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SubjectRe: [PATCH 16/17] Plug in new special vfree flag
On Wed, 16 Jan 2019 16:32:58 -0800
Rick Edgecombe <rick.p.edgecombe@intel.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@rustcorp.com.au>
> 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 <paulmck@linux.ibm.com>
> 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

> 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(-)
>

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