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Groups > linux.kernel > #1523736
| From | Andy Lutomirski <luto@kernel.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | [PATCH 0/2] x86/vdso: RDPID support and a test |
| Date | 2016-11-16 19:30 +0100 |
| Message-ID | <sEd85-6vq-7@gated-at.bofh.it> (permalink) |
| Organization | linux.* mail to news gateway |
RDPID is a new instruction in unspecified future Intel processors (sigh) that returns MSR_TSC_AUX. This will finally let the vDSO stop using LSL. Patch 1 is the meat and patch 2 is the test. Megha has kindly tested them for me, since I don't own an unspecified Intel processor :) Andy Lutomirski (2): x86/vdso: Use RDPID in preference to LSL when available selftests/x86: Add test_vdso to test getcpu arch/x86/include/asm/cpufeatures.h | 1 + arch/x86/include/asm/vgtod.h | 7 +- tools/testing/selftests/x86/Makefile | 2 +- tools/testing/selftests/x86/test_vdso.c | 123 ++++++++++++++++++++++++++++++++ 4 files changed, 131 insertions(+), 2 deletions(-) create mode 100644 tools/testing/selftests/x86/test_vdso.c -- 2.7.4
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[PATCH 0/2] x86/vdso: RDPID support and a test Andy Lutomirski <luto@kernel.org> - 2016-11-16 19:30 +0100
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