + if (KMALLOC_MIN_SIZE <= 64 && !kmalloc_caches[2] && i == 7) + kmalloc_caches[2] = create_kmalloc_cache(NULL, 192, flags); + } + } + /* Kmalloc array is now usable */ slab_state = UP; -- 2.30.2