linux-kernel - clang-13: s390/kernel/head64.S:24:17: error: invalid operand for instruction

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Date:   Mon, 11 Oct 2021 11:47:42 +0530
From:   Naresh Kamboju <naresh.kamboju@...aro.org>
To:     llvm@...ts.linux.dev, linux-s390@...r.kernel.org,
        clang-built-linux <clang-built-linux@...glegroups.com>,
        open list <linux-kernel@...r.kernel.org>
Cc:     Nathan Chancellor <nathan@...nel.org>,
        Nick Desaulniers <ndesaulniers@...gle.com>,
        Alexander Egorenkov <egorenar@...ux.ibm.com>,
        Christian Borntraeger <borntraeger@...ibm.com>,
        Vasily Gorbik <gor@...ux.ibm.com>,
        Heiko Carstens <hca@...ux.ibm.com>
Subject: clang-13: s390/kernel/head64.S:24:17: error: invalid operand for instruction

[Please ignore this email if it is already reported ]

Following s390 builds failed due to warnings / errors.

metadata:
    git_describe: v5.15-rc5
    git_repo: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
    git_short_log: 64570fbc14f8 (\"Linux 5.15-rc5\")
    target_arch: s390
    toolchain: clang-13


Fail (2861 errors) s390 (tinyconfig) with clang-nightly
  @ https://builds.tuxbuild.com/1zL35IUSGhDGeVuyIrAp7eyzEUi/
Fail (2861 errors) s390 (tinyconfig) with clang-13
  @ https://builds.tuxbuild.com/1zL35Hn7wjErKsLDM6zAgh27BYJ/
Fail (4112 errors) s390 (allnoconfig) with clang-13
  @ https://builds.tuxbuild.com/1zL35HR60hSFvBmAcYJvKHm8Lko/
Fail (4112 errors) s390 (allnoconfig) with clang-nightly
  @ https://builds.tuxbuild.com/1zL35DTlrX9qRGCtGqgtmmMDjnQ/
Fail (23048 errors) s390 (defconfig) with clang-13
  @ https://builds.tuxbuild.com/1zL35DE2KWQUPxbbXeTbwIJaWXS/
Fail (23045 errors) s390 (defconfig) with clang-nightly
  @ https://builds.tuxbuild.com/1zL35EgeQfWQDXDupp4itkUO5At/


Build errors log:
----------------
arch/s390/kernel/head64.S:24:17: error: invalid operand for instruction
 lctlg %c0,%c15,.Lctl-.LPG1(%r13) # load control registers
                ^
arch/s390/kernel/head64.S:40:8: error: invalid operand for instruction
 lpswe .Ldw-.(%r13) # load disabled wait psw
       ^
make[3]: *** [scripts/Makefile.build:379: arch/s390/kernel/head64.o] Error 1
In file included from kernel/sched/cputime.c:5:
In file included from kernel/sched/sched.h:5:
In file included from include/linux/sched.h:14:
In file included from include/linux/pid.h:6:
In file included from include/linux/wait.h:9:
In file included from include/linux/spinlock.h:94:
arch/s390/include/asm/spinlock.h:89:3: error: expected absolute expression
                ALTERNATIVE("", ".long 0xb2fa0070", 49) /* NIAI 7 */
                ^
arch/s390/include/asm/alternative.h:111:2: note: expanded from macro
'ALTERNATIVE'
        ALTINSTR_REPLACEMENT(altinstr, 1)                               \
        ^
arch/s390/include/asm/alternative.h:106:2: note: expanded from macro
'ALTINSTR_REPLACEMENT'
        INSTR_LEN_SANITY_CHECK(altinstr_len(num))
        ^
arch/s390/include/asm/alternative.h:62:3: note: expanded from macro
'INSTR_LEN_SANITY_CHECK'
        ".if " len " > 254\n"                                           \
         ^
<inline asm>:5:5: note: instantiated into assembly here
.if 6651b-6641b > 254
    ^
In file included from kernel/sched/cputime.c:5:
In file included from kernel/sched/sched.h:5:
In file included from include/linux/sched.h:14:
In file included from include/linux/pid.h:6:
In file included from include/linux/wait.h:9:
In file included from include/linux/spinlock.h:94:
arch/s390/include/asm/spinlock.h:89:3: error: cpu alternatives does
not support instructions blocks > 254 bytes
                ALTERNATIVE("", ".long 0xb2fa0070", 49) /* NIAI 7 */
                ^
arch/s390/include/asm/alternative.h:111:2: note: expanded from macro
'ALTERNATIVE'
        ALTINSTR_REPLACEMENT(altinstr, 1)                               \
        ^
arch/s390/include/asm/alternative.h:106:2: note: expanded from macro
'ALTINSTR_REPLACEMENT'
        INSTR_LEN_SANITY_CHECK(altinstr_len(num))
        ^
arch/s390/include/asm/alternative.h:63:3: note: expanded from macro
'INSTR_LEN_SANITY_CHECK'
        "\t.error \"cpu alternatives does not support instructions "    \
         ^
<inline asm>:6:2: note: instantiated into assembly here
        .error "cpu alternatives does not support instructions blocks
> 254 bytes"
        ^
In file included from kernel/sched/cputime.c:5:
In file included from kernel/sched/sched.h:5:
In file included from include/linux/sched.h:14:
In file included from include/linux/pid.h:6:
In file included from include/linux/wait.h:9:
In file included from include/linux/spinlock.h:94:
arch/s390/include/asm/spinlock.h:89:3: error: expected absolute expression
                ALTERNATIVE("", ".long 0xb2fa0070", 49) /* NIAI 7 */
                ^
arch/s390/include/asm/alternative.h:111:2: note: expanded from macro
'ALTERNATIVE'
        ALTINSTR_REPLACEMENT(altinstr, 1)                               \
        ^
arch/s390/include/asm/alternative.h:106:2: note: expanded from macro
'ALTINSTR_REPLACEMENT'
        INSTR_LEN_SANITY_CHECK(altinstr_len(num))
        ^
arch/s390/include/asm/alternative.h:66:3: note: expanded from macro
'INSTR_LEN_SANITY_CHECK'
        ".if (" len ") %% 2\n"                                          \
         ^
<inline asm>:8:5: note: instantiated into assembly here
.if (6651b-6641b) % 2
    ^
In file included from kernel/sched/cputime.c:5:
In file included from kernel/sched/sched.h:5:
In file included from include/linux/sched.h:14:
In file included from include/linux/pid.h:6:
In file included from include/linux/wait.h:9:
In file included from include/linux/spinlock.h:94:
arch/s390/include/asm/spinlock.h:89:3: error: cpu alternatives
instructions length is odd
                ALTERNATIVE("", ".long 0xb2fa0070", 49) /* NIAI 7 */
                ^

Reported-by: Linux Kernel Functional Testing <lkft@...aro.org>

# To install tuxmake on your system globally:
# sudo pip3 install -U tuxmake
#
# See https://docs.tuxmake.org/ for complete documentation.

tuxmake --runtime podman --target-arch s390 --toolchain clang-13
--kconfig defconfig

-- 
Linaro LKFT
https://lkft.linaro.org