Subject: Re: [linux-next:master] BUILD REGRESSION 21ef7b1e17d039053edaeaf41142423810572741

From: Martin KaFai Lau <[email-masked]>
Date: Wed, 9 Aug 2023 16:31:10 -0700

On 8/9/23 11:29 AM, kernel test robot wrote:
> Unverified Error/Warning (likely false positive, please contact us if interested):
> 
> drivers/block/ublk_drv.c:445 ublk_setup_iod_zoned() warn: signedness bug returning '(-95)'
> drivers/gpu/drm/tests/drm_exec_test.c:166 test_prepare_array() error: uninitialized symbol 'ret'.
> drivers/input/touchscreen/iqs7211.c:1761 iqs7211_parse_cycles() error: buffer overflow 'cycle_alloc[0]' 2 <= 41
> drivers/regulator/max77857-regulator.c:430:28: sparse: sparse: symbol 'max77857_id' was not declared. Should it be static?
> drivers/soundwire/qcom.c:905:22-23: WARNING opportunity for min()
> drivers/video/fbdev/core/fb_chrdev.c:239 do_fscreeninfo_to_user() warn: ignoring unreachable code.
> kernel/workqueue.c:324:40: sparse: sparse: duplicate [noderef]
> kernel/workqueue.c:324:40: sparse: sparse: multiple address spaces given: __percpu & __rcu
> mm/khugepaged.c:2138 collapse_file() warn: variable dereferenced before check 'cc' (see line 1787)
> net/xdp/xsk.c:696 xsk_build_skb() error: 'skb' dereferencing possible ERR_PTR()

Maciej and Tirthendu, the report on xsk looks legit and may be related to commit 
cf24f5a5feea ("xsk: add support for AF_XDP multi-buffer on Tx path"). Please 
help to take a look. Thanks.