Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1222273 > unrolled thread
| Started by | Dave Martin <Dave.Martin@arm.com> |
|---|---|
| First post | 2015-09-10 18:00 +0200 |
| Last post | 2015-09-10 18:00 +0200 |
| Articles | 1 — 1 participant |
Back to article view | Back to linux.kernel
This discussion starts older than the indexed window; earlier articles aren't shown. The article labeled Started by
below is the oldest one visible, not the original post.
Re: [RFC PATCH 01/10] arm64: feature registers: Documentation Dave Martin <Dave.Martin@arm.com> - 2015-09-10 18:00 +0200
| From | Dave Martin <Dave.Martin@arm.com> |
|---|---|
| Date | 2015-09-10 18:00 +0200 |
| Subject | Re: [RFC PATCH 01/10] arm64: feature registers: Documentation |
| Message-ID | <q7cqu-5Zm-23@gated-at.bofh.it> |
On Tue, Aug 11, 2015 at 04:37:46PM +0100, Suzuki K. Poulose wrote: > On 11/08/15 15:23, Catalin Marinas wrote: > >On Mon, Aug 10, 2015 at 07:48:48PM +0200, Ard Biesheuvel wrote: > >>>On 10/08/15 17:06, Catalin Marinas wrote: > >>>>And to debunk some of the counter arguments: > >>>> > >>>>a) Running out of HWCAP bits - I really doubt this, we can always > >>>> introduce 64 more via a new elf_hwcapX > >> > >>Note that ELF_HWCAP is also wired into ifunc resolution of GNU > >>indirect functions, which looks like a useful feature although it > >>isn't used that widely yet. > > > >I forgot to mention, we also need an HWCAP_CPUID with these patches when > >we expose the MRS interface. The ifunc resolver could use MRS when > >available. But I would still keep adding HWCAP bits for new features, > >even if we risk running out of the 64-bit we have now. > > > > Sure, I will add the HWCAP_CPUID in the next version of the series. +1 Playing with this, I realise that I get a splat if my userspace code tries to do an MRS for an ID register when this series is absent -- we need an hwcap that we can check first. Cheers ---Dave -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
Back to top | Article view | linux.kernel
csiph-web