6.6-stable review patch. If anyone has any objections, please let me know.
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From: Veronika Molnarova vmolnaro@redhat.com
[ Upstream commit 28b01743ca752cea5ab182297d8b912b22f2a2d1 ]
The 'vg' register for arm64 shows up in --user_regs as available when masking the variable AT_HWCAP with 1 << 22 returns '1' as done in perf_regs.c.
However, in subtests for support of SVE, the check for the 'vg' register is done by masking the variable AT_HWCAP with the value 0x200000 which is equals to 1 << 21 instead of 1 << 22.
This results in inconsistencies on certain systems where the test expects that the 'vg' register is not operational when it is, and vice-versa.
During the testing on a machine that the test expected not to have the 'vg' register available, 'perf record' with the option --user-regs showed records for the 'vg' register together with all of the others, which means that the mask for the subtest of perf_event_attr is off by one.
Change the value of the mask from 0x200000 to 0x400000 to correct it.
Fixes: 9440ebdc333dd12e ("perf test arm64: Add attr tests for new VG register") Reviewed-by: Leo Yan leo.yan@linaro.org Signed-off-by: Veronika Molnarova vmolnaro@redhat.com Cc: James Clark james.clark@arm.com Cc: Michael Petlan mpetlan@redhat.com Link: https://lore.kernel.org/r/20231201194617.13012-1-vmolnaro@redhat.com Signed-off-by: Arnaldo Carvalho de Melo acme@redhat.com Signed-off-by: Sasha Levin sashal@kernel.org --- tools/perf/tests/attr/test-record-user-regs-no-sve-aarch64 | 2 +- tools/perf/tests/attr/test-record-user-regs-sve-aarch64 | 2 +- 2 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/tools/perf/tests/attr/test-record-user-regs-no-sve-aarch64 b/tools/perf/tests/attr/test-record-user-regs-no-sve-aarch64 index fbb065842880..bed765450ca9 100644 --- a/tools/perf/tests/attr/test-record-user-regs-no-sve-aarch64 +++ b/tools/perf/tests/attr/test-record-user-regs-no-sve-aarch64 @@ -6,4 +6,4 @@ args = --no-bpf-event --user-regs=vg kill >/dev/null 2>&1 ret = 129 test_ret = true arch = aarch64 -auxv = auxv["AT_HWCAP"] & 0x200000 == 0 +auxv = auxv["AT_HWCAP"] & 0x400000 == 0 diff --git a/tools/perf/tests/attr/test-record-user-regs-sve-aarch64 b/tools/perf/tests/attr/test-record-user-regs-sve-aarch64 index c598c803221d..a65113cd7311 100644 --- a/tools/perf/tests/attr/test-record-user-regs-sve-aarch64 +++ b/tools/perf/tests/attr/test-record-user-regs-sve-aarch64 @@ -6,7 +6,7 @@ args = --no-bpf-event --user-regs=vg kill >/dev/null 2>&1 ret = 1 test_ret = true arch = aarch64 -auxv = auxv["AT_HWCAP"] & 0x200000 == 0x200000 +auxv = auxv["AT_HWCAP"] & 0x400000 == 0x400000 kernel_since = 6.1
[event:base-record]