tree:   git://git.cmpxchg.org/linux-mmotm.git master
head:   c226e49f30453de9c6d82b001a985254990b32e0
commit: 2532e38f7f96933a97c1c5fca2d72b83feaf8cd7 [212/507] mm, mempool: poison elements backed by slab allocator
config: microblaze-mmu_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 2532e38f7f96933a97c1c5fca2d72b83feaf8cd7
  # save the attached .config to linux build tree
  make.cross ARCH=microblaze 

All warnings:

   mm/mempool.c: In function 'poison_error':
>> mm/mempool.c:30:2: warning: format '%ld' expects argument of type 'long int', but argument 3 has type 'size_t' [-Wformat=]
     pr_err("Mempool %p size %ld\n", pool, size);
     ^

vim +30 mm/mempool.c

    14	#include <linux/export.h>
    15	#include <linux/mempool.h>
    16	#include <linux/blkdev.h>
    17	#include <linux/writeback.h>
    18	#include "slab.h"
    19	
    20	#if defined(CONFIG_DEBUG_SLAB) || defined(CONFIG_SLUB_DEBUG_ON)
    21	static void poison_error(mempool_t *pool, void *element, size_t size,
    22				 size_t byte)
    23	{
    24		const int nr = pool->curr_nr;
    25		const int start = max_t(int, byte - (BITS_PER_LONG / 8), 0);
    26		const int end = min_t(int, byte + (BITS_PER_LONG / 8), size);
    27		int i;
    28	
    29		pr_err("BUG: mempool element poison mismatch\n");
  > 30		pr_err("Mempool %p size %ld\n", pool, size);
    31		pr_err(" nr=%d @ %p: %s0x", nr, element, start > 0 ? "... " : "");
    32		for (i = start; i < end; i++)
    33			pr_cont("%x ", *(u8 *)(element + i));
    34		pr_cont("%s\n", end < size ? "..." : "");
    35		dump_stack();
    36	}
    37	
    38	static void check_slab_element(mempool_t *pool, void *element)

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