* [PATCH -next] sched/fair: Use struct_size()
@ 2023-07-25 19:50 Ruan Jinjie
2023-07-25 13:25 ` Peter Zijlstra
0 siblings, 1 reply; 2+ messages in thread
From: Ruan Jinjie @ 2023-07-25 19:50 UTC (permalink / raw)
To: mingo, peterz, juri.lelli, vincent.guittot, dietmar.eggemann,
rostedt, bsegall, mgorman, bristot, vschneid, linux-kernel
Cc: ruanjinjie
Use struct_size() instead of hand-writing it, when allocating a structure
with a flex array.
This is less verbose.
Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
---
kernel/sched/fair.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
index f8b71ea5948b..cc041a48100f 100644
--- a/kernel/sched/fair.c
+++ b/kernel/sched/fair.c
@@ -2889,9 +2889,8 @@ static void task_numa_group(struct task_struct *p, int cpupid, int flags,
int i;
if (unlikely(!deref_curr_numa_group(p))) {
- unsigned int size = sizeof(struct numa_group) +
- NR_NUMA_HINT_FAULT_STATS *
- nr_node_ids * sizeof(unsigned long);
+ unsigned int size = struct_size(grp, faults,
+ NR_NUMA_HINT_FAULT_STATS * nr_node_ids);
grp = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
if (!grp)
--
2.34.1
^ permalink raw reply [flat|nested] 2+ messages in thread* Re: [PATCH -next] sched/fair: Use struct_size()
2023-07-25 19:50 [PATCH -next] sched/fair: Use struct_size() Ruan Jinjie
@ 2023-07-25 13:25 ` Peter Zijlstra
0 siblings, 0 replies; 2+ messages in thread
From: Peter Zijlstra @ 2023-07-25 13:25 UTC (permalink / raw)
To: Ruan Jinjie
Cc: mingo, juri.lelli, vincent.guittot, dietmar.eggemann, rostedt,
bsegall, mgorman, bristot, vschneid, linux-kernel
On Tue, Jul 25, 2023 at 07:50:20PM +0000, Ruan Jinjie wrote:
> Use struct_size() instead of hand-writing it, when allocating a structure
> with a flex array.
>
> This is less verbose.
As per all the other times, no. It is also less clear. I never can
remember what that thing does and the code it replaces is utterly
trivial.
> Signed-off-by: Ruan Jinjie <ruanjinjie@huawei.com>
> ---
> kernel/sched/fair.c | 5 ++---
> 1 file changed, 2 insertions(+), 3 deletions(-)
>
> diff --git a/kernel/sched/fair.c b/kernel/sched/fair.c
> index f8b71ea5948b..cc041a48100f 100644
> --- a/kernel/sched/fair.c
> +++ b/kernel/sched/fair.c
> @@ -2889,9 +2889,8 @@ static void task_numa_group(struct task_struct *p, int cpupid, int flags,
> int i;
>
> if (unlikely(!deref_curr_numa_group(p))) {
> - unsigned int size = sizeof(struct numa_group) +
> - NR_NUMA_HINT_FAULT_STATS *
> - nr_node_ids * sizeof(unsigned long);
> + unsigned int size = struct_size(grp, faults,
> + NR_NUMA_HINT_FAULT_STATS * nr_node_ids);
>
> grp = kzalloc(size, GFP_KERNEL | __GFP_NOWARN);
> if (!grp)
> --
> 2.34.1
>
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2023-07-25 13:26 UTC | newest]
Thread overview: 2+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2023-07-25 19:50 [PATCH -next] sched/fair: Use struct_size() Ruan Jinjie
2023-07-25 13:25 ` Peter Zijlstra
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox
all inboxes | Powered by JetHome®