Subject: Re: [PATCH 1/2] powerpc/32s: Do kuep_lock() and kuep_unlock() in assembly

From: kernel test robot <[email-masked]>
Date: Fri, 9 Jul 2021 20:55:53 +0800

Hi Christophe,

I love your patch! Yet something to improve:

[auto build test ERROR on powerpc/next]
[also build test ERROR on next-20210709]
[cannot apply to v5.13]
[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/Christophe-Leroy/powerpc-32s-Do-kuep_lock-and-kuep_unlock-in-assembly/20210709-155049
base:   https://git.kernel.org/pub/scm/linux/kernel/git/powerpc/linux.git next
config: powerpc-randconfig-r032-20210709 (attached as .config)
compiler: powerpc-linux-gcc (GCC) 9.3.0
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/8f55557e42a793db98e4e60b7c65d47a6c5a4b62
        git remote add linux-review https://github.com/0day-ci/linux
        git fetch --no-tags linux-review Christophe-Leroy/powerpc-32s-Do-kuep_lock-and-kuep_unlock-in-assembly/20210709-155049
        git checkout 8f55557e42a793db98e4e60b7c65d47a6c5a4b62
        # save the attached .config to linux build tree
        mkdir build_dir
        COMPILER_INSTALL_PATH=$HOME/0day COMPILER=gcc-9.3.0 make.cross O=build_dir ARCH=powerpc SHELL=/bin/bash arch/powerpc/

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email-masked]>

All errors (new ones prefixed by >>):

   arch/powerpc/kernel/entry_32.S: Assembler messages:
>> arch/powerpc/kernel/entry_32.S:110: Error: unrecognized opcode: `update_user_segments_by_4'
>> arch/powerpc/kernel/entry_32.S:132: Error: unrecognized opcode: `update_user_segments_by_6'
   arch/powerpc/kernel/entry_32.S:300: Error: unrecognized opcode: `update_user_segments_by_6'

vim +110 arch/powerpc/kernel/entry_32.S

    85	
    86		.globl	transfer_to_syscall
    87	transfer_to_syscall:
    88		stw	r11, GPR1(r1)
    89		stw	r11, 0(r1)
    90		mflr	r12
    91		stw	r12, _LINK(r1)
    92	#if defined(CONFIG_BOOKE) || defined(CONFIG_40x)
    93		rlwinm	r9,r9,0,14,12		/* clear MSR_WE (necessary?) */
    94	#endif
    95		lis	r12,STACK_FRAME_REGS_MARKER@ha /* exception frame marker */
    96		SAVE_GPR(2, r1)
    97		addi	r12,r12,STACK_FRAME_REGS_MARKER@l
    98		stw	r9,_MSR(r1)
    99		li	r2, INTERRUPT_SYSCALL
   100		stw	r12,8(r1)
   101		stw	r2,_TRAP(r1)
   102		SAVE_GPR(0, r1)
   103		SAVE_4GPRS(3, r1)
   104		SAVE_2GPRS(7, r1)
   105		addi	r2,r10,-THREAD
   106	#ifdef CONFIG_PPC_KUEP
   107		mfsr    r9,0
   108		rlwinm  r9,r9,0,8,3
   109		oris    r9,r9,SR_NX@h
 > 110		update_user_segments_by_4 r9, r10, r11, r12
   111	#endif
   112		SAVE_NVGPRS(r1)
   113	
   114		/* Calling convention has r9 = orig r0, r10 = regs */
   115		addi	r10,r1,STACK_FRAME_OVERHEAD
   116		mr	r9,r0
   117		bl	system_call_exception
   118	
   119	ret_from_syscall:
   120		addi    r4,r1,STACK_FRAME_OVERHEAD
   121		li	r5,0
   122		bl	syscall_exit_prepare
   123	#ifdef CONFIG_PPC_47x
   124		lis	r4,icache_44x_need_flush@ha
   125		lwz	r5,icache_44x_need_flush@l(r4)
   126		cmplwi	cr0,r5,0
   127		bne-	2f
   128	#endif /* CONFIG_PPC_47x */
   129	#ifdef CONFIG_PPC_KUEP
   130		mfsr    r7,0
   131		rlwinm  r7,r7,0,8,2
 > 132		update_user_segments_by_6 r7, r8, r9, r10, r11, r12
   133	#endif
   134		lwz	r4,_LINK(r1)
   135		lwz	r5,_CCR(r1)
   136		mtlr	r4
   137		lwz	r7,_NIP(r1)
   138		lwz	r8,_MSR(r1)
   139		cmpwi	r3,0
   140		lwz	r3,GPR3(r1)
   141	syscall_exit_finish:
   142		mtspr	SPRN_SRR0,r7
   143		mtspr	SPRN_SRR1,r8
   144	
   145		bne	3f
   146		mtcr	r5
   147	

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0-DAY CI Kernel Test Service, Intel Corporation
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