From 94de486e4215b83de8a5e908b4b8f7d3979c3b0e Mon Sep 17 00:00:00 2001 From: Mark Brown Date: Thu, 7 Nov 2024 01:39:20 +0000 Subject: [PATCH] kselftest/arm64: Correct misleading comments on fp-stress irritators The comments in the handlers for the irritator signal in the test threads for fp-stress suggest that the irritator will corrupt the register state observed by the main thread but this is not the case, instead the FPSIMD and SVE irritators (which are the only ones that are implemented) modify the current register state which is expected to be overwritten on return from the handler by the saved register state. Update the comment to reflect what the handler is actually doing. Acked-by: Mark Rutland Signed-off-by: Mark Brown Link: https://lore.kernel.org/r/20241107-arm64-fp-stress-irritator-v2-1-c4b9622e36ee@kernel.org Signed-off-by: Catalin Marinas --- tools/testing/selftests/arm64/fp/fpsimd-test.S | 3 +-- tools/testing/selftests/arm64/fp/sve-test.S | 3 +-- 2 files changed, 2 insertions(+), 4 deletions(-) diff --git a/tools/testing/selftests/arm64/fp/fpsimd-test.S b/tools/testing/selftests/arm64/fp/fpsimd-test.S index 8b960d01ed2e..bdfb7cf2e4ec 100644 --- a/tools/testing/selftests/arm64/fp/fpsimd-test.S +++ b/tools/testing/selftests/arm64/fp/fpsimd-test.S @@ -134,8 +134,7 @@ function check_vreg b memcmp endfunction -// Any SVE register modified here can cause corruption in the main -// thread -- but *only* the registers modified here. +// Modify live register state, the signal return will undo our changes function irritator_handler // Increment the irritation signal count (x23): ldr x0, [x2, #ucontext_regs + 8 * 23] diff --git a/tools/testing/selftests/arm64/fp/sve-test.S b/tools/testing/selftests/arm64/fp/sve-test.S index fff60e2a25ad..e3c0d585684d 100644 --- a/tools/testing/selftests/arm64/fp/sve-test.S +++ b/tools/testing/selftests/arm64/fp/sve-test.S @@ -291,8 +291,7 @@ function check_ffr #endif endfunction -// Any SVE register modified here can cause corruption in the main -// thread -- but *only* the registers modified here. +// Modify live register state, the signal return will undo our changes function irritator_handler // Increment the irritation signal count (x23): ldr x0, [x2, #ucontext_regs + 8 * 23] -- 2.49.0