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Date: Sun, 23 Dec 2018 12:32:17 +0900 From: Namhyung Kim <namhyung@...nel.org> To: Steven Rostedt <rostedt@...dmis.org> Cc: linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...nel.org>, Andrew Morton <akpm@...ux-foundation.org>, Joe Perches <joe@...ches.com>, Linus Torvalds <torvalds@...ux-foundation.org>, Yoshinori Sato <ysato@...rs.sourceforge.jp>, Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org, Tom Zanussi <zanussi@...ux.intel.com>, kernel-team@....com Subject: Re: [for-next][PATCH 2/5] tracing: Use str_has_prefix() helper for histogram code On Sat, Dec 22, 2018 at 11:20:09AM -0500, Steven Rostedt wrote: > From: "Steven Rostedt (VMware)" <rostedt@...dmis.org> > > The tracing histogram code contains a lot of instances of the construct: > > strncmp(str, "const", sizeof("const") - 1) > > This can be prone to bugs due to typos or bad cut and paste. Use the > str_has_prefix() helper macro instead that removes the need for having two > copies of the constant string. > > Cc: Tom Zanussi <zanussi@...ux.intel.com> > Signed-off-by: Steven Rostedt (VMware) <rostedt@...dmis.org> > --- > kernel/trace/trace_events_hist.c | 28 ++++++++++++++-------------- > 1 file changed, 14 insertions(+), 14 deletions(-) > > diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c > index c5448c103770..9d590138f870 100644 > --- a/kernel/trace/trace_events_hist.c > +++ b/kernel/trace/trace_events_hist.c > @@ -1881,8 +1881,8 @@ static int parse_action(char *str, struct hist_trigger_attrs *attrs) > if (attrs->n_actions >= HIST_ACTIONS_MAX) > return ret; > > - if ((strncmp(str, "onmatch(", sizeof("onmatch(") - 1) == 0) || > - (strncmp(str, "onmax(", sizeof("onmax(") - 1) == 0)) { > + if ((str_has_prefix(str, "onmatch(")) || > + (str_has_prefix(str, "onmax("))) { > attrs->action_str[attrs->n_actions] = kstrdup(str, GFP_KERNEL); > if (!attrs->action_str[attrs->n_actions]) { > ret = -ENOMEM; > @@ -1899,34 +1899,34 @@ static int parse_assignment(char *str, struct hist_trigger_attrs *attrs) > { > int ret = 0; > > - if ((strncmp(str, "key=", sizeof("key=") - 1) == 0) || > - (strncmp(str, "keys=", sizeof("keys=") - 1) == 0)) { > + if ((str_has_prefix(str, "key=")) || > + (str_has_prefix(str, "keys="))) { > attrs->keys_str = kstrdup(str, GFP_KERNEL); > if (!attrs->keys_str) { > ret = -ENOMEM; > goto out; > } > - } else if ((strncmp(str, "val=", sizeof("val=") - 1) == 0) || > - (strncmp(str, "vals=", sizeof("vals=") - 1) == 0) || > - (strncmp(str, "values=", sizeof("values=") - 1) == 0)) { > + } else if ((str_has_prefix(str, "val=")) || > + (str_has_prefix(str, "vals=")) || > + (str_has_prefix(str, "values="))) { > attrs->vals_str = kstrdup(str, GFP_KERNEL); > if (!attrs->vals_str) { > ret = -ENOMEM; > goto out; > } > - } else if (strncmp(str, "sort=", sizeof("sort=") - 1) == 0) { > + } else if (str_has_prefix(str, "sort=")) { > attrs->sort_key_str = kstrdup(str, GFP_KERNEL); > if (!attrs->sort_key_str) { > ret = -ENOMEM; > goto out; > } > - } else if (strncmp(str, "name=", sizeof("name=") - 1) == 0) { > + } else if (str_has_prefix(str, "name=")) { > attrs->name = kstrdup(str, GFP_KERNEL); > if (!attrs->name) { > ret = -ENOMEM; > goto out; > } > - } else if (strncmp(str, "clock=", sizeof("clock=") - 1) == 0) { > + } else if (str_has_prefix(str, "clock=")) { > strsep(&str, "="); > if (!str) { > ret = -EINVAL; > @@ -1939,7 +1939,7 @@ static int parse_assignment(char *str, struct hist_trigger_attrs *attrs) > ret = -ENOMEM; > goto out; > } > - } else if (strncmp(str, "size=", sizeof("size=") - 1) == 0) { > + } else if (str_has_prefix(str, "size=")) { > int map_bits = parse_map_size(str); > > if (map_bits < 0) { > @@ -3558,7 +3558,7 @@ static struct action_data *onmax_parse(char *str) > if (!onmax_fn_name || !str) > goto free; > > - if (strncmp(onmax_fn_name, "save", sizeof("save") - 1) == 0) { > + if (str_has_prefix(onmax_fn_name, "save")) { > char *params = strsep(&str, ")"); > > if (!params) { > @@ -4346,7 +4346,7 @@ static int parse_actions(struct hist_trigger_data *hist_data) > for (i = 0; i < hist_data->attrs->n_actions; i++) { > str = hist_data->attrs->action_str[i]; > > - if (strncmp(str, "onmatch(", sizeof("onmatch(") - 1) == 0) { > + if (str_has_prefix(str, "onmatch(")) { > char *action_str = str + sizeof("onmatch(") - 1; You'd better using the return value of str_has_prefix(). > > data = onmatch_parse(tr, action_str); > @@ -4355,7 +4355,7 @@ static int parse_actions(struct hist_trigger_data *hist_data) > break; > } > data->fn = action_trace; > - } else if (strncmp(str, "onmax(", sizeof("onmax(") - 1) == 0) { > + } else if (str_has_prefix(str, "onmax(")) { > char *action_str = str + sizeof("onmax(") - 1; Ditto. Thanks, Namhyung > > data = onmax_parse(action_str); > -- > 2.19.2 > >
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