**** Merged from HEAD ****

Use `(1L << feature)' instead of `(1 << feature)' to avoid problems
with integer overflows when we add more fields.

sysdeps/linux/shm_limits.c

@@ -27,9 +27,9 @@
 #include <sys/shm.h>
 
 static unsigned long _glibtop_sysdeps_shm_limits =
-(1 << GLIBTOP_IPC_SHMMAX) + (1 << GLIBTOP_IPC_SHMMIN) +
-(1 << GLIBTOP_IPC_SHMMNI) + (1 << GLIBTOP_IPC_SHMSEG) +
-(1 << GLIBTOP_IPC_SHMALL);
+(1L << GLIBTOP_IPC_SHMMAX) + (1L << GLIBTOP_IPC_SHMMIN) +
+(1L << GLIBTOP_IPC_SHMMNI) + (1L << GLIBTOP_IPC_SHMSEG) +
+(1L << GLIBTOP_IPC_SHMALL);
 
 /* Init function. */