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authorMartin Schwidefsky <schwidefsky@de.ibm.com>2010-02-26 22:37:31 +0100
committerMartin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com>2010-02-26 22:37:30 +0100
commit987bcdacb18a3adc2a48d85c9b005069c2f4dd7b (patch)
tree65da88589e2c95a4677090b570f49402e870e573 /arch/s390/kernel
parentd1bf85902c28dd990c08f1703ea94109223549a7 (diff)
[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>
Diffstat (limited to 'arch/s390/kernel')
-rw-r--r--arch/s390/kernel/asm-offsets.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/s390/kernel/asm-offsets.c b/arch/s390/kernel/asm-offsets.c
index 63e46433e81..a5850a0cfe8 100644
--- a/arch/s390/kernel/asm-offsets.c
+++ b/arch/s390/kernel/asm-offsets.c
@@ -9,6 +9,14 @@
#include <asm/vdso.h>
#include <asm/sigp.h>
+/*
+ * Make sure that the compiler is new enough. We want a compiler that
+ * is known to work with the "Q" assembler constraint.
+ */
+#if __GNUC__ < 3 || (__GNUC__ == 3 && __GNUC_MINOR__ < 3)
+#error Your compiler is too old; please use version 3.3.3 or newer
+#endif
+
int main(void)
{
DEFINE(__THREAD_info, offsetof(struct task_struct, stack));