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    Subjectarch/xtensa/include/asm/initialize_mmu.h:41: Error: invalid register 'atomctl' for 'wsr' instruction
    Hi Pete,

    FYI, the error/warning still remains.

    tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
    head: be67d60ba944bdd38571b79bdcd506e34c0f16c1
    commit: d0b73b488c55df905ea8faaad079f8535629ed26 xtensa: Add config files for Diamond 233L - Rev C processor variant
    date: 3 years, 7 months ago
    config: xtensa-generic_kc705_defconfig (attached as .config)
    compiler: xtensa-linux-gcc (GCC) 4.9.0
    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 d0b73b488c55df905ea8faaad079f8535629ed26
    # 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:41: Error: invalid register 'atomctl' for 'wsr' instruction

    vim +41 arch/xtensa/include/asm/initialize_mmu.h

    c622b29d Max Filippov 2012-11-19 25
    c622b29d Max Filippov 2012-11-19 26 #ifdef __ASSEMBLY__
    c622b29d Max Filippov 2012-11-19 27
    c622b29d Max Filippov 2012-11-19 28 #define XTENSA_HWVERSION_RC_2009_0 230000
    c622b29d Max Filippov 2012-11-19 29
    c622b29d Max Filippov 2012-11-19 30 .macro initialize_mmu
    c622b29d Max Filippov 2012-11-19 31
    c622b29d Max Filippov 2012-11-19 32 #if XCHAL_HAVE_S32C1I && (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
    c622b29d Max Filippov 2012-11-19 33 /*
    c622b29d Max Filippov 2012-11-19 34 * We Have Atomic Operation Control (ATOMCTL) Register; Initialize it.
    c622b29d Max Filippov 2012-11-19 35 * For details see Documentation/xtensa/atomctl.txt
    c622b29d Max Filippov 2012-11-19 36 */
    c622b29d Max Filippov 2012-11-19 37 #if XCHAL_DCACHE_IS_COHERENT
    c622b29d Max Filippov 2012-11-19 38 movi a3, 0x25 /* For SMP/MX -- internal for writeback,
    c622b29d Max Filippov 2012-11-19 39 * RCW otherwise
    c622b29d Max Filippov 2012-11-19 40 */
    c622b29d Max Filippov 2012-11-19 @41 #else
    c622b29d Max Filippov 2012-11-19 42 movi a3, 0x29 /* non-MX -- Most cores use Std Memory
    c622b29d Max Filippov 2012-11-19 43 * Controlers which usually can't use RCW
    c622b29d Max Filippov 2012-11-19 44 */
    c622b29d Max Filippov 2012-11-19 45 #endif
    c622b29d Max Filippov 2012-11-19 46 wsr a3, atomctl
    c622b29d Max Filippov 2012-11-19 47 #endif /* XCHAL_HAVE_S32C1I &&
    c622b29d Max Filippov 2012-11-19 48 * (XCHAL_HW_MIN_VERSION >= XTENSA_HWVERSION_RC_2009_0)
    c622b29d Max Filippov 2012-11-19 49 */

    :::::: The code at line 41 was first introduced by commit
    :::::: c622b29d1f38021411965b7e0170ab055551b257 xtensa: initialize atomctl SR

    :::::: TO: Max Filippov <jcmvbkbc@gmail.com>
    :::::: CC: Chris Zankel <chris@zankel.net>

    ---
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