[LTP] [PATCH v1] semctl: use IPC_PRIVATE to minimize interference.

[LTP] [PATCH v1] semctl: use IPC_PRIVATE to minimize interference.

[Stephen Bertram via ltp]

This update solves previous issues when tests were
run in parallel with multiple workers in tmt.

Signed-off-by: Stephen Bertram <sbertram@redhat.com>
---
 testcases/kernel/syscalls/ipc/semctl/semctl03.c | 5 +----
 testcases/kernel/syscalls/ipc/semctl/semctl05.c | 6 +-----
 testcases/kernel/syscalls/ipc/semctl/semctl07.c | 3 +--
 3 files changed, 3 insertions(+), 11 deletions(-)

diff --git a/testcases/kernel/syscalls/ipc/semctl/semctl03.c b/testcases/kernel/syscalls/ipc/semctl/semctl03.c
index 5a11b95ef..dc11d0823 100644
--- a/testcases/kernel/syscalls/ipc/semctl/semctl03.c
+++ b/testcases/kernel/syscalls/ipc/semctl/semctl03.c
@@ -84,14 +84,11 @@ static void verify_semctl(unsigned int n)
 
 static void setup(void)
 {
-	static key_t semkey;
 	struct test_variants *tv = &variants[tst_variant];
 
 	tst_res(TINFO, "Testing variant: %s", tv->desc);
 
-	semkey = GETIPCKEY();
-
-	sem_id = SAFE_SEMGET(semkey, PSEMS, IPC_CREAT | IPC_EXCL | SEM_RA);
+	sem_id = SAFE_SEMGET(IPC_PRIVATE, PSEMS, IPC_CREAT | IPC_EXCL | SEM_RA);
 
 	bad_ptr = tst_get_bad_addr(NULL);
 }
diff --git a/testcases/kernel/syscalls/ipc/semctl/semctl05.c b/testcases/kernel/syscalls/ipc/semctl/semctl05.c
index 985c1f039..f1ab69f59 100644
--- a/testcases/kernel/syscalls/ipc/semctl/semctl05.c
+++ b/testcases/kernel/syscalls/ipc/semctl/semctl05.c
@@ -45,11 +45,7 @@ static void verify_semctl(unsigned int n)
 
 static void setup(void)
 {
-	static key_t semkey;
-
-	semkey = GETIPCKEY();
-
-	sem_id = SAFE_SEMGET(semkey, PSEMS, IPC_CREAT | IPC_EXCL | SEM_RA);
+	sem_id = SAFE_SEMGET(IPC_PRIVATE, PSEMS, IPC_CREAT | IPC_EXCL | SEM_RA);
 }
 
 static void cleanup(void)
diff --git a/testcases/kernel/syscalls/ipc/semctl/semctl07.c b/testcases/kernel/syscalls/ipc/semctl/semctl07.c
index 1b03f0ab2..a0b5f4928 100644
--- a/testcases/kernel/syscalls/ipc/semctl/semctl07.c
+++ b/testcases/kernel/syscalls/ipc/semctl/semctl07.c
@@ -130,10 +130,9 @@ static void verify_semctl(void)
 
 static void setup(void)
 {
-	key_t key = GETIPCKEY();
 	nsems = 1;
 
-	semid = SAFE_SEMGET(key, nsems, SEM_RA | IPC_CREAT);
+	semid = SAFE_SEMGET(IPC_PRIVATE, nsems, SEM_RA | IPC_CREAT);
 }
 
 static void cleanup(void)
-- 
2.53.0


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Re: [LTP] semctl: use IPC_PRIVATE to minimize interference.

[linuxtestproject.agent]

Hi Stephen,

On Tue, 14 Apr 2026 12:51:14 -0400, Stephen Bertram wrote:
> semctl: use IPC_PRIVATE to minimize interference.

> This update solves previous issues when tests were
> run in parallel with multiple workers in tmt.

Since you describe this as fixing a bug, a Fixes: tag is expected. Please
add one pointing to the commit that introduced the named-key usage. If
that commit predates LTP's git history, mention it in the cover letter.

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Note:

Our agent completed the review of the patch. The agent can sometimes
produce false positives although often its findings are genuine. If you
find issues with the review, please comment this email or ignore the
suggestions.

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Re: [LTP] [PATCH v1] semctl: use IPC_PRIVATE to minimize interference.

[Cyril Hrubis]

Hi!
Pushed, thanks.

-- 
Cyril Hrubis
chrubis@suse.cz

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