Hi Gustavo,
First bad commit (maybe != root cause):
tree: https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git for-next/clang-fallthrough
head: 49e42c96f96bea335ea7f51af973804e8134afc4
commit: 49e42c96f96bea335ea7f51af973804e8134afc4 [2/2] Revert "Revert "Makefile: Enable -Wimplicit-fallthrough for Clang""
config: arm-randconfig-r021-20210723 (attached as .config)
compiler: clang version 13.0.0 (https://github.com/llvm/llvm-project 9625ca5b602616b2f5584e8a49ba93c52c141e40)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install arm cross compiling tool for clang build
# apt-get install binutils-arm-linux-gnueabi
# https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git/commit/?id=49e42c96f96bea335ea7f51af973804e8134afc4
git remote add gustavoars-linux https://git.kernel.org/pub/scm/linux/kernel/git/gustavoars/linux.git
git fetch --no-tags gustavoars-linux for-next/clang-fallthrough
git checkout 49e42c96f96bea335ea7f51af973804e8134afc4
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=arm
If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <[email protected]>
All warnings (new ones prefixed by >>):
>> arch/arm/mach-rpc/riscpc.c:52:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
default:
^
arch/arm/mach-rpc/riscpc.c:52:2: note: insert 'break;' to avoid fall-through
default:
^
break;
1 warning generated.
--
drivers/scsi/arm/acornscsi.c:2510:15: warning: no previous prototype for function 'acornscsi_queuecmd' [-Wmissing-prototypes]
DEF_SCSI_QCMD(acornscsi_queuecmd)
^
drivers/scsi/arm/acornscsi.c:2510:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
DEF_SCSI_QCMD(acornscsi_queuecmd)
^
static
include/scsi/scsi_host.h:514:2: note: expanded from macro 'DEF_SCSI_QCMD'
int func_name(struct Scsi_Host *shost, struct scsi_cmnd *cmd) \
^
drivers/scsi/arm/acornscsi.c:2612:5: warning: no previous prototype for function 'acornscsi_abort' [-Wmissing-prototypes]
int acornscsi_abort(struct scsi_cmnd *SCpnt)
^
drivers/scsi/arm/acornscsi.c:2612:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int acornscsi_abort(struct scsi_cmnd *SCpnt)
^
static
>> drivers/scsi/arm/acornscsi.c:2651:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
case res_success:
^
drivers/scsi/arm/acornscsi.c:2651:2: note: insert '__attribute__((fallthrough));' to silence this warning
case res_success:
^
__attribute__((fallthrough));
drivers/scsi/arm/acornscsi.c:2651:2: note: insert 'break;' to avoid fall-through
case res_success:
^
break;
drivers/scsi/arm/acornscsi.c:2693:5: warning: no previous prototype for function 'acornscsi_host_reset' [-Wmissing-prototypes]
int acornscsi_host_reset(struct scsi_cmnd *SCpnt)
^
drivers/scsi/arm/acornscsi.c:2693:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
int acornscsi_host_reset(struct scsi_cmnd *SCpnt)
^
static
drivers/scsi/arm/acornscsi.c:2741:31: warning: variable 'p' set but not used [-Wunused-but-set-variable]
static char string[100], *p;
^
drivers/scsi/arm/acornscsi.c:2739:7: warning: no previous prototype for function 'acornscsi_info' [-Wmissing-prototypes]
char *acornscsi_info(struct Scsi_Host *host)
^
drivers/scsi/arm/acornscsi.c:2739:1: note: declare 'static' if the function is not intended to be used outside of this translation unit
char *acornscsi_info(struct Scsi_Host *host)
^
6 warnings generated.
/tmp/acornscsi-cda313.s: Assembler messages:
/tmp/acornscsi-cda313.s:2634: Error: selected processor does not support `ldrh r0,[r0,#188]' in ARM mode
/tmp/acornscsi-cda313.s:3902: Error: selected processor does not support `ldrh r0,[r0,#188]' in ARM mode
/tmp/acornscsi-cda313.s:6008: Error: selected processor does not support `strh r0,[r4,#160]' in ARM mode
/tmp/acornscsi-cda313.s:6036: Error: selected processor does not support `strh r0,[r4,#160]' in ARM mode
/tmp/acornscsi-cda313.s:6041: Error: selected processor does not support `strheq r0,[r4,#160]' in ARM mode
/tmp/acornscsi-cda313.s:6158: Error: selected processor does not support `ldrh r1,[r9,#188]' in ARM mode
/tmp/acornscsi-cda313.s:6203: Error: selected processor does not support `ldrh r7,[r9,#188]' in ARM mode
/tmp/acornscsi-cda313.s:6787: Error: selected processor does not support `ldrh r0,[r10,#160]' in ARM mode
clang-13: error: assembler command failed with exit code 1 (use -v to see invocation)
--
>> drivers/scsi/arm/fas216.c:1379:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
default:
^
drivers/scsi/arm/fas216.c:1379:2: note: insert 'break;' to avoid fall-through
default:
^
break;
1 warning generated.
