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SubjectRe: [PATCH] mm, slab: rename kmalloc-node cache to kmalloc-<size>
On Wed, 8 Feb 2017 10:12:13 +0100 Vlastimil Babka <vbabka@suse.cz> wrote:

> On 02/07/2017 10:38 PM, Andrew Morton wrote:
> > On Wed, 8 Feb 2017 01:15:17 +0800 kbuild test robot <lkp@intel.com> wrote:
> >
> >> Hi Vlastimil,
> >>
> >> [auto build test WARNING on mmotm/master]
> >> [also build test WARNING on v4.10-rc7 next-20170207]
> >> [if your patch is applied to the wrong git tree, please drop us a note to help improve the system]
> >>
> >> url: https://github.com/0day-ci/linux/commits/Vlastimil-Babka/mm-slab-rename-kmalloc-node-cache-to-kmalloc-size/20170204-021843
> >> base: git://git.cmpxchg.org/linux-mmotm.git master
> >> config: arm-allyesconfig (attached as .config)
> >> compiler: arm-linux-gnueabi-gcc (Debian 6.1.1-9) 6.1.1 20160705
> >> 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
> >> # save the attached .config to linux build tree
> >> make.cross ARCH=arm
> >>
> >> All warnings (new ones prefixed by >>):
> >>
> >> >> WARNING: mm/built-in.o(.text+0x3b49c): Section mismatch in reference from the function get_kmalloc_cache_name() to the (unknown reference) .init.rodata:(unknown)
> >> The function get_kmalloc_cache_name() references
> >> the (unknown reference) __initconst (unknown).
> >> This is often because get_kmalloc_cache_name lacks a __initconst
> >> annotation or the annotation of (unknown) is wrong.
> >
> > yup, thanks.
>
> Thanks for the fix.
>
> I was going to implement Christoph's suggestion and export the whole structure
> in mm/slab.h, but gcc was complaining that I'm redefining it, until I created a
> typedef first. Is it worth the trouble? Below is how it would look like.
>
> ...
>
> --- a/mm/slab.h
> +++ b/mm/slab.h
> @@ -71,6 +71,13 @@ extern struct list_head slab_caches;
> /* The slab cache that manages slab cache information */
> extern struct kmem_cache *kmem_cache;
>
> +/* A table of kmalloc cache names and sizes */
> +typedef struct {
> + const char *name;
> + unsigned long size;
> +} kmalloc_info_t;
> +extern const kmalloc_info_t kmalloc_info[];

Why is the typedef needed? Can't we use something like

extern const struct kmalloc_info_struct {
const char *name;
unsigned long size;
} kmalloc_info[];

...

const struct kmalloc_info_struct kmalloc_info[] __initconst = {
{NULL, 0}, {"kmalloc-96", 96},
{"kmalloc-192", 192}, {"kmalloc-8", 8},
{"kmalloc-16", 16}, {"kmalloc-32", 32},
...
{"kmalloc-67108864", 67108864}
};

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