On Fri, Jul 22, 2016 at 9:52 AM, Ingo Molnar <mingo@xxxxxxxxxx> wrote: > > * Dan Williams <dan.j.williams@xxxxxxxxx> wrote: > >> On Tue, Jul 12, 2016 at 3:12 PM, Dan Williams <dan.j.williams@xxxxxxxxx> wrote: >> > On Tue, Jul 12, 2016 at 7:57 AM, Peter Zijlstra <peterz@xxxxxxxxxxxxx> 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(). -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
