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Message-ID: <202210121917.Try2qX7S-lkp@intel.com>
Date: Wed, 12 Oct 2022 19:34:13 +0800
From: kernel test robot <lkp@...el.com>
To: Mark Rutland <mark.rutland@....com>
Cc: kbuild-all@...ts.01.org, linux-kernel@...r.kernel.org
Subject: [mark:arm64/ftrace/minimal-regs 2/5]
arch/x86/include/asm/ftrace.h:47:32: error: implicit declaration of function
'ftrace_get_regs'
Hi Mark,
FYI, the error/warning was bisected to this commit, please ignore it if it's irrelevant.
tree: https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git arm64/ftrace/minimal-regs
head: 1e840c7ba731d3b9fe5d23a41b3744fa8999ec1e
commit: cfc377737ee03317682a153342d7f30427204591 [2/5] ftrace: pass fregs to arch_ftrace_set_direct_caller()
config: x86_64-rhel-8.3-kselftests
compiler: gcc-11 (Debian 11.3.0-5) 11.3.0
reproduce (this is a W=1 build):
# https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git/commit/?id=cfc377737ee03317682a153342d7f30427204591
git remote add mark https://git.kernel.org/pub/scm/linux/kernel/git/mark/linux.git
git fetch --no-tags mark arm64/ftrace/minimal-regs
git checkout cfc377737ee03317682a153342d7f30427204591
# save the config file
mkdir build_dir && cp config build_dir/.config
make W=1 O=build_dir ARCH=x86_64 prepare
If you fix the issue, kindly add following tag where applicable
| Reported-by: kernel test robot <lkp@...el.com>
All errors (new ones prefixed by >>):
In file included from include/linux/ftrace.h:23,
from include/linux/kvm_host.h:32,
from arch/x86/kernel/../kvm/vmx/vmx.h:5,
from arch/x86/kernel/asm-offsets.c:22:
arch/x86/include/asm/ftrace.h:45:57: warning: 'struct ftrace_regs' declared inside parameter list will not be visible outside of this definition or declaration
45 | static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr)
| ^~~~~~~~~~~
arch/x86/include/asm/ftrace.h: In function 'arch_ftrace_set_direct_caller':
>> arch/x86/include/asm/ftrace.h:47:32: error: implicit declaration of function 'ftrace_get_regs' [-Werror=implicit-function-declaration]
47 | struct pt_regs *regs = ftrace_get_regs(fregs);
| ^~~~~~~~~~~~~~~
arch/x86/include/asm/ftrace.h:47:32: warning: initialization of 'struct pt_regs *' from 'int' makes pointer from integer without a cast [-Wint-conversion]
In file included from include/linux/kvm_host.h:32,
from arch/x86/kernel/../kvm/vmx/vmx.h:5,
from arch/x86/kernel/asm-offsets.c:22:
include/linux/ftrace.h: At top level:
>> include/linux/ftrace.h:121:40: error: conflicting types for 'ftrace_get_regs'; have 'struct pt_regs *(struct ftrace_regs *)'
121 | static __always_inline struct pt_regs *ftrace_get_regs(struct ftrace_regs *fregs)
| ^~~~~~~~~~~~~~~
In file included from include/linux/ftrace.h:23,
from include/linux/kvm_host.h:32,
from arch/x86/kernel/../kvm/vmx/vmx.h:5,
from arch/x86/kernel/asm-offsets.c:22:
arch/x86/include/asm/ftrace.h:47:32: note: previous implicit declaration of 'ftrace_get_regs' with type 'int()'
47 | struct pt_regs *regs = ftrace_get_regs(fregs);
| ^~~~~~~~~~~~~~~
cc1: some warnings being treated as errors
make[2]: *** [scripts/Makefile.build:117: arch/x86/kernel/asm-offsets.s] Error 1
make[2]: Target '__build' not remade because of errors.
make[1]: *** [Makefile:1205: prepare0] Error 2
make[1]: Target 'prepare' not remade because of errors.
make: *** [Makefile:222: __sub-make] Error 2
make: Target 'prepare' not remade because of errors.
vim +/ftrace_get_regs +47 arch/x86/include/asm/ftrace.h
37
38 /*
39 * When a ftrace registered caller is tracing a function that is
40 * also set by a register_ftrace_direct() call, it needs to be
41 * differentiated in the ftrace_caller trampoline. To do this, we
42 * place the direct caller in the ORIG_AX part of pt_regs. This
43 * tells the ftrace_caller that there's a direct caller.
44 */
> 45 static inline void arch_ftrace_set_direct_caller(struct ftrace_regs *fregs, unsigned long addr)
46 {
> 47 struct pt_regs *regs = ftrace_get_regs(fregs);
48
49 /* Emulate a call */
50 regs->orig_ax = addr;
51 }
52
--
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