[PATCH] arm64/sve: Reserve HWCAP and ELF note numbers for SVE

[Alan Hayward]

> On 8 Mar 2017, at 12:20, Dave Martin <Dave.Martin at arm.com> wrote:
>
> On Mon, Mar 06, 2017 at 03:24:47PM +0000, Catalin Marinas wrote:
>> On Fri, Mar 03, 2017 at 02:13:26PM +0000, Dave P Martin wrote:
>>> --- a/include/uapi/linux/elf.h
>>> +++ b/include/uapi/linux/elf.h
>>> @@ -414,6 +414,7 @@ typedef struct elf64_shdr {
>>> #define NT_ARM_HW_BREAK0x402/* ARM hardware breakpoint registers */
>>> #define NT_ARM_HW_WATCH0x403/* ARM hardware watchpoint registers */
>>> #define NT_ARM_SYSTEM_CALL0x404/* ARM system call number */
>>> +/* 0x405 reserved for SVE */
>>
>> Just a nitpick: given that this is generic file, even if it's in the
>> ARM-specific section, it might be worth adding "ARM" to the comment:
>> "reserved for ARM SVE" (not needed for hwcap).
>
> Will do.
>
>> Depending on the SVE merging timescales, this patch may go in together
>> with the rest ;).
>
> I need to respin this, because HWCAP_CPUID and HWCAP_ASIMDRDM went in
> first (my bad, should have seen those in flight) -- since we are only
> at -rc1 those could be renumbered, but it's probably not worth the
> associated risks.
>
> In any case, NT_ARM_SVE was the more important reservation.
>
> Yao, Alan, does gdb make any use of HWCAP_SVE?

It exists in binutils, but neither binutils nor gdb make use of it yet.

>
> Cheers
> ---Dave

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