x86, syscall: Allow syscall offset to be symbolic

Allow the specified syscall offset to be symbolic, e.g. a macro.  For
offset system calls, this if nothing else makes the generated code
easier to read.

Suggested-by: H. J. Lu <hjl.tools@gmail.com>
Link: http://lkml.kernel.org/r/1321569446-20433-7-git-send-email-hpa@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>

1 files changed, 5 insertions, 1 deletions

diff --git a/arch/x86/syscalls/syscallhdr.sh b/arch/x86/syscalls/syscallhdr.sh
index b3c593072785..31fd5f1f38f7 100644
--- a/arch/x86/syscalls/syscallhdr.sh
+++ b/arch/x86/syscalls/syscallhdr.sh
@@ -15,7 +15,11 @@ grep -E "^[0-9A-Fa-fXx]+[[:space:]]+${my_abis}" "$in" | sort -n | (
     echo ""
 
     while read nr abi name entry ; do
-        echo "#define __NR_${prefix}${name}" $((nr+offset))
+        if [ -z "$offset" ]; then
+            echo "#define __NR_${prefix}${name} $nr"
+        else
+            echo "#define __NR_${prefix}${name} ($offset + $nr)"
+        fi
     done
 
     echo ""