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lttng-modules: fix build against 5.18-rc7+

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lttng-modules fails to build against 5.18-rc7, the details of the fix
are as follows:

   The commit [fix: sched/tracing: Don't re-read p->state when emitting
   sched_switch event (v5.18)] was correct, but the kernel changed their
   mind with the following commit:

      commit 9c2136be0878c88c53dea26943ce40bb03ad8d8d
      Author: Delyan Kratunov <delyank@fb.com>
      Date:   Wed May 11 18:28:36 2022 +0000

          sched/tracing: Append prev_state to tp args instead

          Commit fa2c3254d7cf (sched/tracing: Don't re-read p->state when emitting
          sched_switch event, 2022-01-20) added a new prev_state argument to the
          sched_switch tracepoint, before the prev task_struct pointer.

          This reordering of arguments broke BPF programs that use the raw
          tracepoint (e.g. tp_btf programs). The type of the second argument has
          changed and existing programs that assume a task_struct* argument
          (e.g. for bpf_task_storage access) will now fail to verify.

          If we instead append the new argument to the end, all existing programs
          would continue to work and can conditionally extract the prev_state
          argument on supported kernel versions.

          Fixes: fa2c3254d7cf (sched/tracing: Don't re-read p->state when emitting sched_switch event, 2022-01-20)
          Signed-off-by: Delyan Kratunov <delyank@fb.com>
          Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
          Acked-by: Steven Rostedt (Google) <rostedt@goodmis.org>
          Link: https://lkml.kernel.org/r/c8a6930dfdd58a4a5755fc01732675472979732b.camel@fb.com

   By reordering the parameters (again) we can get back up and building.

Upstream-Status: Backport

(From OE-Core rev: fb69e5cfb043a15354beb2d613772aa0233d12ae)

Signed-off-by: Bruce Ashfield <bruce.ashfield@gmail.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Bruce Ashfield
2022-05-19 20:46:09 -04:00
committed by Richard Purdie
parent b31f6828a4
commit 5eb7f9ca81
2 changed files with 60 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

59
meta/recipes-kernel/lttng/lttng-modules/0001-fix-sched-tracing-Append-prev_state-to-tp-args-inste.patch Normal file
View File

@@ -0,0 +1,59 @@
From 9c5b8de32b5745f3ff31079c02da64595e101bee Mon Sep 17 00:00:00 2001
From: Michael Jeanson <mjeanson@efficios.com>
Date: Tue, 17 May 2022 11:46:29 -0400
Subject: [PATCH] fix: sched/tracing: Append prev_state to tp args instead
(v5.18)
See upstream commit :
commit 9c2136be0878c88c53dea26943ce40bb03ad8d8d
Author: Delyan Kratunov <delyank@fb.com>
Date: Wed May 11 18:28:36 2022 +0000
sched/tracing: Append prev_state to tp args instead
Commit fa2c3254d7cf (sched/tracing: Don't re-read p->state when emitting
sched_switch event, 2022-01-20) added a new prev_state argument to the
sched_switch tracepoint, before the prev task_struct pointer.
This reordering of arguments broke BPF programs that use the raw
tracepoint (e.g. tp_btf programs). The type of the second argument has
changed and existing programs that assume a task_struct* argument
(e.g. for bpf_task_storage access) will now fail to verify.
If we instead append the new argument to the end, all existing programs
would continue to work and can conditionally extract the prev_state
argument on supported kernel versions.
Upstream-Status: Backport
Change-Id: Ife2ec88a8bea2743562590cbd357068d7773863f
Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
---
include/instrumentation/events/sched.h | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/include/instrumentation/events/sched.h b/include/instrumentation/events/sched.h
index 339bec94..c1c3df15 100644
--- a/include/instrumentation/events/sched.h
+++ b/include/instrumentation/events/sched.h
@@ -356,11 +356,11 @@ LTTNG_TRACEPOINT_EVENT_INSTANCE(sched_wakeup_template, sched_wakeup_new,
LTTNG_TRACEPOINT_EVENT(sched_switch,
TP_PROTO(bool preempt,
- unsigned int prev_state,
struct task_struct *prev,
- struct task_struct *next),
+ struct task_struct *next,
+ unsigned int prev_state),
- TP_ARGS(preempt, prev_state, prev, next),
+ TP_ARGS(preempt, prev, next, prev_state),
TP_FIELDS(
ctf_array_text(char, prev_comm, prev->comm, TASK_COMM_LEN)
--
2.19.1

1
meta/recipes-kernel/lttng/lttng-modules_2.13.3.bb
View File

@@ -20,6 +20,7 @@ SRC_URI = "https://lttng.org/files/${BPN}/${BPN}-${PV}.tar.bz2 \
file://0008-fix-scsi-core-Remove-scsi-scsi_request.h-v5.18.patch \
file://0009-Rename-genhd-wrapper-to-blkdev.patch \
file://0010-fix-mm-compaction-cleanup-the-compaction-trace-event.patch \
file://0001-fix-sched-tracing-Append-prev_state-to-tp-args-inste.patch \
"
# Use :append here so that the patch is applied also when using devupstream