mm/slob: use min_t() to compare ARCH_SLAB_MINALIGN

The definition of ARCH_SLAB_MINALIGN is architecture dependent
and can be either of type size_t or int. Comparing that value
with ARCH_KMALLOC_MINALIGN can cause harmless warnings on
platforms where they are different. Since both are always
small positive integer numbers, using the size_t type to compare
them is safe and gets rid of the warning.

Without this patch, building ARM collie_defconfig results in:

mm/slob.c: In function '__kmalloc_node':
mm/slob.c:431:152: warning: comparison of distinct pointer types lacks a cast [enabled by default]
mm/slob.c: In function 'kfree':
mm/slob.c:484:153: warning: comparison of distinct pointer types lacks a cast [enabled by default]
mm/slob.c: In function 'ksize':
mm/slob.c:503:153: warning: comparison of distinct pointer types lacks a cast [enabled by default]

Acked-by: Christoph Lameter <cl@linux.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
[ penberg@kernel.org: updates for master ]
Signed-off-by: Pekka Enberg <penberg@kernel.org>

1 files changed, 3 insertions, 3 deletions

diff --git a/mm/slob.c b/mm/slob.c
index e7d790127e4b..87e16c4d9143 100644
--- a/mm/slob.c
+++ b/mm/slob.c
@@ -428,7 +428,7 @@ static __always_inline void *
 __do_kmalloc_node(size_t size, gfp_t gfp, int node, unsigned long caller)
 {
         unsigned int *m;
-        int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
+        int align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
         void *ret;
 
         gfp &= gfp_allowed_mask;
@@ -496,7 +496,7 @@ void kfree(const void *block)
 
         sp = virt_to_page(block);
         if (PageSlab(sp)) {
-                int align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
+                int align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
                 unsigned int *m = (unsigned int *)(block - align);
                 slob_free(m, *m + align);
         } else
@@ -519,7 +519,7 @@ size_t ksize(const void *block)
         if (unlikely(!PageSlab(sp)))
                 return PAGE_SIZE << compound_order(sp);
 
-        align = max(ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
+        align = max_t(size_t, ARCH_KMALLOC_MINALIGN, ARCH_SLAB_MINALIGN);
         m = (unsigned int *)(block - align);
         return SLOB_UNITS(*m) * SLOB_UNIT;
 }