[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>

1 files changed, 20 insertions, 63 deletions

diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h
index b30606f6d523..2e05972c5085 100644
--- a/arch/s390/include/asm/bitops.h
+++ b/arch/s390/include/asm/bitops.h
@@ -71,8 +71,6 @@ extern const char _sb_findmap[];
 #define __BITOPS_AND            "nr"
 #define __BITOPS_XOR            "xr"
 
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
-
 #define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
         asm volatile(                                           \
                 "       l       %0,%2\n"                        \
@@ -85,22 +83,6 @@ extern const char _sb_findmap[];
                 : "d" (__val), "Q" (*(unsigned long *) __addr)  \
                 : "cc");
 
-#else /* __GNUC__ */
-
-#define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
-        asm volatile(                                           \
-                "       l       %0,0(%4)\n"                     \
-                "0:     lr      %1,%0\n"                        \
-                __op_string "   %1,%3\n"                        \
-                "       cs      %0,%1,0(%4)\n"                  \
-                "       jl      0b"                             \
-                : "=&d" (__old), "=&d" (__new),                 \
-                  "=m" (*(unsigned long *) __addr)              \
-                : "d" (__val), "a" (__addr),                    \
-                  "m" (*(unsigned long *) __addr) : "cc");
-
-#endif /* __GNUC__ */
-
 #else /* __s390x__ */
 
 #define __BITOPS_ALIGN          7
@@ -109,8 +91,6 @@ extern const char _sb_findmap[];
 #define __BITOPS_AND            "ngr"
 #define __BITOPS_XOR            "xgr"
 
-#if __GNUC__ > 3 || (__GNUC__ == 3 && __GNUC_MINOR__ > 2)
-
 #define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
         asm volatile(                                           \
                 "       lg      %0,%2\n"                        \
@@ -123,23 +103,6 @@ extern const char _sb_findmap[];
                 : "d" (__val), "Q" (*(unsigned long *) __addr)  \
                 : "cc");
 
-#else /* __GNUC__ */
-
-#define __BITOPS_LOOP(__old, __new, __addr, __val, __op_string) \
-        asm volatile(                                           \
-                "       lg      %0,0(%4)\n"                     \
-                "0:     lgr     %1,%0\n"                        \
-                __op_string "   %1,%3\n"                        \
-                "       csg     %0,%1,0(%4)\n"                  \
-                "       jl      0b"                             \
-                : "=&d" (__old), "=&d" (__new),                 \
-                  "=m" (*(unsigned long *) __addr)              \
-                : "d" (__val), "a" (__addr),                    \
-                  "m" (*(unsigned long *) __addr) : "cc");
-
-
-#endif /* __GNUC__ */
-
 #endif /* __s390x__ */
 
 #define __BITOPS_WORDS(bits) (((bits)+__BITOPS_WORDSIZE-1)/__BITOPS_WORDSIZE)
@@ -261,9 +224,8 @@ static inline void __set_bit(unsigned long nr, volatile unsigned long *ptr)
 
         addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
         asm volatile(
-                "       oc      0(1,%1),0(%2)"
-                : "=m" (*(char *) addr) : "a" (addr),
-                  "a" (_oi_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc" );
+                "       oc      %O0(1,%R0),%1"
+                : "=Q" (*(char *) addr) : "Q" (_oi_bitmap[nr & 7]) : "cc" );
 }
 
 static inline void 
@@ -290,9 +252,8 @@ __clear_bit(unsigned long nr, volatile unsigned long *ptr)
 
         addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
         asm volatile(
-                "       nc      0(1,%1),0(%2)"
-                : "=m" (*(char *) addr) : "a" (addr),
-                  "a" (_ni_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc");
+                "       nc      %O0(1,%R0),%1"
+                : "=Q" (*(char *) addr) : "Q" (_ni_bitmap[nr & 7]) : "cc" );
 }
 
