[jolsa-perf:bpf/tramp_11 19/21] kernel/bpf/trampoline.c:81:31: sparse: sparse: non size-preserving pointer to integer cast

From: kernel test robot
Date: Thu Jun 23 2022 - 11:47:07 EST


tree: https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git bpf/tramp_11
head: c807110aa605281263da02a78af57847f5c4275e
commit: a2660a85cc98b2db2577fd844985884cff0e5cae [19/21] bpf: Add support to store multiple ids in bpf_tramp_id object
config: i386-randconfig-s002 (https://download.01.org/0day-ci/archive/20220623/202206232359.8QKWZqGN-lkp@xxxxxxxxx/config)
compiler: gcc-11 (Debian 11.3.0-3) 11.3.0
reproduce:
# apt-get install sparse
# sparse version: v0.6.4-31-g4880bd19-dirty
# https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git/commit/?id=a2660a85cc98b2db2577fd844985884cff0e5cae
git remote add jolsa-perf https://git.kernel.org/pub/scm/linux/kernel/git/jolsa/perf.git
git fetch --no-tags jolsa-perf bpf/tramp_11
git checkout a2660a85cc98b2db2577fd844985884cff0e5cae
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash kernel/bpf/

If you fix the issue, kindly add following tag where applicable
Reported-by: kernel test robot <lkp@xxxxxxxxx>


sparse warnings: (new ones prefixed by >>)
kernel/bpf/trampoline.c:16:31: sparse: sparse: symbol 'bpf_extension_verifier_ops' was not declared. Should it be static?
kernel/bpf/trampoline.c:18:27: sparse: sparse: symbol 'bpf_extension_prog_ops' was not declared. Should it be static?
>> kernel/bpf/trampoline.c:81:31: sparse: sparse: non size-preserving pointer to integer cast

vim +81 kernel/bpf/trampoline.c

77
78 static u64 bpf_tramp_id_key(struct bpf_tramp_id *id)
79 {
80 if (bpf_tramp_id_is_multi(id))
> 81 return (u64) &id;
82 else
83 return ((u64) id->obj_id << 32) | id->id[0];
84 }
85

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