[S390] use inline assembly contraints available with gcc 3.3.3
Drop support to compile the kernel with gcc versions older than 3.3.3.
This allows us to use the "Q" inline assembly contraint on some more
inline assemblies without duplicating a lot of complex code (e.g. __xchg
and __cmpxchg). The distinction for older gcc versions can be removed
which saves a few lines and simplifies the code.
Reviewed-by: Heiko Carstens <heiko.carstens@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/include/asm/timex.h b/arch/s390/include/asm/timex.h
index 68d9fea..f174bda 100644
--- a/arch/s390/include/asm/timex.h
+++ b/arch/s390/include/asm/timex.h
@@ -20,10 +20,10 @@
int cc;
asm volatile(
- " sck 0(%2)\n"
+ " sck %1\n"
" ipm %0\n"
" srl %0,28\n"
- : "=d" (cc) : "m" (time), "a" (&time) : "cc");
+ : "=d" (cc) : "Q" (time) : "cc");
return cc;
}
@@ -32,21 +32,21 @@
int cc;
asm volatile(
- " stck 0(%2)\n"
+ " stck %1\n"
" ipm %0\n"
" srl %0,28\n"
- : "=d" (cc), "=m" (*time) : "a" (time) : "cc");
+ : "=d" (cc), "=Q" (*time) : : "cc");
return cc;
}
static inline void set_clock_comparator(__u64 time)
{
- asm volatile("sckc 0(%1)" : : "m" (time), "a" (&time));
+ asm volatile("sckc %0" : : "Q" (time));
}
static inline void store_clock_comparator(__u64 *time)
{
- asm volatile("stckc 0(%1)" : "=m" (*time) : "a" (time));
+ asm volatile("stckc %0" : "=Q" (*time));
}
#define CLOCK_TICK_RATE 1193180 /* Underlying HZ */
@@ -57,11 +57,7 @@
{
unsigned long long clk;
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
asm volatile("stck %0" : "=Q" (clk) : : "cc");
-#else /* __GNUC__ */
- asm volatile("stck 0(%1)" : "=m" (clk) : "a" (&clk) : "cc");
-#endif /* __GNUC__ */
return clk;
}
@@ -69,13 +65,7 @@
{
unsigned char clk[16];
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
asm volatile("stcke %0" : "=Q" (clk) : : "cc");
-#else /* __GNUC__ */
- asm volatile("stcke 0(%1)" : "=m" (clk)
- : "a" (clk) : "cc");
-#endif /* __GNUC__ */
-
return *((unsigned long long *)&clk[1]);
}