linux-kernel - Re: arch/xtensa/include/asm/initialize_mmu.h:55: Error: invalid register 'atomctl' for 'wsr' instruction

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Date:	Sun, 20 Mar 2016 14:54:54 +0300
From:	Max Filippov <jcmvbkbc@...il.com>
To:	kbuild test robot <fengguang.wu@...el.com>
Cc:	kbuild-all@...org, LKML <linux-kernel@...r.kernel.org>
Subject: Re: arch/xtensa/include/asm/initialize_mmu.h:55: Error: invalid
 register 'atomctl' for 'wsr' instruction

Hi Fengguang,

On Sun, Mar 20, 2016 at 8:34 AM, kbuild test robot
<fengguang.wu@...el.com> wrote:
> Hi Max,
>
> FYI, the error/warning still remains.

Each xtensa core configuration requires corresponding toolchain to be
built correctly.
In this case the toolchain needs to be built for de212 core with the
following overlay:
  https://github.com/jcmvbkbc/xtensa-toolchain-build/blob/master/overlays/xtensa_de212.tar.gz

> tree:   https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
> head:   1e75a9f34a5ed5902707fb74b468356c55142b71
> commit: ca55b2fef3a9373fcfc30f82fd26bc7fccbda732 xtensa: add de212 core variant
> date:   5 months ago
> config: xtensa-nommu_kc705_defconfig (attached as .config)
> reproduce:
>         wget https://git.kernel.org/cgit/linux/kernel/git/wfg/lkp-tests.git/plain/sbin/make.cross -O ~/bin/make.cross
>         chmod +x ~/bin/make.cross
>         git checkout ca55b2fef3a9373fcfc30f82fd26bc7fccbda732
>         # save the attached .config to linux build tree
>         make.cross ARCH=xtensa
>
> All errors (new ones prefixed by >>):
>
>    arch/xtensa/include/asm/initialize_mmu.h: Assembler messages:
>>> arch/xtensa/include/asm/initialize_mmu.h:55: Error: invalid register 'atomctl' for 'wsr' instruction
>
> vim +55 arch/xtensa/include/asm/initialize_mmu.h
>
> 6cb97111 Baruch Siach 2013-12-29  39
> c622b29d Max Filippov 2012-11-19  40  #ifdef __ASSEMBLY__
> c622b29d Max Filippov 2012-11-19  41
> c622b29d Max Filippov 2012-11-19  42  #define XTENSA_HWVERSION_RC_2009_0 230000
> c622b29d Max Filippov 2012-11-19  43
> c622b29d Max Filippov 2012-11-19  44    .macro  initialize_mmu
> c622b29d Max Filippov 2012-11-19  45
> c622b29d Max Filippov 2012-11-19  46  #if XCHAL_HAVE_S32C1I && (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
> c622b29d Max Filippov 2012-11-19  47  /*
> c622b29d Max Filippov 2012-11-19  48   * We Have Atomic Operation Control (ATOMCTL) Register; Initialize it.
> c622b29d Max Filippov 2012-11-19  49   * For details see Documentation/xtensa/atomctl.txt
> c622b29d Max Filippov 2012-11-19  50   */
> c622b29d Max Filippov 2012-11-19  51  #if XCHAL_DCACHE_IS_COHERENT
> c622b29d Max Filippov 2012-11-19  52    movi    a3, 0x25        /* For SMP/MX -- internal for writeback,
> c622b29d Max Filippov 2012-11-19  53                             * RCW otherwise
> c622b29d Max Filippov 2012-11-19  54                             */
> c622b29d Max Filippov 2012-11-19 @55  #else
> c622b29d Max Filippov 2012-11-19  56    movi    a3, 0x29        /* non-MX -- Most cores use Std Memory
> c622b29d Max Filippov 2012-11-19  57                             * Controlers which usually can't use RCW
> c622b29d Max Filippov 2012-11-19  58                             */
> c622b29d Max Filippov 2012-11-19  59  #endif
> c622b29d Max Filippov 2012-11-19  60    wsr     a3, atomctl
> c622b29d Max Filippov 2012-11-19  61  #endif  /* XCHAL_HAVE_S32C1I &&
> c622b29d Max Filippov 2012-11-19  62     * (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
> c622b29d Max Filippov 2012-11-19  63     */
>
> :::::: The code at line 55 was first introduced by commit
> :::::: c622b29d1f38021411965b7e0170ab055551b257 xtensa: initialize atomctl SR
>
> :::::: TO: Max Filippov <jcmvbkbc@...il.com>
> :::::: CC: Chris Zankel <chris@...kel.net>
>
> ---
> 0-DAY kernel test infrastructure                Open Source Technology Center
> https://lists.01.org/pipermail/kbuild-all                   Intel Corporation



-- 
Thanks.
-- Max