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From: Steven Rostedt <>
To: Joel Fernandes <>
	Jessica Yu <>,,,
Subject: Re: [PATCH v3 3/3] module: Make __tracepoints_ptrs as read-only
Date: Wed, 10 Apr 2019 20:44:01 -0400	[thread overview]
Message-ID: <20190410204401.62f928ca@gandalf.local.home> (raw)
In-Reply-To: <>

On Wed, 10 Apr 2019 16:29:02 -0400
Joel Fernandes <> wrote:

> The srcu structure pointer array is modified at module load time because the
> array is fixed up by the module loader at load-time with the final locations
> of the tracepoints right?  Basically relocation fixups. At compile time, I
> believe it is not know what the values in the ptr array are. I believe same
> is true for the tracepoint ptrs array.
> Also it needs to be in a separate __tracepoint_ptrs so that this code works:
> 	mod->tracepoints_ptrs = section_objs(info, "__tracepoints_ptrs",
> 					     sizeof(*mod->tracepoints_ptrs),
> 					     &mod->num_tracepoints);
> #endif
> Did I  miss some point? Thanks,

But there's a lot of others too. Hmm, does this mean that the RO data
sections that are in modules are not set to RO?

There's a bunch of separate sections that are RO. Just look in
include/asm-generic/ under the RO_DATA_SECTION() macro.

A lot of the sections saved in module.c:find_module_sections() are in
that RO_DATA when compiled as a builtin. Are they not RO when loaded via
a module?

If this is the case, there probably is going to be a lot more sections
added to your list.

-- Steve

  reply	other threads:[~2019-04-11  0:44 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-04-10 19:57 [PATCH v3 1/3] module: Prepare for addition of new ro_after_init sections Joel Fernandes (Google)
2019-04-10 19:57 ` [PATCH v3 2/3] module: Make srcu_struct ptr array as read-only post init Joel Fernandes (Google)
2019-04-10 19:57 ` [PATCH v3 3/3] module: Make __tracepoints_ptrs as read-only Joel Fernandes (Google)
2019-04-10 20:11   ` Steven Rostedt
2019-04-10 20:29     ` Joel Fernandes
2019-04-11  0:44       ` Steven Rostedt [this message]
2019-04-11  8:21         ` Joel Fernandes
2019-04-11 13:19           ` Steven Rostedt
2019-04-11 20:06             ` Joel Fernandes
2019-04-11 13:44           ` Paul E. McKenney
2019-04-17 15:16         ` Jessica Yu
2019-04-17 15:36           ` Paul E. McKenney
2019-04-20 11:38           ` Joel Fernandes
2019-04-11  8:32 ` [PATCH v3 1/3] module: Prepare for addition of new ro_after_init sections Miroslav Benes
2019-04-17 13:29 ` Jessica Yu

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