On 8/1/2021 6:35 PM, ci_not...@linaro.org wrote:
Successfully identified regression in *linux* in CI configuration 
tcwg_kernel/llvm-release-aarch64-next-allmodconfig.  So far, this commit has 
regressed CI configurations:
  - tcwg_kernel/llvm-release-aarch64-next-allmodconfig

Culprit:
<cut>
commit 3d463dd5023b5a58b3c37207d65eeb5acbac2be3
Author: Krzysztof Kozlowski <krzysztof.kozlow...@canonical.com>
Date:   Thu Jul 29 12:40:19 2021 +0200

     nfc: fdp: constify several pointers
Several functions do not modify pointed data so arguments and local
     variables can be const for correctness and safety.  This allows also
     making file-scope nci_core_get_config_otp_ram_version array const.
Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlow...@canonical.com>
     Signed-off-by: David S. Miller <da...@davemloft.net>
</cut>

Results regressed to (for first_bad == 3d463dd5023b5a58b3c37207d65eeb5acbac2be3)
# reset_artifacts:
-10
# build_abe binutils:
-9
# build_llvm:
-5
# build_abe qemu:
-2
# linux_n_obj:
21802
# First few build errors in logs:
# 00:03:45 drivers/nfc/fdp/fdp.c:116:60: error: passing 'const char *' to 
parameter of type '__u8 *' (aka 'unsigned char *') discards qualifiers 
[-Werror,-Wincompatible-pointer-types-discards-qualifiers]
# 00:03:45 make[3]: *** [drivers/nfc/fdp/fdp.o] Error 1
# 00:03:49 make[2]: *** [drivers/nfc/fdp] Error 2
# 00:04:01 make[1]: *** [drivers/nfc] Error 2
# 00:09:25 make: *** [drivers] Error 2

I believe this should be fixed with the following series, which is now in netdev and should be in the next -next version:

https://lore.kernel.org/r/20210730144202.255890-1-krzysztof.kozlow...@canonical.com/

Cheers,
Nathan
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