[PATCH 0/2] arm64: gcs: Return -EPERM when changes are prevented by locking

From: Mark Brown

Date: Thu Sep 10 2026 - 15:05:15 EST


When we refuse to change the GCS configuraiton due to locking we
currently return -EBUSY which is an odd choice. The only userspace I
found that relies on this value at present is the kselftest and other
architectures are using the more obvious -EPERM here let's switch.

Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
---
Mark Brown (2):
arm64: gcs: Return -EPERM not -EBUSY for prctl() locking failures
kselftest/arm64: Check for -EPERM not -EBUSY in the locking test

arch/arm64/include/asm/gcs.h | 2 +-
tools/testing/selftests/arm64/gcs/gcs-locking.c | 4 ++--
2 files changed, 3 insertions(+), 3 deletions(-)
---
base-commit: df2908090cda368b01ff43709f51890076c56157
change-id: 20260910-arm64-gcs-lock-eperm-06ce8f8e5250

Best regards,
--
Mark Brown <broonie@xxxxxxxxxx>