diff mbox series

[4/6] bpf: task_group_seq_get_next: kill next_task

Message ID 20230825161951.GA16878@redhat.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series bpf: task_group_seq_get_next: use __next_thread() | expand

Checks

Context Check Description
netdev/series_format warning Target tree name not specified in the subject
netdev/tree_selection success Guessed tree name to be net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 1332 this patch: 1332
netdev/cc_maintainers warning 9 maintainers not CCed: kpsingh@kernel.org martin.lau@linux.dev john.fastabend@gmail.com sdf@google.com song@kernel.org yonghong.song@linux.dev jolsa@kernel.org haoluo@google.com ast@kernel.org
netdev/build_clang success Errors and warnings before: 1353 this patch: 1353
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 1355 this patch: 1355
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 36 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-next-PR fail PR summary
bpf/vmtest-bpf-next-VM_Test-0 success Logs for ${{ matrix.test }} on ${{ matrix.arch }} with ${{ matrix.toolchain_full }}
bpf/vmtest-bpf-next-VM_Test-1 success Logs for ShellCheck
bpf/vmtest-bpf-next-VM_Test-2 fail Logs for build for aarch64 with gcc
bpf/vmtest-bpf-next-VM_Test-3 fail Logs for build for s390x with gcc
bpf/vmtest-bpf-next-VM_Test-6 success Logs for set-matrix
bpf/vmtest-bpf-next-VM_Test-5 fail Logs for build for x86_64 with llvm-16
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bpf/vmtest-bpf-next-VM_Test-4 fail Logs for build for x86_64 with gcc

Commit Message

Oleg Nesterov Aug. 25, 2023, 4:19 p.m. UTC 
It only adds the unnecessary confusion and compicates the "retry" code.

Signed-off-by: Oleg Nesterov <oleg@redhat.com>
---
 kernel/bpf/task_iter.c | 14 ++++++--------
 1 file changed, 6 insertions(+), 8 deletions(-)

Comments

Yonghong Song Aug. 25, 2023, 10:55 p.m. UTC | #1 
On 8/25/23 9:19 AM, Oleg Nesterov wrote:
> It only adds the unnecessary confusion and compicates the "retry" code.
> 
> Signed-off-by: Oleg Nesterov <oleg@redhat.com>

Acked-by: Yonghong Song <yonghong.song@linux.dev>
diff mbox series

Patch

diff --git a/kernel/bpf/task_iter.c b/kernel/bpf/task_iter.c
index 2264870ae3fc..f51f476ec679 100644
--- a/kernel/bpf/task_iter.c
+++ b/kernel/bpf/task_iter.c
@@ -35,7 +35,7 @@  static struct task_struct *task_group_seq_get_next(struct bpf_iter_seq_task_comm
 						   u32 *tid,
 						   bool skip_if_dup_files)
 {
-	struct task_struct *task, *next_task;
+	struct task_struct *task;
 	struct pid *pid;
 	u32 saved_tid;
 
@@ -68,10 +68,10 @@  static struct task_struct *task_group_seq_get_next(struct bpf_iter_seq_task_comm
 		return NULL;
 
 retry:
-	next_task = next_thread(task);
+	task = next_thread(task);
 
 	saved_tid = *tid;
-	*tid = __task_pid_nr_ns(next_task, PIDTYPE_PID, common->ns);
+	*tid = __task_pid_nr_ns(task, PIDTYPE_PID, common->ns);
 	if (!*tid || *tid == common->pid) {
 		/* Run out of tasks of a process.  The tasks of a
 		 * thread_group are linked as circular linked list.
@@ -82,13 +82,11 @@  static struct task_struct *task_group_seq_get_next(struct bpf_iter_seq_task_comm
 
 	common->pid_visiting = *tid;
 
-	if (skip_if_dup_files && next_task->files == next_task->group_leader->files) {
-		task = next_task;
+	if (skip_if_dup_files && task->files == task->group_leader->files)
 		goto retry;
-	}
 
-	get_task_struct(next_task);
-	return next_task;
+	get_task_struct(task);
+	return task;
 }
 
 static struct task_struct *task_seq_get_next(struct bpf_iter_seq_task_common *common,