Re: [PATCH bpf-next 5/5] bpf: trampoline: support FTRACE_OPS_FL_SHARE_IPMODIFY
From: kernel test robot
Date: Wed Jun 01 2022 - 18:45:39 EST
Hi Song,
I love your patch! Perhaps something to improve:
[auto build test WARNING on bpf-next/master]
url: https://github.com/intel-lab-lkp/linux/commits/Song-Liu/ftrace-host-klp-and-bpf-trampoline-together/20220602-020112
base: https://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf-next.git master
config: i386-randconfig-a015 (https://download.01.org/0day-ci/archive/20220602/202206020622.HnFjEObo-lkp@xxxxxxxxx/config)
compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project c825abd6b0198fb088d9752f556a70705bc99dfd)
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
# https://github.com/intel-lab-lkp/linux/commit/7edcf1c49617641579f2bc36b86c7d59bea20aef
git remote add linux-review https://github.com/intel-lab-lkp/linux
git fetch --no-tags linux-review Song-Liu/ftrace-host-klp-and-bpf-trampoline-together/20220602-020112
git checkout 7edcf1c49617641579f2bc36b86c7d59bea20aef
# save the config file
mkdir build_dir && cp config build_dir/.config
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross W=1 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>
All warnings (new ones prefixed by >>):
>> kernel/bpf/trampoline.c:30:66: warning: declaration of 'enum ftrace_ops_cmd' will not be visible outside of this function [-Wvisibility]
static int bpf_tramp_ftrace_ops_func(struct ftrace_ops *op, enum ftrace_ops_cmd cmd);
^
kernel/bpf/trampoline.c:92:21: error: invalid application of 'sizeof' to an incomplete type 'struct ftrace_ops'
tr->fops = kzalloc(sizeof(struct ftrace_ops), GFP_KERNEL);
^ ~~~~~~~~~~~~~~~~~~~
include/linux/bpf.h:47:8: note: forward declaration of 'struct ftrace_ops'
struct ftrace_ops;
^
kernel/bpf/trampoline.c:100:10: error: incomplete definition of type 'struct ftrace_ops'
tr->fops->private = tr;
~~~~~~~~^
include/linux/bpf.h:47:8: note: forward declaration of 'struct ftrace_ops'
struct ftrace_ops;
^
kernel/bpf/trampoline.c:101:10: error: incomplete definition of type 'struct ftrace_ops'
tr->fops->ops_func = bpf_tramp_ftrace_ops_func;
~~~~~~~~^
include/linux/bpf.h:47:8: note: forward declaration of 'struct ftrace_ops'
struct ftrace_ops;
^
kernel/bpf/trampoline.c:397:11: error: incomplete definition of type 'struct ftrace_ops'
tr->fops->flags |= FTRACE_OPS_FL_SHARE_IPMODIFY;
~~~~~~~~^
include/linux/bpf.h:47:8: note: forward declaration of 'struct ftrace_ops'
struct ftrace_ops;
^
kernel/bpf/trampoline.c:397:22: error: use of undeclared identifier 'FTRACE_OPS_FL_SHARE_IPMODIFY'
tr->fops->flags |= FTRACE_OPS_FL_SHARE_IPMODIFY;
^
kernel/bpf/trampoline.c:415:11: error: incomplete definition of type 'struct ftrace_ops'
tr->fops->func = NULL;
~~~~~~~~^
include/linux/bpf.h:47:8: note: forward declaration of 'struct ftrace_ops'
struct ftrace_ops;
^
kernel/bpf/trampoline.c:416:11: error: incomplete definition of type 'struct ftrace_ops'
tr->fops->trampoline = 0;
~~~~~~~~^
include/linux/bpf.h:47:8: note: forward declaration of 'struct ftrace_ops'
struct ftrace_ops;
^
kernel/bpf/trampoline.c:431:67: warning: declaration of 'enum ftrace_ops_cmd' will not be visible outside of this function [-Wvisibility]
static int bpf_tramp_ftrace_ops_func(struct ftrace_ops *ops, enum ftrace_ops_cmd cmd)
^
kernel/bpf/trampoline.c:431:12: error: conflicting types for 'bpf_tramp_ftrace_ops_func'
static int bpf_tramp_ftrace_ops_func(struct ftrace_ops *ops, enum ftrace_ops_cmd cmd)
^
kernel/bpf/trampoline.c:30:12: note: previous declaration is here
static int bpf_tramp_ftrace_ops_func(struct ftrace_ops *op, enum ftrace_ops_cmd cmd);
^
kernel/bpf/trampoline.c:431:82: error: variable has incomplete type 'enum ftrace_ops_cmd'
static int bpf_tramp_ftrace_ops_func(struct ftrace_ops *ops, enum ftrace_ops_cmd cmd)
^
kernel/bpf/trampoline.c:431:67: note: forward declaration of 'enum ftrace_ops_cmd'
static int bpf_tramp_ftrace_ops_func(struct ftrace_ops *ops, enum ftrace_ops_cmd cmd)
^
kernel/bpf/trampoline.c:433:33: error: incomplete definition of type 'struct ftrace_ops'
struct bpf_trampoline *tr = ops->private;
~~~^
include/linux/bpf.h:47:8: note: forward declaration of 'struct ftrace_ops'
struct ftrace_ops;
^
kernel/bpf/trampoline.c:448:7: error: use of undeclared identifier 'FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY'
case FTRACE_OPS_CMD_ENABLE_SHARE_IPMODIFY:
^
kernel/bpf/trampoline.c:452:7: error: use of undeclared identifier 'FTRACE_OPS_CMD_DISABLE_SHARE_IPMODIFY'
case FTRACE_OPS_CMD_DISABLE_SHARE_IPMODIFY:
^
kernel/bpf/trampoline.c:454:11: error: incomplete definition of type 'struct ftrace_ops'
tr->fops->flags &= ~FTRACE_OPS_FL_SHARE_IPMODIFY;
~~~~~~~~^
include/linux/bpf.h:47:8: note: forward declaration of 'struct ftrace_ops'
struct ftrace_ops;
^
kernel/bpf/trampoline.c:454:23: error: use of undeclared identifier 'FTRACE_OPS_FL_SHARE_IPMODIFY'
tr->fops->flags &= ~FTRACE_OPS_FL_SHARE_IPMODIFY;
^
2 warnings and 14 errors generated.
vim +30 kernel/bpf/trampoline.c
29
> 30 static int bpf_tramp_ftrace_ops_func(struct ftrace_ops *op, enum ftrace_ops_cmd cmd);
31
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