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Message-ID: <CADYN=9JnzPC6Ja9s3_01k-CDTSuxKBMRdrqU5rqp0xw1r9XpRw@mail.gmail.com>
Date: Mon, 6 Jul 2020 13:24:05 +0200
From: Anders Roxell <anders.roxell@...aro.org>
To: Masahiro Yamada <masahiroy@...nel.org>
Cc: Michael Ellerman <mpe@...erman.id.au>,
Linux Kbuild mailing list <linux-kbuild@...r.kernel.org>,
Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
Sami Tolvanen <samitolvanen@...gle.com>,
Benjamin Herrenschmidt <benh@...nel.crashing.org>,
Ingo Molnar <mingo@...hat.com>,
Michal Marek <michal.lkml@...kovi.net>,
Paul Mackerras <paulus@...ba.org>,
Rich Felker <dalias@...c.org>,
Russell King <linux@...linux.org.uk>,
Steven Rostedt <rostedt@...dmis.org>,
Yoshinori Sato <ysato@...rs.sourceforge.jp>,
linux-arm-kernel <linux-arm-kernel@...ts.infradead.org>,
Linux-sh list <linux-sh@...r.kernel.org>,
linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>
Subject: Re: [PATCH] kbuild: introduce ccflags-remove-y and asflags-remove-y
Hi,
When I built an allmodconfig kernel for arm64, and boot that in qemu
guest I see the following issues:
[...]
[ 10.451561][ T1] Testing tracer function: PASSED
[ 33.087895][ T1] Testing dynamic ftrace: .. filter did not
filter .. FAILED!
[ 51.127094][ T1] ------------[ cut here ]------------
[ 51.132387][ T1] WARNING: CPU: 0 PID: 1 at
kernel/trace/trace.c:1814 run_tracer_selftest+0x314/0x40c
[ 51.140805][ T1] Modules linked in:
[ 51.145398][ T1] CPU: 0 PID: 1 Comm: swapper/0 Not tainted
5.8.0-rc3-next-20200703-00004-g8cd4bc531754 #1
[ 51.154146][ T1] Hardware name: linux,dummy-virt (DT)
[ 51.159536][ T1] pstate: 80400005 (Nzcv daif +PAN -UAO BTYPE=--)
[ 51.165711][ T1] pc : run_tracer_selftest+0x314/0x40c
[ 51.171167][ T1] lr : run_tracer_selftest+0x308/0x40c
[ 51.176475][ T1] sp : ffff000069c07c40
[ 51.180855][ T1] x29: ffff000069c07c40 x28: ffffa00015e80320
[ 51.187187][ T1] x27: ffffa00013e074a0 x26: ffffa000150f22ee
[ 51.193520][ T1] x25: ffffa000125b35a0 x24: ffffa00013f6a000
[ 51.199868][ T1] x23: ffffa00013f6adc0 x22: 00000000ffffffff
[ 51.206225][ T1] x21: ffffa000150f2250 x20: ffffa00015e801c0
[ 51.212582][ T1] x19: ffffa00015e7fa80 x18: 0000000000002750
[ 51.218887][ T1] x17: 00000000000014c0 x16: 00000000000016f0
[ 51.225229][ T1] x15: 00000000000014f8 x14: ffffa0001000a3c8
[ 51.231584][ T1] x13: ffffa000124a5fb8 x12: ffff80000d494822
[ 51.237935][ T1] x11: 1fffe0000d494821 x10: ffff80000d494821
[ 51.244293][ T1] x9 : ffffa000101763b0 x8 : ffff000069c077d7
[ 51.250704][ T1] x7 : 0000000000000001 x6 : ffff000069c077d0
[ 51.257060][ T1] x5 : ffff00006a7fc040 x4 : 0000000000000000
[ 51.263423][ T1] x3 : ffffa00010211118 x2 : 8af0509000018b00
[ 51.269757][ T1] x1 : 0000000000000000 x0 : 0000000000000001
[ 51.276084][ T1] Call trace:
[ 51.279934][ T1] run_tracer_selftest+0x314/0x40c
[ 51.285174][ T1] init_trace_selftests+0x110/0x31c
[ 51.290391][ T1] do_one_initcall+0x410/0x960
[ 51.295315][ T1] kernel_init_freeable+0x430/0x4f0
[ 51.300595][ T1] kernel_init+0x20/0x1d8
[ 51.305180][ T1] ret_from_fork+0x10/0x18
[ 51.309741][ T1] irq event stamp: 1401832
[ 51.314399][ T1] hardirqs last enabled at (1401831):
[<ffffa0001020d10c>] console_unlock+0xc04/0xd10
[ 51.322973][ T1] hardirqs last disabled at (1401832):
[<ffffa00010050fe4>] debug_exception_enter+0xbc/0x200
[ 51.331993][ T1] softirqs last enabled at (1401828):
[<ffffa000100023a4>] __do_softirq+0x95c/0x9f8
[ 51.340490][ T1] softirqs last disabled at (1401821):
[<ffffa0001010f7d0>] irq_exit+0x118/0x198
[ 51.348717][ T1] _warn_unseeded_randomness: 5 callbacks suppressed
[ 51.349263][ T1] random: get_random_bytes called from
print_oops_end_marker+0x48/0x80 with crng_init=0
[ 51.350502][ T1] ---[ end trace c566e8a71c933d3c ]---
[...]
