[PATCH] mm/cma: silence warnings due to max() usage

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[PATCH] mm/cma: silence warnings due to max() usage

Stephen Rothwell
pageblock_order can be (at least) an unsigned int or an unsigned long
depending on the kernel config and architecture, so use max_t(unsigned
long, ...) when comparing it.

fixes these warnings:

In file included from include/asm-generic/bug.h:13:0,
                 from arch/powerpc/include/asm/bug.h:127,
                 from include/linux/bug.h:4,
                 from include/linux/mmdebug.h:4,
                 from include/linux/mm.h:8,
                 from include/linux/memblock.h:18,
                 from mm/cma.c:28:
mm/cma.c: In function 'cma_init_reserved_mem':
include/linux/kernel.h:748:17: warning: comparison of distinct pointer types lacks a cast
  (void) (&_max1 == &_max2);  \
                 ^
mm/cma.c:186:27: note: in expansion of macro 'max'
  alignment = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
                           ^
mm/cma.c: In function 'cma_declare_contiguous':
include/linux/kernel.h:748:17: warning: comparison of distinct pointer types lacks a cast
  (void) (&_max1 == &_max2);  \
                 ^
include/linux/kernel.h:747:9: note: in definition of macro 'max'
  typeof(y) _max2 = (y);   \
         ^
mm/cma.c:270:29: note: in expansion of macro 'max'
   (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
                             ^
include/linux/kernel.h:748:17: warning: comparison of distinct pointer types lacks a cast
  (void) (&_max1 == &_max2);  \
                 ^
include/linux/kernel.h:747:21: note: in definition of macro 'max'
  typeof(y) _max2 = (y);   \
                     ^
mm/cma.c:270:29: note: in expansion of macro 'max'
   (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
                             ^

Signed-off-by: Stephen Rothwell <[hidden email]>
---
 mm/cma.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

These warnings have been irking me for some time now ... applies to
Linus' tree and linux-next (and so to the mmotm tree).

diff --git a/mm/cma.c b/mm/cma.c
index ea506eb18cd6..fa823dc2ff15 100644
--- a/mm/cma.c
+++ b/mm/cma.c
@@ -183,7 +183,7 @@ int __init cma_init_reserved_mem(phys_addr_t base, phys_addr_t size,
  return -EINVAL;
 
  /* ensure minimal alignment required by mm core */
- alignment = PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order);
+ alignment = PAGE_SIZE << max_t(unsigned long, MAX_ORDER - 1, pageblock_order);
 
  /* alignment should be aligned with order_per_bit */
  if (!IS_ALIGNED(alignment >> PAGE_SHIFT, 1 << order_per_bit))
@@ -267,7 +267,7 @@ int __init cma_declare_contiguous(phys_addr_t base,
  * you couldn't get a contiguous memory, which is not what we want.
  */
  alignment = max(alignment,
- (phys_addr_t)PAGE_SIZE << max(MAX_ORDER - 1, pageblock_order));
+ (phys_addr_t)PAGE_SIZE << max_t(unsigned long, MAX_ORDER - 1, pageblock_order));
  base = ALIGN(base, alignment);
  size = ALIGN(size, alignment);
  limit &= ~(alignment - 1);
--
2.8.1



--
Cheers,
Stephen Rothwell