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authorKonstantin Khlebnikov <khlebnikov@yandex-team.ru>2017-02-08 14:28:55 +0300
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-02-10 16:02:26 +0100
commit17627157cda13089d8a6c1c2d35acb07334b899c (patch)
tree9a717bcda9657c2e46943d852631e0a53fe3e45a /include
parent64e90a8acb8590c2468c919f803652f081e3a4bf (diff)
kernfs: handle null pointers while printing node name and path
Null kernfs nodes could be found at cgroups during construction. It seems safer to handle these null pointers right in kernfs in the same way as printf prints "(null)" for null pointer string. Signed-off-by: Konstantin Khlebnikov <khlebnikov@yandex-team.ru> Acked-by: Tejun Heo <tj@kernel.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include')
-rw-r--r--include/trace/events/cgroup.h20
1 files changed, 6 insertions, 14 deletions
diff --git a/include/trace/events/cgroup.h b/include/trace/events/cgroup.h
index ab68640a18d0..c226f50e88fa 100644
--- a/include/trace/events/cgroup.h
+++ b/include/trace/events/cgroup.h
@@ -61,19 +61,15 @@ DECLARE_EVENT_CLASS(cgroup,
__field( int, id )
__field( int, level )
__dynamic_array(char, path,
- cgrp->kn ? cgroup_path(cgrp, NULL, 0) + 1
- : strlen("(null)"))
+ cgroup_path(cgrp, NULL, 0) + 1)
),
TP_fast_assign(
__entry->root = cgrp->root->hierarchy_id;
__entry->id = cgrp->id;
__entry->level = cgrp->level;
- if (cgrp->kn)
- cgroup_path(cgrp, __get_dynamic_array(path),
- __get_dynamic_array_len(path));
- else
- __assign_str(path, "(null)");
+ cgroup_path(cgrp, __get_dynamic_array(path),
+ __get_dynamic_array_len(path));
),
TP_printk("root=%d id=%d level=%d path=%s",
@@ -119,8 +115,7 @@ DECLARE_EVENT_CLASS(cgroup_migrate,
__field( int, dst_id )
__field( int, dst_level )
__dynamic_array(char, dst_path,
- dst_cgrp->kn ? cgroup_path(dst_cgrp, NULL, 0) + 1
- : strlen("(null)"))
+ cgroup_path(dst_cgrp, NULL, 0) + 1)
__field( int, pid )
__string( comm, task->comm )
),
@@ -129,11 +124,8 @@ DECLARE_EVENT_CLASS(cgroup_migrate,
__entry->dst_root = dst_cgrp->root->hierarchy_id;
__entry->dst_id = dst_cgrp->id;
__entry->dst_level = dst_cgrp->level;
- if (dst_cgrp->kn)
- cgroup_path(dst_cgrp, __get_dynamic_array(dst_path),
- __get_dynamic_array_len(dst_path));
- else
- __assign_str(dst_path, "(null)");
+ cgroup_path(dst_cgrp, __get_dynamic_array(dst_path),
+ __get_dynamic_array_len(dst_path));
__entry->pid = task->pid;
__assign_str(comm, task->comm);
),

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