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Subjectarch/xtensa/include/asm/initialize_mmu.h:55: Error: invalid register 'atomctl' for 'wsr' instruction
Hi Max,

FYI, the error/warning still remains.

tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: fda604a4daa19ead458ce5471892fa1d4b382d82
commit: ca55b2fef3a9373fcfc30f82fd26bc7fccbda732 xtensa: add de212 core variant
date: 4 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@gmail.com>
:::::: CC: Chris Zankel <chris@zankel.net>

---
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https://lists.01.org/pipermail/kbuild-all Intel Corporation
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