[glibc] sysvipc: Fix tst-sysvshm-linux on x32

[Adhemerval Zanella]

https://sourceware.org/git/gitweb.cgi?p=glibc.git;h=602da9de696099f543ee2bb3c1520bc178f42fc9

commit 602da9de696099f543ee2bb3c1520bc178f42fc9
Author: Adhemerval Zanella <adhemerval.zanella@linaro.org>
Date:   Thu Oct 15 15:45:26 2020 -0300

    sysvipc: Fix tst-sysvshm-linux on x32
    
    The Linux shminfo fields are '__syscall_ulong_t' (which is 64-bit
    for x32).  This patch fixes the test to compare againt the correct
    type and to only clamp the value if '__syscall_ulong_t' is the same
    size of 'unsigned long int'.
    
    Checked on x86_64-linux-gnu-x32.

Diff:
---
 sysdeps/unix/sysv/linux/tst-sysvshm-linux.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/sysdeps/unix/sysv/linux/tst-sysvshm-linux.c b/sysdeps/unix/sysv/linux/tst-sysvshm-linux.c
index 7128ae2e14..cb32bd522e 100644
--- a/sysdeps/unix/sysv/linux/tst-sysvshm-linux.c
+++ b/sysdeps/unix/sysv/linux/tst-sysvshm-linux.c
@@ -54,9 +54,9 @@ do_prepare (int argc, char *argv[])
 
 struct test_shminfo
 {
-  unsigned long int shmall;
-  unsigned long int shmmax;
-  unsigned long int shmmni;
+  __syscall_ulong_t shmall;
+  __syscall_ulong_t shmmax;
+  __syscall_ulong_t shmmni;
 };
 
 /* It tries to obtain some system-wide SysV shared memory information from
@@ -128,7 +128,8 @@ do_test (void)
 #if LONG_MAX == INT_MAX
     /* Kernel explicit clamp the value for shmmax on compat symbol (32-bit
        binaries running on 64-bit kernels).  */
-    if (v > INT_MAX)
+    if (sizeof (__syscall_ulong_t) == sizeof (unsigned long int)
+        && v > INT_MAX)
       v = INT_MAX;
 #endif
     tipcinfo.shmmax = v;