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

[Steven Rostedt]

On Wed, 16 Jan 2019 16:32:58 -0800
Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx> 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@xxxxxxxxxxxxxxx>
> Cc: Masami Hiramatsu <mhiramat@xxxxxxxxxx>
> Cc: Daniel Borkmann <daniel@xxxxxxxxxxxxx>
> Cc: Alexei Starovoitov <ast@xxxxxxxxxx>
> Cc: Jessica Yu <jeyu@xxxxxxxxxx>
> Cc: Steven Rostedt <rostedt@xxxxxxxxxxx>
> Cc: Paul E. McKenney <paulmck@xxxxxxxxxxxxx>
> Signed-off-by: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>
> ---
>  arch/x86/kernel/ftrace.c       |  6 +--

For the ftrace code.

Acked-by: Steven Rostedt (VMware) <rostedt@xxxxxxxxxxx>

-- Steve

>  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(-)
>