linux-kernel - Re: ftrace bug

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Message-ID: <8bf3ddb5-e9fc-dcc9-ad7d-1677334f6386@broadcom.com>
Date:   Mon, 7 Mar 2022 13:00:05 +0100
From:   Arend van Spriel <arend.vanspriel@...adcom.com>
To:     Steven Rostedt <rostedt@...dmis.org>
Cc:     Ingo Molnar <mingo@...hat.com>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: ftrace bug

On 3/7/2022 12:26 PM, Arend van Spriel wrote:
> Hi Steven,
> 
> I wanted to use FTRACE on an ARM platform and I hit the following 
> warning which results in ftrace bug. This happens upon loading a module. 
> Looking up the warning I suspect the branch target is too far off. The 
> module is quite large and therefor not loaded in the modules section. Is 
> there a way to exclude a module. In ftrace_module_init I see a check for 
> !mod->num_ftrace_callsites. Is there a way to avoid creating ftrace 
> callsites in a module?

Could it be accomplished by this?

CFLAGS_REMOVE_lockdep.o = $(CC_FLAGS_FTRACE)

Regards,
Arend

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