Thread (82 messages) 82 messages, 10 authors, 2018-02-13

Re: [PATCH 17/18] tracing: Add indirect to indirect access for function based events

From: Namhyung Kim <namhyung@kernel.org>
Date: 2018-02-13 09:27:45
Also in: lkml

Hi Steve,

On Mon, Feb 12, 2018 at 12:23:54PM -0500, Steven Rostedt wrote:
On Mon, 12 Feb 2018 11:15:34 +0900
Namhyung Kim [off-list ref] wrote:
quoted
quoted
It should have been:

		return process_redirects(arg, val, buf);  
But I think you need to consider data type of the arg when
dereferencing the last redirect.
What for?
Otherwise it'd return a value of unsigned long type regardless of the
type of the arg.  I thought it should have same logic as indirect
args.

But it seems not matter since record_entry() would copy it only for
the arg->size.  Then type check in __get_arg() might be unnecessary
too.
Also this code has also changed. I haven't posted new patches but my
latest is in my git tree in the branch ftrace/dynamic-ftrace-events.
I've checked it.  And it seems to have another problem for indirect
(but not redirect) arrays and strings.  Like 'x32[1] foo[2]'?

Thanks,
Namhyung
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