linux-kernel - Re: [PATCH WIP] x86/kgdb: trampolines for shadowed instructions

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Message-ID: <202408160303.FvgjFUth-lkp@intel.com>
Date: Fri, 16 Aug 2024 03:51:27 +0800
From: kernel test robot <lkp@...el.com>
To: Florian Rommel <mail@...rommel.de>,
	Thomas Gleixner <tglx@...utronix.de>,
	Daniel Thompson <daniel.thompson@...aro.org>
Cc: oe-kbuild-all@...ts.linux.dev, Ingo Molnar <mingo@...hat.com>,
	Borislav Petkov <bp@...en8.de>,
	Dave Hansen <dave.hansen@...ux.intel.com>,
	"H . Peter Anvin" <hpa@...or.com>,
	Jason Wessel <jason.wessel@...driver.com>,
	Douglas Anderson <dianders@...omium.org>,
	Lorena Kretzschmar <qy15sije@....cs.fau.de>,
	Stefan Saecherl <stefan.saecherl@....de>,
	Peter Zijlstra <peterz@...radead.org>,
	Christophe JAILLET <christophe.jaillet@...adoo.fr>,
	Randy Dunlap <rdunlap@...radead.org>,
	Masami Hiramatsu <mhiramat@...nel.org>,
	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Memory Management List <linux-mm@...ck.org>,
	Christophe Leroy <christophe.leroy@...roup.eu>,
	Geert Uytterhoeven <geert+renesas@...der.be>,
	kgdb-bugreport@...ts.sourceforge.net, x86@...nel.org,
	linux-kernel@...r.kernel.org, Kees Cook <kees@...nel.org>,
	Florian Rommel <mail@...rommel.de>
Subject: Re: [PATCH WIP] x86/kgdb: trampolines for shadowed instructions

Hi Florian,

kernel test robot noticed the following build errors:

[auto build test ERROR on tip/master]
[also build test ERROR on tip/x86/core linus/master v6.11-rc3 next-20240815]
[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#_base_tree_information]

url:    https://github.com/intel-lab-lkp/linux/commits/Florian-Rommel/x86-kgdb-trampolines-for-shadowed-instructions/20240814-230936
base:   tip/master
patch link:    https://lore.kernel.org/r/20240814085141.171564-1-mail%40florommel.de
patch subject: [PATCH WIP] x86/kgdb: trampolines for shadowed instructions
config: x86_64-buildonly-randconfig-004-20240815 (https://download.01.org/0day-ci/archive/20240816/202408160303.FvgjFUth-lkp@intel.com/config)
compiler: gcc-12 (Debian 12.2.0-14) 12.2.0
reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240816/202408160303.FvgjFUth-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/202408160303.FvgjFUth-lkp@intel.com/

All errors (new ones prefixed by >>):

   ld: vmlinux.o: in function `kgdb_arch_init':
>> arch/x86/kernel/kgdb.c:416: undefined reference to `execmem_alloc'


vim +416 arch/x86/kernel/kgdb.c

   410	
   411	static int kgdb_init_trampolines(void)
   412	{
   413		/* FIXME: We should reserve enough space for all breakpoints
   414		   or make the trampoline table dynamic somehow.. */
   415		/* FIXME: Currently borrowing EXECMEM_KPROBES */
 > 416		kgdb_trampoline_page = execmem_alloc(EXECMEM_KPROBES, PAGE_SIZE);
   417		if (!kgdb_trampoline_page)
   418			return 1;
   419		memset(kgdb_trampoline_page, INT3_INSN_OPCODE, PAGE_SIZE);
   420		set_memory_rox((unsigned long)kgdb_trampoline_page, 1);
   421		kgdb_trampoline_page_curr_slot = kgdb_trampoline_page;
   422		return 0;
   423	}
   424	

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