Re: [cocci] [PATCH 15/61] trace: Prefer IS_ERR_OR_NULL over manual NULL check
Steven Rostedt <[email protected]> Tue, 10 Mar 2026 10:07:50 -0400
| Newsgroups | fr.inria.cocci,dev.linux.lists.dm-devel,dev.linux.lists.gfs2,dev.linux.lists.iommu,dev.linux.lists.ntfs3,dev.linux.lists.sched-ext,dev.linux.lists.v9fs,org.freedesktop.lists.amd-gfx,org.freedesktop.lists.dri-devel,org.freedesktop.lists.intel-gfx,org.infradead.lists.linux-mtd,org.infradead.lists.linux-phy,org.infradead.lists.linux-rockchip,org.kernel.vger.bpf,org.kernel.vger.ceph-devel,org.kernel.vger.kvm,org.kernel.vger.linux-block,org.kernel.vger.linux-bluetooth,org.kernel.vger.linux-btrfs,org.kernel.vger.linux-cifs,org.kernel.vger.linux-clk,org.kernel.vger.linux-ext4,org.kernel.vger.linux-fsdevel,org.kernel.vger.linux-gpio,org.kernel.vger.linux-hyperv,org.kernel.vger.linux-input,org.kernel.vger.linux-kernel,org.kernel.vger.linux-leds,org.kernel.vger.linux-media,org.kernel.vger.linux-mips,org.kernel.vger.linux-modules,org.kernel.vger.linux-nfs,org.kernel.vger.linux-omap,org.kernel.vger.linux-pm,org.kernel.vger.linux-s390,org.kernel.vger.linux-scsi,org.kernel.vger.linux-sctp,org.kernel.vger.linux-security-module,org.kernel.vger.linux-sh,org.kernel.vger.linux-sound,org.kernel.vger.linux-trace-kernel,org.kernel.vger.linux-usb,org.kernel.vger.linux-wireless,org.kernel.vger.netdev,org.kernel.vger.target-devel,org.kvack.linux-mm,org.osuosl.intel-wired-lan,org.ozlabs.lists.linux-erofs |
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| Message-ID | <[email protected]> |
On Tue, 10 Mar 2026 12:48:41 +0100 Philipp Hahn <[email protected]> wrote: > Prefer using IS_ERR_OR_NULL() over using IS_ERR() and a manual NULL > check. Why? > > Change generated with coccinelle. > > To: Steven Rostedt <[email protected]> > To: Masami Hiramatsu <[email protected]> > To: Mathieu Desnoyers <[email protected]> > Cc: [email protected] > Cc: [email protected] > Signed-off-by: Philipp Hahn <[email protected]> > --- > kernel/trace/fprobe.c | 2 +- > kernel/trace/kprobe_event_gen_test.c | 2 +- > kernel/trace/trace_events_hist.c | 2 +- > 3 files changed, 3 insertions(+), 3 deletions(-) > > diff --git a/kernel/trace/fprobe.c b/kernel/trace/fprobe.c > index dcadf1d23b8a31f571392d0c49cbd22df1716b4f..a94ce810d83b90f55d1178a9bd29c78fd068df4c 100644 > --- a/kernel/trace/fprobe.c > +++ b/kernel/trace/fprobe.c > @@ -607,7 +607,7 @@ static int fprobe_module_callback(struct notifier_block *nb, > do { > rhashtable_walk_start(&iter); > > - while ((node = rhashtable_walk_next(&iter)) && !IS_ERR(node)) > + while (!IS_ERR_OR_NULL((node = rhashtable_walk_next(&iter)))) Ug, No! That looks so much worse than the original. -- Steve > fprobe_remove_node_in_module(mod, node, &alist); > > rhashtable_walk_stop(&iter); > diff --git a/kernel/trace/kprobe_event_gen_test.c b/kernel/trace/kprobe_event_gen_test.c > index 5a4b722b50451bfdee42769a6d3be39c055690d1..a1735ca273f0b756aa1fcfcdab30ddad9bc51c5f 100644 > --- a/kernel/trace/kprobe_event_gen_test.c > +++ b/kernel/trace/kprobe_event_gen_test.c > @@ -75,7 +75,7 @@ static struct trace_event_file *gen_kretprobe_test; > > static bool trace_event_file_is_valid(struct trace_event_file *input) > { > - return input && !IS_ERR(input); > + return !IS_ERR_OR_NULL(input); > } > > /* > diff --git a/kernel/trace/trace_events_hist.c b/kernel/trace/trace_events_hist.c > index 73ea180cad555898693e92ee397a1c9493c7c167..59df215e1dfd9349eca1c0823ed709ec7285f766 100644 > --- a/kernel/trace/trace_events_hist.c > +++ b/kernel/trace/trace_events_hist.c > @@ -3973,7 +3973,7 @@ trace_action_create_field_var(struct hist_trigger_data *hist_data, > */ > field_var = create_target_field_var(hist_data, system, event, var); > > - if (field_var && !IS_ERR(field_var)) { > + if (!IS_ERR_OR_NULL(field_var)) { > save_field_var(hist_data, field_var); > hist_field = field_var->var; > } else { >