This is a note to let you know that I've just added the patch titled
perf test record user-regs: Fix mask for vg register
to the 6.7-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
perf-test-record-user-regs-fix-mask-for-vg-register.patch
and it can be found in the queue-6.7 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
commit 1bbfb8671dbc92b055047037591d443d2e6d9046
Author: Veronika Molnarova <vmolnaro@xxxxxxxxxx>
Date: Fri Dec 1 20:46:17 2023 +0100
perf test record user-regs: Fix mask for vg register
[ 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@xxxxxxxxxx>
Signed-off-by: Veronika Molnarova <vmolnaro@xxxxxxxxxx>
Cc: James Clark <james.clark@xxxxxxx>
Cc: Michael Petlan <mpetlan@xxxxxxxxxx>
Link: https://lore.kernel.org/r/20231201194617.13012-1-vmolnaro@xxxxxxxxxx
Signed-off-by: Arnaldo Carvalho de Melo <acme@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
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]
