Hi Geert,

I love your patch! Yet something to improve:

[auto build test ERROR on robh/for-next]
[also build test ERROR on arm64/for-next/core arm/for-next linus/master v5.14-rc5 next-20210811]
[If your patch is applied to the wrong git tree, kindly drop us a note.
And when submitting patch, we suggest to use '--base' as documented in
https://git-scm.com/docs/git-format-patch]

url:    https://github.com/0day-ci/linux/commits/Geert-Uytterhoeven/Add-generic-support-for-kdump-DT-properties/20210811-165455
base:   https://git.kernel.org/pub/scm/linux/kernel/git/robh/linux.git for-next
config: ia64-allmodconfig (attached as .config)
compiler: ia64-linux-gcc (GCC) 10.3.0
reproduce (this is a W=1 build):
        wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
        chmod +x ~/bin/make.cross
        # https://github.com/0day-ci/linux/commit/34ef57fdde286c4999f0deea8ee16d56d2ac3bae
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Geert-Uytterhoeven/Add-generic-support-for-kdump-DT-properties/20210811-165455
        git checkout 34ef57fdde286c4999f0deea8ee16d56d2ac3bae
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-10.3.0 make.cross O=build_dir ARCH=ia64 SHELL=/bin/bash drivers/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@intel.com>

All errors (new ones prefixed by >>):

>> drivers/of/fdt.c:593:20: error: conflicting types for 'reserve_elfcorehdr'
     593 | static void __init reserve_elfcorehdr(void)
         |                    ^~~~~~~~~~~~~~~~~~
   In file included from arch/ia64/include/asm/mmzone.h:16,
                    from arch/ia64/include/asm/nodedata.h:17,
                    from arch/ia64/include/asm/processor.h:81,
                    from arch/ia64/include/asm/thread_info.h:12,
                    from include/linux/thread_info.h:60,
                    from include/asm-generic/preempt.h:5,
                    from ./arch/ia64/include/generated/asm/preempt.h:1,
                    from include/linux/preempt.h:78,
                    from include/linux/rcupdate.h:27,
                    from include/linux/rculist.h:11,
                    from include/linux/pid.h:5,
                    from include/linux/sched.h:14,
                    from include/linux/ptrace.h:6,
                    from arch/ia64/include/asm/user.h:32,
                    from include/linux/user.h:1,
                    from include/linux/elfcore.h:5,
                    from include/linux/crash_core.h:6,
                    from include/linux/kexec.h:18,
                    from include/linux/crash_dump.h:5,
                    from drivers/of/fdt.c:11:
   arch/ia64/include/asm/meminit.h:43:12: note: previous declaration of 'reserve_elfcorehdr' was here
      43 | extern int reserve_elfcorehdr(u64 *start, u64 *end);
         |            ^~~~~~~~~~~~~~~~~~


vim +/reserve_elfcorehdr +593 drivers/of/fdt.c

   584	
   585	/*
   586	 * reserve_elfcorehdr() - reserves memory for elf core header
   587	 *
   588	 * This function reserves the memory occupied by an elf core header
   589	 * described in the device tree. This region contains all the
   590	 * information about primary kernel's core image and is used by a dump
   591	 * capture kernel to access the system memory on primary kernel.
   592	 */
 > 593	static void __init reserve_elfcorehdr(void)
   594	{
   595		if (!IS_ENABLED(CONFIG_CRASH_DUMP) || !elfcorehdr_size)
   596			return;
   597	
   598		if (memblock_is_region_reserved(elfcorehdr_addr, elfcorehdr_size)) {
   599			pr_warn("elfcorehdr is overlapped\n");
   600			return;
   601		}
   602	
   603		memblock_reserve(elfcorehdr_addr, elfcorehdr_size);
   604	
   605		pr_info("Reserving %llu KiB of memory at 0x%llx for elfcorehdr\n",
   606			elfcorehdr_size >> 10, elfcorehdr_addr);
   607	}
   608	

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all(a)lists.01.org