[PATCH 5.10 024/103] erofs: fix up erofs_lookup tracepoint
From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: 2021-09-27 17:13:39
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lkml
From: Gao Xiang <redacted> commit 93368aab0efc87288cac65e99c9ed2e0ffc9e7d0 upstream. Fix up a misuse that the filename pointer isn't always valid in the ring buffer, and we should copy the content instead. Link: https://lore.kernel.org/r/20210921143531.81356-1-hsiangkao@linux.alibaba.com (local) Fixes: 13f06f48f7bf ("staging: erofs: support tracepoint") Cc: stable@vger.kernel.org # 4.19+ Reviewed-by: Chao Yu <chao@kernel.org> Signed-off-by: Gao Xiang <redacted> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- include/trace/events/erofs.h | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-)
--- a/include/trace/events/erofs.h
+++ b/include/trace/events/erofs.h@@ -35,20 +35,20 @@ TRACE_EVENT(erofs_lookup, TP_STRUCT__entry( __field(dev_t, dev ) __field(erofs_nid_t, nid ) - __field(const char *, name ) + __string(name, dentry->d_name.name ) __field(unsigned int, flags ) ), TP_fast_assign( __entry->dev = dir->i_sb->s_dev; __entry->nid = EROFS_I(dir)->nid; - __entry->name = dentry->d_name.name; + __assign_str(name, dentry->d_name.name); __entry->flags = flags; ), TP_printk("dev = (%d,%d), pnid = %llu, name:%s, flags:%x", show_dev_nid(__entry), - __entry->name, + __get_str(name), __entry->flags) );