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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: 77079b133f242d3e3710c9b89ed54458307e54ff
commit: d0b73b488c55df905ea8faaad079f8535629ed26 xtensa: Add config files for Diamond 233L - Rev C processor variant
date: 3 years, 9 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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