[40709.672335][ C0] pool 2: cpus=0 flags=0x5 nice=0 hung=3s
workers=3 manager: 1455
[40739.960593][ T26] INFO: lockdep is turned off.
[40775.312499][ T26] Kernel panic - not syncing: hung_task: blocked tasks
[40775.341521][ T26] CPU: 0 PID: 26 Comm: khungtaskd Tainted: G
W 5.8.0-rc3-next-20200703-00004-g8cd4bc531754 #1
[40775.352848][ T26] Hardware name: linux,dummy-virt (DT)
[40775.359304][ T26] Call trace:
[40775.364148][ T26] dump_backtrace+0x0/0x418
[40775.369918][ T26] show_stack+0x34/0x48
[40775.375468][ T26] dump_stack+0x1f4/0x2b0
[40775.381136][ T26] panic+0x2dc/0x6ec
[40775.386430][ T26] watchdog+0x1400/0x1460
[40775.392103][ T26] kthread+0x23c/0x250
[40775.397548][ T26] ret_from_fork+0x10/0x18
[40775.407039][ T26] Kernel Offset: disabled
[40775.412634][ T26] CPU features: 0x240002,20002004
[40775.418751][ T26] Memory Limit: none
[40775.425823][ T26] ---[ end Kernel panic - not syncing: hung_task:
blocked tasks ]---
The full log can be found here [1].
Without this patch for 'trace_selftest_dynamic' for instance, CC_FLAGS_FTRACE
was removed from kernel/trace/*, and then added back to
kernel/trace/trace_selftest_dynamic.
While with this patch it looks like we add the flag (even though it is
already there), and then
removes the flag for all files in kernel/trace/* .
Cheers,
Anders
[1] https://people.linaro.org/~anders.roxell/output-next-20200703.log
On Tue, 30 Jun 2020 at 04:09, Masahiro Yamada <masahiroy@...nel.org> wrote:
>
> On Mon, Jun 29, 2020 at 2:55 PM Michael Ellerman <mpe@...erman.id.au> wrote:
> >
> > Masahiro Yamada <masahiroy@...nel.org> writes:
> > > CFLAGS_REMOVE_<file>.o works per object, that is, there is no
> > > convenient way to filter out flags for every object in a directory.
> > >
> > > Add ccflags-remove-y and asflags-remove-y to make it easily.
> > >
> > > Use ccflags-remove-y to clean up some Makefiles.
> > >
> > > Suggested-by: Sami Tolvanen <samitolvanen@...gle.com>
> > > Signed-off-by: Masahiro Yamada <masahiroy@...nel.org>
> > > ---
> > >
> > > arch/arm/boot/compressed/Makefile | 6 +-----
> > > arch/powerpc/xmon/Makefile | 3 +--
> > > arch/sh/boot/compressed/Makefile | 5 +----
> > > kernel/trace/Makefile | 4 ++--
> > > lib/Makefile | 5 +----
> > > scripts/Makefile.lib | 4 ++--
> > > 6 files changed, 8 insertions(+), 19 deletions(-)
> > >
> > > diff --git a/arch/powerpc/xmon/Makefile b/arch/powerpc/xmon/Makefile
> > > index 89c76ca35640..55cbcdd88ac0 100644
> > > --- a/arch/powerpc/xmon/Makefile
> > > +++ b/arch/powerpc/xmon/Makefile
> > > @@ -7,8 +7,7 @@ UBSAN_SANITIZE := n
> > > KASAN_SANITIZE := n
> > >
> > > # Disable ftrace for the entire directory
> > > -ORIG_CFLAGS := $(KBUILD_CFLAGS)
> > > -KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))
> > > +ccflags-remove-y += $(CC_FLAGS_FTRACE)
> >
> > This could be:
> >
> > ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
> >
> > Similar to kernel/trace/Makefile below.
>
>
> I fixed it up, and applied to linux-kbuild.
> Thanks.
>
>
> > I don't mind though.
> >
> > Acked-by: Michael Ellerman <mpe@...erman.id.au> (powerpc)
> >
> > cheers
> >
> > > diff --git a/kernel/trace/Makefile b/kernel/trace/Makefile
> > > index 6575bb0a0434..7492844a8b1b 100644
> > > --- a/kernel/trace/Makefile
> > > +++ b/kernel/trace/Makefile
> > > @@ -2,9 +2,9 @@
> > >
> > > # Do not instrument the tracer itself:
> > >
> > > +ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)
> > > +
> > > ifdef CONFIG_FUNCTION_TRACER
> > > -ORIG_CFLAGS := $(KBUILD_CFLAGS)
> > > -KBUILD_CFLAGS = $(subst $(CC_FLAGS_FTRACE),,$(ORIG_CFLAGS))
> > >
> > > # Avoid recursion due to instrumentation.
> > > KCSAN_SANITIZE := n
>
>
>
> --
> Best Regards
> Masahiro Yamada
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