[ Adding Masami and Mathieu ]
Oops, I accidentally used the RTLA script to send these.
Sorry Tomas and John ;-)
-- Steve
On Sat, 02 Aug 2025 12:27:34 -0400
Steven Rostedt <rostedt@kernel.org> wrote:
> Last minute changes for v6.17
>
> - Remove unneeded goto out statements
>
> Over time, the logic was restructured but left a "goto out" where the
> out label simply did a "return ret;". Instead of jumping to this out
> label, simply return immediately and remove the out label.
>
> - Clean up the tracing code with guard() and __free() logic
>
> There were several locations that were prime candidates for using guard()
> and __free() helpers. Switch them over to use them.
>
> - Fix output of function argument traces for unsigned int values
>
> The function tracer with "func-args" option set will record up to 6 argument
> registers and then use BTF to format them for human consumption when the
> trace file is read. There's several arguments that are "unsigned long" and
> even "unsigned int" that are either and address or a mask. It is easier to
> understand if they were printed using hexadecimal instead of decimal.
> The old method just printed all non-pointer values as signed integers,
> which made it even worse for unsigned integers.
>
> For instance, instead of:
>
> __local_bh_disable_ip(ip=-2127311112, cnt=256) <-handle_softirqs
>
> Show:
>
> __local_bh_disable_ip(ip=0xffffffff8133cef8, cnt=0x100) <-handle_softirqs
>
> git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace.git
> trace/for-next
>
> Head SHA1: 3ca824369b71d4b441e1fdcdee8e66bcb05510a9
>
>
> Steven Rostedt (6):
> tracing: Remove unneeded goto out logic
> tracing: Add guard(ring_buffer_nest)
> tracing: Add guard() around locks and mutexes in trace.c
> tracing: Use __free(kfree) in trace.c to remove gotos
> ring-buffer: Convert ring_buffer_write() to use guard(preempt_notrace)
> tracing: Have unsigned int function args displayed as hexadecimal
>
> ----
> include/linux/ring_buffer.h | 3 +
> kernel/trace/ring_buffer.c | 16 +--
> kernel/trace/trace.c | 287 ++++++++++++++------------------------
> kernel/trace/trace_events_synth.c | 6 +-
> kernel/trace/trace_output.c | 8 +-
> 5 files changed, 120 insertions(+), 200 deletions(-)