linux-kernel - [peterz-queue:x86/wip.ibt 19/31] arch/x86/kernel/alternative.c:761:16: error: expected string literal in 'asm'

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Message-ID: <202202202357.ldfBr75W-lkp@intel.com>
Date:   Mon, 21 Feb 2022 00:02:29 +0800
From:   kernel test robot <lkp@...el.com>
To:     Peter Zijlstra <peterz@...radead.org>
Cc:     llvm@...ts.linux.dev, kbuild-all@...ts.01.org,
        linux-kernel@...r.kernel.org
Subject: [peterz-queue:x86/wip.ibt 19/31]
 arch/x86/kernel/alternative.c:761:16: error: expected string literal in
 'asm'

tree:   https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git x86/wip.ibt
head:   fecdb8a84191710ffe01c9492fceb34a15f1576a
commit: 97e04204b3c4f0515f956be22a19229878b9253e [19/31] x86/ibt: Annotate text references
config: i386-randconfig-a002 (https://download.01.org/0day-ci/archive/20220220/202202202357.ldfBr75W-lkp@intel.com/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project d271fc04d5b97b12e6b797c6067d3c96a8d7470e)
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://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git/commit/?id=97e04204b3c4f0515f956be22a19229878b9253e
        git remote add peterz-queue https://git.kernel.org/pub/scm/linux/kernel/git/peterz/queue.git
        git fetch --no-tags peterz-queue x86/wip.ibt
        git checkout 97e04204b3c4f0515f956be22a19229878b9253e
        # save the config file to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 O=build_dir ARCH=i386 SHELL=/bin/bash

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

All errors (new ones prefixed by >>):

   arch/x86/kernel/alternative.c:716:2: error: expected ')'
           ANNOTATE_NOENDBR
           ^
   arch/x86/kernel/alternative.c:712:5: note: to match this '('
   asm (
       ^
>> arch/x86/kernel/alternative.c:761:16: error: expected string literal in 'asm'
           asm volatile (ANNOTATE_NOENDBR
                         ^
   2 errors generated.


vim +/asm +761 arch/x86/kernel/alternative.c

   743	
   744	static void __init int3_selftest(void)
   745	{
   746		static __initdata struct notifier_block int3_exception_nb = {
   747			.notifier_call	= int3_exception_notify,
   748			.priority	= INT_MAX-1, /* last */
   749		};
   750		unsigned int val = 0;
   751	
   752		BUG_ON(register_die_notifier(&int3_exception_nb));
   753	
   754		/*
   755		 * Basically: int3_magic(&val); but really complicated :-)
   756		 *
   757		 * Stick the address of the INT3 instruction into int3_selftest_ip,
   758		 * then trigger the INT3, padded with NOPs to match a CALL instruction
   759		 * length.
   760		 */
 > 761		asm volatile (ANNOTATE_NOENDBR
   762			      "1: int3; nop; nop; nop; nop\n\t"
   763			      ".pushsection .init.data,\"aw\"\n\t"
   764			      ".align " __ASM_SEL(4, 8) "\n\t"
   765			      ".type int3_selftest_ip, @object\n\t"
   766			      ".size int3_selftest_ip, " __ASM_SEL(4, 8) "\n\t"
   767			      "int3_selftest_ip:\n\t"
   768			      __ASM_SEL(.long, .quad) " 1b\n\t"
   769			      ".popsection\n\t"
   770			      : ASM_CALL_CONSTRAINT
   771			      : __ASM_SEL_RAW(a, D) (&val)
   772			      : "memory");
   773	
   774		BUG_ON(val != 1);
   775	
   776		unregister_die_notifier(&int3_exception_nb);
   777	}
   778	

---
0-DAY CI Kernel Test Service, Intel Corporation
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