/tmp/fas216-a859e6.s: Assembler messages:
/tmp/fas216-a859e6.s:410: Error: selected processor does not support `ldrsb r1,[sp,#17]' in ARM mode
/tmp/fas216-a859e6.s:1424: Error: selected processor does not support `ldrh r2,[r3,#188]' in ARM mode
/tmp/fas216-a859e6.s:1441: Error: selected processor does not support `ldrh r0,[r3,#188]' in ARM mode
/tmp/fas216-a859e6.s:3694: Error: selected processor does not support `ldrh r0,[r8,#188]' in ARM mode
/tmp/fas216-a859e6.s:3711: Error: selected processor does not support `ldrh r2,[r8,#188]' in ARM mode
clang-13: error: assembler command failed with exit code 1 (use -v to see invocation)
--
>> drivers/scsi/arm/fas216.c:1379:2: warning: unannotated fall-through between switch labels [-Wimplicit-fallthrough]
default:
^
drivers/scsi/arm/fas216.c:1379:2: note: insert 'break;' to avoid fall-through
default:
^
break;
1 warning generated.
/tmp/fas216-86a903.s: Assembler messages:
/tmp/fas216-86a903.s:410: Error: selected processor does not support `ldrsb r1,[sp,#17]' in ARM mode
/tmp/fas216-86a903.s:1424: Error: selected processor does not support `ldrh r2,[r3,#188]' in ARM mode
/tmp/fas216-86a903.s:1441: Error: selected processor does not support `ldrh r0,[r3,#188]' in ARM mode
/tmp/fas216-86a903.s:3694: Error: selected processor does not support `ldrh r0,[r8,#188]' in ARM mode
/tmp/fas216-86a903.s:3711: Error: selected processor does not support `ldrh r2,[r8,#188]' in ARM mode
clang-13: error: assembler command failed with exit code 1 (use -v to see invocation)
Kconfig warnings: (for reference only)
WARNING: unmet direct dependencies detected for QCOM_SCM
Depends on (ARM || ARM64) && HAVE_ARM_SMCCC
Selected by
- ARM_QCOM_SPM_CPUIDLE && CPU_IDLE && (ARM || ARM64) && (ARCH_QCOM || COMPILE_TEST && !ARM64 && MMU
WARNING: unmet direct dependencies detected for ARM_CPU_SUSPEND
Depends on ARCH_SUSPEND_POSSIBLE
Selected by
- ARM_QCOM_SPM_CPUIDLE && CPU_IDLE && (ARM || ARM64) && (ARCH_QCOM || COMPILE_TEST && !ARM64 && MMU
vim +52 arch/arm/mach-rpc/riscpc.c
^1da177e4c3f41 Linus Torvalds 2005-04-16 40
^1da177e4c3f41 Linus Torvalds 2005-04-16 41 static int __init parse_tag_acorn(const struct tag *tag)
^1da177e4c3f41 Linus Torvalds 2005-04-16 42 {
^1da177e4c3f41 Linus Torvalds 2005-04-16 43 memc_ctrl_reg = tag->u.acorn.memc_control_reg;
^1da177e4c3f41 Linus Torvalds 2005-04-16 44 number_mfm_drives = tag->u.acorn.adfsdrives;
^1da177e4c3f41 Linus Torvalds 2005-04-16 45
^1da177e4c3f41 Linus Torvalds 2005-04-16 46 switch (tag->u.acorn.vram_pages) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 47 case 512:
^1da177e4c3f41 Linus Torvalds 2005-04-16 48 vram_size += PAGE_SIZE * 256;
df561f6688fef7 Gustavo A. R. Silva 2020-08-23 49 fallthrough; /* ??? */
^1da177e4c3f41 Linus Torvalds 2005-04-16 50 case 256:
^1da177e4c3f41 Linus Torvalds 2005-04-16 51 vram_size += PAGE_SIZE * 256;
^1da177e4c3f41 Linus Torvalds 2005-04-16 @52 default:
^1da177e4c3f41 Linus Torvalds 2005-04-16 53 break;
^1da177e4c3f41 Linus Torvalds 2005-04-16 54 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 55 #if 0
^1da177e4c3f41 Linus Torvalds 2005-04-16 56 if (vram_size) {
^1da177e4c3f41 Linus Torvalds 2005-04-16 57 desc->video_start = 0x02000000;
^1da177e4c3f41 Linus Torvalds 2005-04-16 58 desc->video_end = 0x02000000 + vram_size;
^1da177e4c3f41 Linus Torvalds 2005-04-16 59 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 60 #endif
^1da177e4c3f41 Linus Torvalds 2005-04-16 61 return 0;
^1da177e4c3f41 Linus Torvalds 2005-04-16 62 }
^1da177e4c3f41 Linus Torvalds 2005-04-16 63
:::::: The code at line 52 was first introduced by commit
:::::: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 Linux-2.6.12-rc2
:::::: TO: Linus Torvalds <[email protected]>
:::::: CC: Linus Torvalds <[email protected]>
---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/[email protected]