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Groups > linux.kernel > #1448856
| From | Dan Williams <dan.j.williams@intel.com> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH v2 16/17] x86/insn: remove pcommit |
| Date | 2016-07-23 03:00 +0200 |
| Message-ID | <rXTsl-4yh-1@gated-at.bofh.it> (permalink) |
| References | (1 earlier) <rTdBn-3ye-1@gated-at.bofh.it> <rU7ke-6jl-17@gated-at.bofh.it> <rUec2-2Bd-25@gated-at.bofh.it> <rXL1M-7Ib-23@gated-at.bofh.it> <rXLXQ-8gM-9@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Fri, Jul 22, 2016 at 9:52 AM, Ingo Molnar <mingo@kernel.org> wrote: > > * Dan Williams <dan.j.williams@intel.com> wrote: > >> On Tue, Jul 12, 2016 at 3:12 PM, Dan Williams <dan.j.williams@intel.com> wrote: >> > On Tue, Jul 12, 2016 at 7:57 AM, Peter Zijlstra <peterz@infradead.org> wrote: >> >> On Sat, Jul 09, 2016 at 08:25:54PM -0700, Dan Williams wrote: >> >>> The pcommit instruction is being deprecated in favor of either ADR >> >>> (asynchronous DRAM refresh: flush-on-power-fail) at the platform level, or >> >>> posted-write-queue flush addresses as defined by the ACPI 6.x NFIT (NVDIMM >> >>> Firmware Interface Table). >> >> >> >>> arch/x86/include/asm/cpufeatures.h | 1 >> >>> arch/x86/include/asm/special_insns.h | 46 -------------------- >> >>> arch/x86/lib/x86-opcode-map.txt | 2 - >> >>> tools/objtool/arch/x86/insn/x86-opcode-map.txt | 2 - >> >>> tools/perf/arch/x86/tests/insn-x86-dat-32.c | 2 - >> >>> tools/perf/arch/x86/tests/insn-x86-dat-64.c | 2 - >> >>> tools/perf/arch/x86/tests/insn-x86-dat-src.c | 4 -- >> >> >> >> Just deprecated, or is it completely eradicated, removed from history, >> >> will never ever happen and we'll reissue the opcode for something else? >> >> >> >> Because if its only deprecated then removing it from the instruction >> >> decoders seems wrong, old binaries might still contain the opcode. >> > >> > Eradicated. >> > >> > "The new instructions like CLWB and CLFLUSHOPT will be rolled into the >> > SDM but PCOMMIT will be removed from the Extensions doc and not rolled >> > into the SDM." [1] >> > >> > Existing binaries are already gating their usage on the presence of >> > the cpu id flag, that flag and the instruction opcode are reserved >> > going forward. >> > >> > [1]: https://lists.01.org/pipermail/linux-nvdimm/2016-June/005923.html >> >> x86 maintainers, I have the other patches in this series queued in -next. Please >> ack this one and I'll add it for v4.8-rc1, or otherwise let me know how you want >> to handle this patch. > > Since it's just a removal AFAICS that the rest of your series should not depend > on, can you submit it to the x86 tree? This patch depends on the previous patches in the series removing calls to pcommit_sfence().
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[PATCH v2 16/17] x86/insn: remove pcommit Dan Williams <dan.j.williams@intel.com> - 2016-07-10 05:30 +0200
Re: [PATCH v2 16/17] x86/insn: remove pcommit Peter Zijlstra <peterz@infradead.org> - 2016-07-12 17:00 +0200
Re: [PATCH v2 16/17] x86/insn: remove pcommit Dan Williams <dan.j.williams@intel.com> - 2016-07-13 00:20 +0200
Re: [PATCH v2 16/17] x86/insn: remove pcommit Dan Williams <dan.j.williams@intel.com> - 2016-07-22 18:00 +0200
Re: [PATCH v2 16/17] x86/insn: remove pcommit Ingo Molnar <mingo@kernel.org> - 2016-07-22 19:00 +0200
Re: [PATCH v2 16/17] x86/insn: remove pcommit Dan Williams <dan.j.williams@intel.com> - 2016-07-23 03:00 +0200
Re: [PATCH v2 16/17] x86/insn: remove pcommit Ingo Molnar <mingo@kernel.org> - 2016-07-23 09:50 +0200
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