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authorKirill A. Shutemov <kirill.shutemov@linux.intel.com>2023-03-15 14:31:33 +0300
committerAndrew Morton <akpm@linux-foundation.org>2023-04-05 19:42:46 -0700
commit23baf831a32c04f9a968812511540b1b3e648bf5 (patch)
treefcaca52cefbef2707710ce057f58fb1c955a0559 /mm/slab.c
parent61883d3c32418f16e35e030ca0cfd5d2de95a649 (diff)
mm, treewide: redefine MAX_ORDER sanely
MAX_ORDER currently defined as number of orders page allocator supports: user can ask buddy allocator for page order between 0 and MAX_ORDER-1. This definition is counter-intuitive and lead to number of bugs all over the kernel. Change the definition of MAX_ORDER to be inclusive: the range of orders user can ask from buddy allocator is 0..MAX_ORDER now. [kirill@shutemov.name: fix min() warning] Link: https://lkml.kernel.org/r/20230315153800.32wib3n5rickolvh@box [akpm@linux-foundation.org: fix another min_t warning] [kirill@shutemov.name: fixups per Zi Yan] Link: https://lkml.kernel.org/r/20230316232144.b7ic4cif4kjiabws@box.shutemov.name [akpm@linux-foundation.org: fix underlining in docs] Link: https://lore.kernel.org/oe-kbuild-all/202303191025.VRCTk6mP-lkp@intel.com/ Link: https://lkml.kernel.org/r/20230315113133.11326-11-kirill.shutemov@linux.intel.com Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com> Reviewed-by: Michael Ellerman <mpe@ellerman.id.au> [powerpc] Cc: "Kirill A. Shutemov" <kirill@shutemov.name> Cc: Zi Yan <ziy@nvidia.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Diffstat (limited to 'mm/slab.c')
-rw-r--r--mm/slab.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/slab.c b/mm/slab.c
index edbe722fb906..6b7c172158e5 100644
--- a/mm/slab.c
+++ b/mm/slab.c
@@ -465,7 +465,7 @@ static int __init slab_max_order_setup(char *str)
{
get_option(&str, &slab_max_order);
slab_max_order = slab_max_order < 0 ? 0 :
- min(slab_max_order, MAX_ORDER - 1);
+ min(slab_max_order, MAX_ORDER);
slab_max_order_set = true;
return 1;