Re: [Qemu-devel] [PATCH] linux-user: set minimum uname for RISC-V

[Peter Maydell]

On 24 April 2018 at 17:40, Palmer Dabbelt <address@hidden> wrote:
> On Tue, 24 Apr 2018 09:03:29 PDT (-0700), address@hidden wrote:
>>
>> As support was merged into the mainline kernel at 4.15 it is unlikely
>> 3.8.0 is the correct value. Indeed when I testing binaries created by
>> the current Debian SID compiler the tests failed with:
>>
>>   FATAL: kernel too old
>>
>> Signed-off-by: Alex Bennée <address@hidden>
>> ---
>>  linux-user/riscv/target_syscall.h | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)
>>
>> diff --git a/linux-user/riscv/target_syscall.h
>> b/linux-user/riscv/target_syscall.h
>> index d4e109a27f..ee81d8bc88 100644
>> --- a/linux-user/riscv/target_syscall.h
>> +++ b/linux-user/riscv/target_syscall.h
>> @@ -45,7 +45,7 @@ struct target_pt_regs {
>>  #else
>>  #define UNAME_MACHINE "riscv64"
>>  #endif
>> -#define UNAME_MINIMUM_RELEASE "3.8.0"
>> +#define UNAME_MINIMUM_RELEASE "4.15.0"
>>
>>  #define TARGET_MINSIGSTKSZ 2048
>>  #define TARGET_MLOCKALL_MCL_CURRENT 1
>
>
> If I understand this correctly, this will make host kernels older than
> 4.15.0 look like 4.15.0 when a program running in user-mode emulation on a
> RISC-V system?

Yes. Typically you want to set this to whatever glibc has
baked in as its arch_minimum_kernel, which in this case
does seem to be 4.15.0:

https://sourceware.org/git/?p=glibc.git;a=blob;f=sysdeps/unix/sysv/linux/riscv/configure.ac;h=4fae013ec91451370a6d14b15b7e6d37fcd669af;hb=HEAD

thanks
-- PMM