linux-kernel - Re: [PATCH v5 1/7] kexec_file: allow to place kexec

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Date: Sat, 8 Jun 2024 12:23:35 +0800
From: kernel test robot <lkp@...el.com>
To: Coiby Xu <coxu@...hat.com>, kexec@...ts.infradead.org
Cc: llvm@...ts.linux.dev, oe-kbuild-all@...ts.linux.dev,
	Ondrej Kozina <okozina@...hat.com>,
	Milan Broz <gmazyland@...il.com>,
	Thomas Staudt <tstaudt@...ibm.com>,
	Daniel P . Berrangé <berrange@...hat.com>,
	Kairui Song <ryncsn@...il.com>,
	Jan Pazdziora <jpazdziora@...hat.com>,
	Pingfan Liu <kernelfans@...il.com>, Baoquan He <bhe@...hat.com>,
	Dave Young <dyoung@...hat.com>, linux-kernel@...r.kernel.org,
	x86@...nel.org, Dave Hansen <dave.hansen@...el.com>,
	Vitaly Kuznetsov <vkuznets@...hat.com>, Greg KH <greg@...ah.com>,
	Eric Biederman <ebiederm@...ssion.com>
Subject: Re: [PATCH v5 1/7] kexec_file: allow to place kexec_buf randomly

Hi Coiby,

kernel test robot noticed the following build errors:

[auto build test ERROR on 8a92980606e3585d72d510a03b59906e96755b8a]

url:    https://github.com/intel-lab-lkp/linux/commits/Coiby-Xu/kexec_file-allow-to-place-kexec_buf-randomly/20240607-203154
base:   8a92980606e3585d72d510a03b59906e96755b8a
patch link:    https://lore.kernel.org/r/20240607122622.167228-2-coxu%40redhat.com
patch subject: [PATCH v5 1/7] kexec_file: allow to place kexec_buf randomly
config: x86_64-kexec (https://download.01.org/0day-ci/archive/20240608/202406081214.kNbwlJWP-lkp@intel.com/config)
compiler: clang version 18.1.5 (https://github.com/llvm/llvm-project 617a15a9eac96088ae5e9134248d8236e34b91b1)
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240608/202406081214.kNbwlJWP-lkp@intel.com/reproduce)

If you fix the issue in a separate patch/commit (i.e. not just a new version of
the same patch/commit), kindly add following tags
| Reported-by: kernel test robot <lkp@...el.com>
| Closes: https://lore.kernel.org/oe-kbuild-all/202406081214.kNbwlJWP-lkp@intel.com/

All errors (new ones prefixed by >>):

>> kernel/kexec_file.c:504:12: error: no member named 'random' in 'struct kexec_buf'
     504 |         if (kbuf->random)
         |             ~~~~  ^
>> kernel/kexec_file.c:505:16: error: call to undeclared function 'kexec_random_start'; ISO C99 and later do not support implicit function declarations [-Wimplicit-function-declaration]
     505 |                 temp_start = kexec_random_start(temp_start, end);
         |                              ^
   2 errors generated.


vim +504 kernel/kexec_file.c

   496	
   497	static int locate_mem_hole_bottom_up(unsigned long start, unsigned long end,
   498					     struct kexec_buf *kbuf)
   499	{
   500		struct kimage *image = kbuf->image;
   501		unsigned long temp_start, temp_end;
   502	
   503		temp_start = max(start, kbuf->buf_min);
 > 504		if (kbuf->random)
 > 505			temp_start = kexec_random_start(temp_start, end);
   506	
   507		do {
   508			temp_start = ALIGN(temp_start, kbuf->buf_align);
   509			temp_end = temp_start + kbuf->memsz - 1;
   510	
   511			if (temp_end > end || temp_end > kbuf->buf_max)
   512				return 0;
   513			/*
   514			 * Make sure this does not conflict with any of existing
   515			 * segments
   516			 */
   517			if (kimage_is_destination_range(image, temp_start, temp_end)) {
   518				temp_start = temp_start + PAGE_SIZE;
   519				continue;
   520			}
   521	
   522			/* We found a suitable memory range */
   523			break;
   524		} while (1);
   525	
   526		/* If we are here, we found a suitable memory range */
   527		kbuf->mem = temp_start;
   528	
   529		/* Success, stop navigating through remaining System RAM ranges */
   530		return 1;
   531	}
   532	

-- 
0-DAY CI Kernel Test Service
https://github.com/intel/lkp-tests/wiki