linux-kernel - Re: [PATCH v3 8/8] x86/ftrace: enable EXECMEM_ROX

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Message-ID: <20250821152509.391c1ebe@gandalf.local.home>
Date: Thu, 21 Aug 2025 15:25:09 -0400
From: Steven Rostedt <rostedt@...dmis.org>
To: Mike Rapoport <rppt@...nel.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>, Andy Lutomirski
 <luto@...nel.org>, Borislav Petkov <bp@...en8.de>, Christophe Leroy
 <christophe.leroy@...roup.eu>, Daniel Gomez <da.gomez@...sung.com>, Dave
 Hansen <dave.hansen@...ux.intel.com>, Ingo Molnar <mingo@...hat.com>, "Liam
 R. Howlett" <Liam.Howlett@...cle.com>, Luis Chamberlain
 <mcgrof@...nel.org>, Mark Rutland <mark.rutland@....com>, Masami Hiramatsu
 <mhiramat@...nel.org>, "H. Peter Anvin" <hpa@...or.com>, Peter Zijlstra
 <peterz@...radead.org>, Petr Pavlu <petr.pavlu@...e.com>, Sami Tolvanen
 <samitolvanen@...gle.com>, Thomas Gleixner <tglx@...utronix.de>, Yann
 Ylavic <ylavic.dev@...il.com>, linux-kernel@...r.kernel.org,
 linux-mm@...ck.org, linux-modules@...r.kernel.org,
 linux-trace-kernel@...r.kernel.org, x86@...nel.org
Subject: Re: [PATCH v3 8/8] x86/ftrace: enable EXECMEM_ROX_CACHE for ftrace
 allocations

On Thu, 21 Aug 2025 09:11:46 +0300
Mike Rapoport <rppt@...nel.org> wrote:

> maple tree is initialized after ftrace, so the patch below should fix it:
> 
> diff --git a/init/main.c b/init/main.c
> index 0ee0ee7b7c2c..5753e9539ae6 100644
> --- a/init/main.c
> +++ b/init/main.c
> @@ -956,6 +956,7 @@ void start_kernel(void)
>  	sort_main_extable();
>  	trap_init();
>  	mm_core_init();
> +	maple_tree_init();
>  	poking_init();
>  	ftrace_init();
>  
> @@ -973,7 +974,6 @@ void start_kernel(void)
>  		 "Interrupts were enabled *very* early, fixing it\n"))
>  		local_irq_disable();
>  	radix_tree_init();
> -	maple_tree_init();
>  
>  	/*
>  	 * Set up housekeeping before setting up workqueues to allow the unbound
>  

Tested-by: Steven Rostedt (Google) <rostedt@...dmis.org>

Thanks,

-- Steve