extricate bits/sem.h from x32 time_t hack

various padding fields in the generic bits/sem.h were defined in terms
of time_t as a cheap hack standing in for "kernel long", to allow x32
to use the generic version of the file. this was a really bad idea, as
it ended up getting copied into lots of arch-specific versions of the
bits file, and is a blocker to changing time_t to 64-bit on 32-bit
archs.

this commit adds an x32-specific version of the header, and changes
padding type back from time_t to long (currently the same type on all
archs but x32) in the generic header and all the others the hack got
copied into.

arch/aarch64/bits/sem.h

@@ -4,11 +4,11 @@ struct semid_ds {
 	time_t sem_ctime;
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 	unsigned short sem_nsems;
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 #else
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 	unsigned short sem_nsems;
 #endif
-	time_t __unused3;
-	time_t __unused4;
+	long __unused3;
+	long __unused4;
 };

arch/generic/bits/sem.h

@@ -1,16 +1,16 @@
 struct semid_ds {
 	struct ipc_perm sem_perm;
 	time_t sem_otime;
-	time_t __unused1;
+	long __unused1;
 	time_t sem_ctime;
-	time_t __unused2;
+	long __unused2;
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 	unsigned short sem_nsems;
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 #else
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 	unsigned short sem_nsems;
 #endif
-	time_t __unused3;
-	time_t __unused4;
+	long __unused3;
+	long __unused4;
 };

arch/mips/bits/sem.h

@@ -4,11 +4,11 @@ struct semid_ds {
 	time_t sem_ctime;
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 	unsigned short sem_nsems;
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 #else
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 	unsigned short sem_nsems;
 #endif
-	time_t __unused3;
-	time_t __unused4;
+	long __unused3;
+	long __unused4;
 };

arch/mips64/bits/sem.h

@@ -4,11 +4,11 @@ struct semid_ds {
 	time_t sem_ctime;
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 	unsigned short sem_nsems;
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 #else
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 	unsigned short sem_nsems;
 #endif
-	time_t __unused3;
-	time_t __unused4;
+	long __unused3;
+	long __unused4;
 };

arch/mipsn32/bits/sem.h

@@ -4,11 +4,11 @@ struct semid_ds {
 	time_t sem_ctime;
 #if __BYTE_ORDER == __LITTLE_ENDIAN
 	unsigned short sem_nsems;
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 #else
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
 	unsigned short sem_nsems;
 #endif
-	time_t __unused3;
-	time_t __unused4;
+	long __unused3;
+	long __unused4;
 };

arch/riscv64/bits/sem.h

@@ -3,7 +3,7 @@ struct semid_ds {
 	time_t sem_otime;
 	time_t sem_ctime;
 	unsigned short sem_nsems;
-	char __sem_nsems_pad[sizeof(time_t)-sizeof(short)];
-	time_t __unused3;
-	time_t __unused4;
+	char __sem_nsems_pad[sizeof(long)-sizeof(short)];
+	long __unused3;
+	long __unused4;
 };

arch/x32/bits/sem.h

@@ -0,0 +1,11 @@
+struct semid_ds {
+	struct ipc_perm sem_perm;
+	time_t sem_otime;
+	long long __unused1;
+	time_t sem_ctime;
+	long long __unused2;
+	unsigned short sem_nsems;
+	char __sem_nsems_pad[sizeof(long long)-sizeof(short)];
+	long long __unused3;
+	long long __unused4;
+};