On Wed, 2019-02-06 at 11:23 -0500, Steven Rostedt wrote:

On Wed, 16 Jan 2019 16:32:58 -0800
Rick Edgecombe [off-list ref] wrote:

quoted

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 <redacted>
Cc: Masami Hiramatsu <mhiramat@kernel.org>
Cc: Daniel Borkmann <daniel@iogearbox.net>
Cc: Alexei Starovoitov <ast@kernel.org>
Cc: Jessica Yu <jeyu@kernel.org>
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Paul E. McKenney <redacted>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
---
 arch/x86/kernel/ftrace.c       |  6 +--

For the ftrace code.

Acked-by: Steven Rostedt (VMware) <rostedt@goodmis.org>

-- Steve

Thanks!

Rick

quoted

 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(-)