 static inline void 
@@ -318,9 +279,8 @@ static inline void __change_bit(unsigned long nr, volatile unsigned long *ptr)
 
         addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
         asm volatile(
-                "       xc      0(1,%1),0(%2)"
-                :  "=m" (*(char *) addr) : "a" (addr),
-                   "a" (_oi_bitmap + (nr & 7)), "m" (*(char *) addr) : "cc" );
+                "       xc      %O0(1,%R0),%1"
+                : "=Q" (*(char *) addr) : "Q" (_oi_bitmap[nr & 7]) : "cc" );
 }
 
 static inline void 
@@ -349,10 +309,9 @@ test_and_set_bit_simple(unsigned long nr, volatile unsigned long *ptr)
         addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
         ch = *(unsigned char *) addr;
         asm volatile(
-                "       oc      0(1,%1),0(%2)"
-                : "=m" (*(char *) addr)
-                : "a" (addr), "a" (_oi_bitmap + (nr & 7)),
-                  "m" (*(char *) addr) : "cc", "memory");
+                "       oc      %O0(1,%R0),%1"
+                : "=Q" (*(char *) addr) : "Q" (_oi_bitmap[nr & 7])
+                : "cc", "memory");
         return (ch >> (nr & 7)) & 1;
 }
 #define __test_and_set_bit(X,Y)         test_and_set_bit_simple(X,Y)
@@ -369,10 +328,9 @@ test_and_clear_bit_simple(unsigned long nr, volatile unsigned long *ptr)
         addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
         ch = *(unsigned char *) addr;
         asm volatile(
-                "       nc      0(1,%1),0(%2)"
-                : "=m" (*(char *) addr)
-                : "a" (addr), "a" (_ni_bitmap + (nr & 7)),
-                  "m" (*(char *) addr) : "cc", "memory");
+                "       nc      %O0(1,%R0),%1"
+                : "=Q" (*(char *) addr) : "Q" (_ni_bitmap[nr & 7])
+                : "cc", "memory");
         return (ch >> (nr & 7)) & 1;
 }
 #define __test_and_clear_bit(X,Y)       test_and_clear_bit_simple(X,Y)
@@ -389,10 +347,9 @@ test_and_change_bit_simple(unsigned long nr, volatile unsigned long *ptr)
         addr = (unsigned long) ptr + ((nr ^ (__BITOPS_WORDSIZE - 8)) >> 3);
         ch = *(unsigned char *) addr;
         asm volatile(
-                "       xc      0(1,%1),0(%2)"
-                : "=m" (*(char *) addr)
-                : "a" (addr), "a" (_oi_bitmap + (nr & 7)),
-                  "m" (*(char *) addr) : "cc", "memory");
+                "       xc      %O0(1,%R0),%1"
+                : "=Q" (*(char *) addr) : "Q" (_oi_bitmap[nr & 7])
+                : "cc", "memory");
         return (ch >> (nr & 7)) & 1;
 }
 #define __test_and_change_bit(X,Y)      test_and_change_bit_simple(X,Y)
@@ -591,11 +548,11 @@ static inline unsigned long __load_ulong_le(const unsigned long *p,
         p = (unsigned long *)((unsigned long) p + offset);
 #ifndef __s390x__
         asm volatile(
-                "       ic      %0,0(%1)\n"
-                "       icm     %0,2,1(%1)\n"
-                "       icm     %0,4,2(%1)\n"
-                "       icm     %0,8,3(%1)"
-                : "=&d" (word) : "a" (p), "m" (*p) : "cc");
+                "       ic      %0,%O1(%R1)\n"
+                "       icm     %0,2,%O1+1(%R1)\n"
+                "       icm     %0,4,%O1+2(%R1)\n"
+                "       icm     %0,8,%O1+3(%R1)"
+                : "=&d" (word) : "Q" (*p) : "cc");
 #else
         asm volatile(
                 "       lrvg    %0,%1"