Re: [mmotm:master 185/397] mm/nommu.c:1193:8: warning: assignment makes pointer from integer without a cast

[Joonsoo Kim <iamjoonsoo.kim@lge.com>]

On Thu, Nov 27, 2014 at 08:20:35AM +0800, kbuild test robot wrote:
> tree:   git://git.cmpxchg.org/linux-mmotm.git master
> head:   a2d887dee78e23dc092ff14ae2ad22592437a328
> commit: cd4687a1102a69d9045d09e0af6bb9bacfb49ee5 [185/397] mm/nommu: use alloc_pages_exact() rather than it's own implementation
> config: m32r-m32104ut_defconfig (attached as .config)
> reproduce:
>   wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
>   chmod +x ~/bin/make.cross
>   git checkout cd4687a1102a69d9045d09e0af6bb9bacfb49ee5
>   # save the attached .config to linux build tree
>   make.cross ARCH=m32r 
> 
> All warnings:
> 
>    mm/nommu.c: In function 'do_mmap_private':
> >> mm/nommu.c:1193:8: warning: assignment makes pointer from integer without a cast
>       base = __get_free_pages(GFP_KERNEL, order);
>            ^
> 
> vim +1193 mm/nommu.c
> 
>   1177		/* allocate some memory to hold the mapping
>   1178		 * - note that this may not return a page-aligned address if the object
>   1179		 *   we're allocating is smaller than a page
>   1180		 */
>   1181		order = get_order(len);
>   1182		kdebug("alloc order %d for %lx", order, len);
>   1183	
>   1184		total = 1 << order;
>   1185		point = len >> PAGE_SHIFT;
>   1186	
>   1187		/* we don't want to allocate a power-of-2 sized page set */
>   1188		if (sysctl_nr_trim_pages && total - point >= sysctl_nr_trim_pages) {
>   1189			total = point;
>   1190			kdebug("try to alloc exact %lu pages", total);
>   1191			base = alloc_pages_exact(len, GFP_KERNEL);
>   1192		} else {
> > 1193			base = __get_free_pages(GFP_KERNEL, order);
>   1194		}

This will fix the warning.
Thanks.

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