[glibc] Linux: Fix 32-bit vDSO for clock_gettime on powerpc32

[glibc] Linux: Fix 32-bit vDSO for clock_gettime on powerpc32

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=e0fc721ce600038dd390e77cfe52440707ef574d

commit e0fc721ce600038dd390e77cfe52440707ef574d
Author: maminjie <maminjie2@huawei.com>
Date:   Mon Dec 20 19:36:32 2021 +0800

    Linux: Fix 32-bit vDSO for clock_gettime on powerpc32
    
    When the clock_id is CLOCK_PROCESS_CPUTIME_ID or CLOCK_THREAD_CPUTIME_ID,
    on the 5.10 kernel powerpc 32-bit, the 32-bit vDSO is executed successfully (
    because the __kernel_clock_gettime in arch/powerpc/kernel/vdso32/gettimeofday.S
    does not support these two IDs, the 32-bit time_t syscall will be used),
    but tp32.tv_sec is equal to 0, causing the 64-bit time_t syscall to continue to be used,
    resulting in two system calls.
    
    Fix commit 72e84d1db22203e01a43268de71ea8669eca2863.
    
    Signed-off-by: maminjie  <maminjie2@huawei.com>
    Reviewed-by: Adhemerval Zanella  <adhemerval.zanella@linaro.org>

Diff:
---
 sysdeps/unix/sysv/linux/clock_gettime.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/sysdeps/unix/sysv/linux/clock_gettime.c b/sysdeps/unix/sysv/linux/clock_gettime.c
index 91df6b3d96..9c7d907325 100644
--- a/sysdeps/unix/sysv/linux/clock_gettime.c
+++ b/sysdeps/unix/sysv/linux/clock_gettime.c
@@ -53,7 +53,7 @@ __clock_gettime64 (clockid_t clock_id, struct __timespec64 *tp)
     {
       struct timespec tp32;
       r = INTERNAL_VSYSCALL_CALL (vdso_time, 2, clock_id, &tp32);
-      if (r == 0 && tp32.tv_sec > 0)
+      if (r == 0 && tp32.tv_sec >= 0)
 	{
 	  *tp = valid_timespec_to_timespec64 (tp32);
 	  return 0;