于 2019年10月24日 GMT+08:00 下午12:06:24, Paul Burton <paulburton@xxxxxxxxxx> 写到: >Hi Jiaxun, > >On Wed, Oct 23, 2019 at 11:25:51PM +0800, Jiaxun Yang wrote: >> After further discussion with userland library develpoer, >> we addressed another two ASEs that can be used runtimely in programs. >> >> Export them in hwcap as well to benefit userspace programs. >> >> Signed-off-by: Jiaxun Yang <jiaxun.yang@xxxxxxxxxxx> >> Cc: <stable@xxxxxxxxxxxxxxx> # 4.4+ >> --- >> arch/mips/include/uapi/asm/hwcap.h | 2 ++ >> arch/mips/kernel/cpu-probe.c | 7 ++++++- >> 2 files changed, 8 insertions(+), 1 deletion(-) >> >> diff --git a/arch/mips/include/uapi/asm/hwcap.h >b/arch/mips/include/uapi/asm/hwcap.h >> index 1ade1daa4921..e1a9bac62149 100644 >> --- a/arch/mips/include/uapi/asm/hwcap.h >> +++ b/arch/mips/include/uapi/asm/hwcap.h >> @@ -17,5 +17,7 @@ >> #define HWCAP_LOONGSON_MMI (1 << 11) >> #define HWCAP_LOONGSON_EXT (1 << 12) >> #define HWCAP_LOONGSON_EXT2 (1 << 13) >> +#define HWCAP_MIPS_MICROMIPS (1 << 14) >> +#define HWCAP_MIPS_VZ (1 << 15) > >What's the motivation for exposing VZ? Userland can't actually use it >without something like KVM, which already exposes a means of detecting >whether VZ is supported (try the creating a VM of type KVM_VM_MIPS_VZ & >see if it works). I'm not sure what userland would be able to do with >this information in AT_HWCAP Hi Paul, Well, that was preposed by a kvm developer from Loongson. They want to use it to implement CPU_AUTOPROBE and load required modules automatically. As they said they will submit KVM support to mainline later, I'm just occupied a place for them. Out of tree commit: http://cgit.loongnix.org/cgit/linux-3.10/commit/?id=4db9301cca3b49358d46fd0da67c01ab2ae4a3e3 -- Jiaxun Yang
