linux-kernel - Re: [PATCH v21 05/20] fprobe: Use ftrace

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Message-Id: <20241226110848.3d95040586e4f5c71ec65a3d@kernel.org>
Date: Thu, 26 Dec 2024 11:08:48 +0900
From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
To: Steven Rostedt <rostedt@...dmis.org>
Cc: Alexei Starovoitov <alexei.starovoitov@...il.com>, Florent Revest
 <revest@...omium.org>, linux-trace-kernel@...r.kernel.org, LKML
 <linux-kernel@...r.kernel.org>, Martin KaFai Lau <martin.lau@...ux.dev>,
 bpf <bpf@...r.kernel.org>, Alexei Starovoitov <ast@...nel.org>, Jiri Olsa
 <jolsa@...nel.org>, Alan Maguire <alan.maguire@...cle.com>, Mark Rutland
 <mark.rutland@....com>, linux-arch@...r.kernel.org
Subject: Re: [PATCH v21 05/20] fprobe: Use ftrace_regs in fprobe entry
 handler

On Mon, 23 Dec 2024 16:42:38 -0500
Steven Rostedt <rostedt@...dmis.org> wrote:

> On Tue, 10 Dec 2024 11:09:52 +0900
> "Masami Hiramatsu (Google)" <mhiramat@...nel.org> wrote:
> 
> > From: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> > 
> > This allows fprobes to be available with CONFIG_DYNAMIC_FTRACE_WITH_ARGS
> > instead of CONFIG_DYNAMIC_FTRACE_WITH_REGS, then we can enable fprobe
> > on arm64.
> > 
> > Signed-off-by: Masami Hiramatsu (Google) <mhiramat@...nel.org>
> 
> Hmm, my build failed on this patch. Perhaps I screwed up the rebase to v6.13-rc4?

Oops, no. That is a bug, which is fixed in [9/20]. Let me fix it.

Thanks!

> 
> Config attached:
> 
> [3 seconds] SUCCESS
> make O=/work/build/nobackup/tracetest -j50 ... make[1]: Entering directory '/work/build/nobackup/tracetest'
>   SYNC    include/config/auto.conf.cmd
>   GEN     Makefile
>   GEN     Makefile
> mkdir -p /work/build/nobackup/tracetest/tools/objtool && make O=/work/build/nobackup/tracetest subdir=tools/objtool --no-print-directory -C objtool
>   UPD     include/config/kernel.release
>   UPD     include/generated/utsrelease.h
>   INSTALL libsubcmd_headers
>   CALL    /work/build/trace/nobackup/linux-test.git/scripts/checksyscalls.sh
>   CC      init/version.o
>   CC      net/sched/sch_generic.o
>   CC      drivers/base/firmware_loader/main.o
>   CC      security/integrity/ima/ima_init.o
>   CC      kernel/sys.o
>   CC      kernel/module/main.o
>   CC      drivers/gpu/drm/drm_vblank.o
>   CC      kernel/time/time.o
>   AR      init/built-in.a
>   CC      drivers/gpu/drm/ttm/ttm_bo.o
>   CC      drivers/gpu/drm/ttm/ttm_bo_util.o
>   CC      drivers/gpu/drm/qxl/qxl_ttm.o
>   CC      kernel/trace/bpf_trace.o
>   CC      kernel/trace/fprobe.o
>   CC      kernel/trace/trace_fprobe.o
>   AR      security/integrity/ima/built-in.a
>   AR      security/integrity/built-in.a
>   AR      security/built-in.a
> /work/build/trace/nobackup/linux-test.git/kernel/trace/trace_fprobe.c: In function ‘__trace_fprobe_create’:
> /work/build/trace/nobackup/linux-test.git/kernel/trace/trace_fprobe.c:1223:38: error: assignment to ‘fprobe_entry_cb’ {aka ‘int (*)(struct fprobe *, long unsigned int,  long unsigned int,  struct ftrace_regs *, void *)’} from incompatible pointer type ‘int (*)(struct fpro
> be *, long unsigned int,  long unsigned int,  struct pt_regs *, void *)’ [-Wincompatible-pointer-types]
>  1223 |                 tf->fp.entry_handler = trace_fprobe_entry_handler;
>       |                                      ^
> make[5]: *** [/work/build/trace/nobackup/linux-test.git/scripts/Makefile.build:194: kernel/trace/trace_fprobe.o] Error 1
> make[5]: *** Waiting for unfinished jobs....
>   AR      drivers/gpu/drm/qxl/built-in.a
>   AR      drivers/base/firmware_loader/built-in.a
>   AR      drivers/base/built-in.a
>   AR      kernel/time/built-in.a
>   AR      drivers/gpu/drm/ttm/built-in.a
>   AR      drivers/gpu/drm/built-in.a
>   AR      drivers/gpu/built-in.a
>   AR      drivers/built-in.a
>   AR      net/sched/built-in.a
>   AR      net/built-in.a
>   AR      kernel/module/built-in.a
> make[4]: *** [/work/build/trace/nobackup/linux-test.git/scripts/Makefile.build:440: kernel/trace] Error 2
> make[3]: *** [/work/build/trace/nobackup/linux-test.git/scripts/Makefile.build:440: kernel] Error 2
> make[2]: *** [/work/build/trace/nobackup/linux-test.git/Makefile:1989: .] Error 2
> make[1]: *** [/work/build/trace/nobackup/linux-test.git/Makefile:251: __sub-make] Error 2
> make[1]: Leaving directory '/work/build/nobackup/tracetest'
> make: *** [Makefile:251: __sub-make] Error 2
> [10 seconds] FAILED!
> make O=/work/build/nobackup/tracetest kernelrelease ... 6.13.0-rc4-test-00005-g21a983830d78-dirty
> ssh -t root@...cetest 'rm -rf /lib/modules/*-test*'; git reset --hard ... HEAD is now at 21a983830d78 fprobe: Use ftrace_regs in fprobe entry handler
> [1 second] SUCCESS
> CRITICAL FAILURE... [TEST 3] failed build
> 
> -- Steve


-- 
Masami Hiramatsu (Google) <mhiramat@...nel.org>