[glibc] riscv32: Specify the arch_minimum_kernel as 5.4

[glibc] riscv32: Specify the arch_minimum_kernel as 5.4

[Alistair Francis]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=7a55dd3fb6d2c307a002a16776be84310b9c8989

commit 7a55dd3fb6d2c307a002a16776be84310b9c8989
Author: Alistair Francis <alistair.francis@wdc.com>
Date:   Fri Dec 20 18:29:42 2019 -0800

    riscv32: Specify the arch_minimum_kernel as 5.4
    
    Specify the minimum kernel version for RISC-V 32-bit as the 5.4 kernel.
    We require this commit: "waitid: Add support for waiting for the current
    process group" for the kernel as it adds support for the P_PGID id for
    the waitid syscall.  Without this patch we can't replace the wait4
    syscall on 64-bit time_t only systems.
    
    Reviewed-by: Maciej W. Rozycki <macro@wdc.com>

Diff:
---
 sysdeps/unix/sysv/linux/riscv/configure    | 4 ++++
 sysdeps/unix/sysv/linux/riscv/configure.ac | 4 ++++
 2 files changed, 8 insertions(+)

diff --git a/sysdeps/unix/sysv/linux/riscv/configure b/sysdeps/unix/sysv/linux/riscv/configure
index 3018ca8f1b..de3bb62003 100755
--- a/sysdeps/unix/sysv/linux/riscv/configure
+++ b/sysdeps/unix/sysv/linux/riscv/configure
@@ -151,6 +151,10 @@ if test $libc_cv_riscv_int_abi = no; then
   as_fn_error $? "Unable to determine integer ABI" "$LINENO" 5
 fi
 
+if test $libc_cv_riscv_int_abi = ilp32; then
+  arch_minimum_kernel=5.4.0
+fi
+
 libc_cv_riscv_float_abi=no
 cat confdefs.h - <<_ACEOF >conftest.$ac_ext
 /* end confdefs.h.  */
diff --git a/sysdeps/unix/sysv/linux/riscv/configure.ac b/sysdeps/unix/sysv/linux/riscv/configure.ac
index d4819931ca..0f7596502b 100644
--- a/sysdeps/unix/sysv/linux/riscv/configure.ac
+++ b/sysdeps/unix/sysv/linux/riscv/configure.ac
@@ -11,6 +11,10 @@ if test $libc_cv_riscv_int_abi = no; then
   AC_MSG_ERROR([Unable to determine integer ABI])
 fi
 
+if test $libc_cv_riscv_int_abi = ilp32; then
+  arch_minimum_kernel=5.4.0
+fi
+
 libc_cv_riscv_float_abi=no
 AC_EGREP_CPP(yes, [#ifdef __riscv_float_abi_double
 		   yes