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charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org The 07/05/2022 18:53, Mark Brown wrote: > On Mon, Jun 20, 2022 at 01:54:47PM +0100, Mark Brown wrote: > > Currently for arm64 we expose hwcaps to userspace using the low 32 bits > > of AT_HWCAP and AT_HWCAP2. Due to the ever expanding capabilties of the > > architecture we have now allocated all the available bits in this scheme > > so we need to expand, either using the higher bits or adding a new > > AT_HWCAP3. Discussions with glibc developers suggested that AT_HWCAP3 > > would be cleaner for them so the series adopts that approach. > > This discussion appears to have ground to a halt. Szabolcs prefers > AT_HWCAP3, Catalin using the high bits of AT_HWCAP2 for now and nobody > else said anything. I don't have strong preferences either way but > wonder if it's worth defining AT_HWCAP3 even if we start allocating more > bits from AT_HWCAP2 so that it's got more time to percolate through > libcs and so on before it's actually needed. > > What should we do here? AT_HWCAP2 top bits works for me too. then i'd do AT_HWCAP3 when we run out of hwcap2 bits. i don't think defining AT_HWCAP3 without having any hwcap3 bit is very useful. this way we can postpone AT_HWCAP3 a bit and avoid issues with top bits of plain AT_HWCAP in glibc. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel