linux-kernel - Re: [PATCH v1 2/2] powerpc/debug: hook to user return notifier infrastructure

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Message-ID: <DD7156ED36F34F8E+ZtV4kSBA-XH1f8NS@HX09040029.powercore.com.cn>
Date: Mon, 2 Sep 2024 16:34:25 +0800
From: Luming Yu <luming.yu@...ngroup.cn>
To: Christophe Leroy <christophe.leroy@...roup.eu>
Cc: "shenghui.qu@...ngroup.cn" <shenghui.qu@...ngroup.cn>,
	npiggin <npiggin@...il.com>,
	"Aneesh Kumar K.V" <aneesh.kumar@...nel.org>,
	mpe <mpe@...erman.id.au>, "luming.yu" <luming.yu@...il.com>,
	杨佳龙 <jialong.yang@...ngroup.cn>,
	linuxppc-dev <linuxppc-dev@...ts.ozlabs.org>,
	linux-kernel <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1 2/2] powerpc/debug: hook to user return notifier
 infrastructure

Wed, Aug 28, 2024 at 09:27:23AM +0200, Christophe Leroy wrote:
> 
> 
> Le 28/08/2024 à 08:50, Luming Yu a écrit :
> > On Wed, Aug 28, 2024 at 07:46:52AM +0200, Christophe Leroy wrote:
> > > Hi,
> > > 
> > > Le 28/08/2024 à 05:17, 虞陆铭 a écrit :
> > > > Hi,
> > > > 
> > > > it appears the little feature might require a little bit more work to find its value of the patch.
> > > > 
> > > > Using the following debug module ,  some debugging shows the TIF_USER_RETURN_NOTIFY
> > > > bit is propagated in __switch_to among tasks , but USER_RETURN_NOTIFY call back seems to
> > > > be dropped somewhere on somone who carries the bit return to user space.
> > > > side notes:
> > > > there is an issue that the module symbols is not appended to /sys/kernel/debug/tracing/available_filter_functions
this is not a problem as I just noticed that lib/Makefile carries this magic
ccflags-remove-$(CONFIG_FUNCTION_TRACER) += $(CC_FLAGS_FTRACE)