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SubjectRe: [PATCH v1 1/1] f2fs: Use return value of strreplace()
On Wed, 28 Jun 2023 18:02:43 +0300
Andy Shevchenko <andriy.shevchenko@linux.intel.com> wrote:

> Since strreplace() returns the pointer to the string itself,
> we may use it directly in the code.
>
> Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
> ---
> include/trace/events/f2fs.h | 6 ++----
> 1 file changed, 2 insertions(+), 4 deletions(-)
>
> diff --git a/include/trace/events/f2fs.h b/include/trace/events/f2fs.h
> index 793f82cc1515..f5994515290c 100644
> --- a/include/trace/events/f2fs.h
> +++ b/include/trace/events/f2fs.h
> @@ -2234,13 +2234,11 @@ DECLARE_EVENT_CLASS(f2fs__rw_start,
> * because this screws up the tooling that parses
> * the traces.
> */
> - __assign_str(pathbuf, pathname);
> - (void)strreplace(__get_str(pathbuf), ' ', '_');
> + __assign_str(pathbuf, strreplace(pathname, ' ', '_'));

But this modifies the pathname that is passed into the trace event, which
is something that a trace point should never do! In fact, the char
*pathname, really should be a const char * (for which this would fail to
build).

Note, I went to look for these events and I can not find where they are
used. Should these events just be deleted?

-- Steve


> __entry->offset = offset;
> __entry->bytes = bytes;
> __entry->i_size = i_size_read(inode);
> - __assign_str(cmdline, command);
> - (void)strreplace(__get_str(cmdline), ' ', '_');
> + __assign_str(cmdline, strreplace(command, ' ', '_'));
> __entry->pid = pid;
> __entry->ino = inode->i_ino;
> ),

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