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

[Palmer Dabbelt]

On Tue, 24 Apr 2018 12:07:43 PDT (-0700), address@hidden wrote:
> 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

Sounds good, thanks!