linux-kernel - Re: [PATCH 16/17] Plug in new special vfree flag

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Date:   Thu, 7 Feb 2019 17:33:37 +0000
From:   "Edgecombe, Rick P" <rick.p.edgecombe@...el.com>
To:     "rostedt@...dmis.org" <rostedt@...dmis.org>
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Subject: Re: [PATCH 16/17] Plug in new special vfree flag

On Wed, 2019-02-06 at 11:23 -0500, Steven Rostedt wrote:
> On Wed, 16 Jan 2019 16:32:58 -0800
> Rick Edgecombe <rick.p.edgecombe@...el.com> wrote:
> 
> > Add new flag for handling freeing of special permissioned memory in vmalloc
> > and remove places where memory was set RW before freeing which is no longer
> > needed.
> > 
> > In kprobes, bpf and ftrace this just adds the flag, and removes the now
> > unneeded set_memory_ calls before calling vfree.
> > 
> > In modules, the freeing of init sections is moved to a work queue, since
> > freeing of RO memory is not supported in an interrupt by vmalloc.
> > Instead of call_rcu, it now uses synchronize_rcu() in the work queue.
> > 
> > Cc: Rusty Russell <rusty@...tcorp.com.au>
> > Cc: Masami Hiramatsu <mhiramat@...nel.org>
> > Cc: Daniel Borkmann <daniel@...earbox.net>
> > Cc: Alexei Starovoitov <ast@...nel.org>
> > Cc: Jessica Yu <jeyu@...nel.org>
> > Cc: Steven Rostedt <rostedt@...dmis.org>
> > Cc: Paul E. McKenney <paulmck@...ux.ibm.com>
> > Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
> > ---
> >  arch/x86/kernel/ftrace.c       |  6 +--
> 
> For the ftrace code.
> 
> Acked-by: Steven Rostedt (VMware) <rostedt@...dmis.org>
> 
> -- Steve
> 
Thanks!

Rick
> >  arch/x86/kernel/kprobes/core.c |  7 +---
> >  include/linux/filter.h         | 16 ++-----
> >  kernel/bpf/core.c              |  1 -
> >  kernel/module.c                | 77 +++++++++++++++++-----------------
> >  5 files changed, 45 insertions(+), 62 deletions(-)
> >