[S390] Wire up sys_fallocate.
This patch implements support of fallocate system call on s390(x)
platform. A wrapper is added to address the issue which s390 ABI has with
the arguments of this system call.
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index acc4154..6ee1bed 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1710,3 +1710,13 @@
sys_eventfd_wrapper:
llgfr %r2,%r2 # unsigned int
jg sys_eventfd
+
+ .globl sys_fallocate_wrapper
+sys_fallocate_wrapper:
+ lgfr %r2,%r2 # int
+ lgfr %r3,%r3 # int
+ sllg %r4,%r4,32 # get high word of 64bit loff_t
+ lr %r4,%r5 # get low word of 64bit loff_t
+ sllg %r5,%r6,32 # get high word of 64bit loff_t
+ l %r5,164(%r15) # get low word of 64bit loff_t
+ jg sys_fallocate