Re: [linux-next:master 8266/8290] arch/xtensa/mm/kasan_init.c:49:35: warning: format '%zu' expects argument of type 'size_t', but argument 3 has type 'long unsigned int'

[Andrew Morton <akpm@linux-foundation.org>]

On Fri, 15 Feb 2019 07:26:21 +0800 kbuild test robot <lkp@intel.com> wrote:

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/next/linux-next.git master
> head:   c4f3ef3eb53fd7e8cbfe200d5ff6dba2b08526b5
> commit: 5107c1e0490f01323cf3296f758271b06d9bb0f9 [8266/8290] treewide: add checks for the return value of memblock_alloc*()
> config: xtensa-allyesconfig (attached as .config)
> compiler: xtensa-linux-gcc (GCC) 8.2.0
> reproduce:
>         wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout 5107c1e0490f01323cf3296f758271b06d9bb0f9
>         # save the attached .config to linux build tree
>         GCC_VERSION=8.2.0 make.cross ARCH=xtensa 
> 
> All warnings (new ones prefixed by >>):
> 
>    arch/xtensa/mm/kasan_init.c: In function 'populate':
> >> arch/xtensa/mm/kasan_init.c:49:35: warning: format '%zu' expects argument of type 'size_t', but argument 3 has type 'long unsigned int' [-Wformat=]
>       panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
>                                     ~~^
>                                     %lu
>             __func__, n_pages * sizeof(pte_t), PAGE_SIZE);
>                       ~~~~~~~~~~~~~~~~~~~~~~~

OK, thanks.  UL * size_t = UL.

--- a/arch/xtensa/mm/kasan_init.c~treewide-add-checks-for-the-return-value-of-memblock_alloc-fix-3-fix
+++ a/arch/xtensa/mm/kasan_init.c
@@ -46,7 +46,7 @@ static void __init populate(void *start,
 	pte_t *pte = memblock_alloc(n_pages * sizeof(pte_t), PAGE_SIZE);
 
 	if (!pte)
-		panic("%s: Failed to allocate %zu bytes align=0x%lx\n",
+		panic("%s: Failed to allocate %lu bytes align=0x%lx\n",
 		      __func__, n_pages * sizeof(pte_t), PAGE_SIZE);
 
 	pr_debug("%s: %p - %p\n", __func__, start, end);
_