linux-kernel - [tip:x86/syscall] x86, syscall: Allow syscall offset to be symbolic

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Message-ID: <tip-3f86886c72fb68088162c7e08cc7f85282f1860c@git.kernel.org>
Date:	Fri, 18 Nov 2011 17:07:42 -0800
From:	"tip-bot for H. Peter Anvin" <hpa@...ux.intel.com>
To:	linux-tip-commits@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, hpa@...or.com, mingo@...hat.com,
	tglx@...utronix.de, hpa@...ux.intel.com, hjl.tools@...il.com
Subject: [tip:x86/syscall] x86, syscall: Allow syscall offset to be symbolic

Commit-ID:  3f86886c72fb68088162c7e08cc7f85282f1860c
Gitweb:     http://git.kernel.org/tip/3f86886c72fb68088162c7e08cc7f85282f1860c
Author:     H. Peter Anvin <hpa@...ux.intel.com>
AuthorDate: Fri, 18 Nov 2011 17:01:19 -0800
Committer:  H. Peter Anvin <hpa@...ux.intel.com>
CommitDate: Fri, 18 Nov 2011 17:01:19 -0800

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@...il.com>
Link: http://lkml.kernel.org/r/1321569446-20433-7-git-send-email-hpa@linux.intel.com
Signed-off-by: H. Peter Anvin <hpa@...ux.intel.com>
---
 arch/x86/syscalls/syscallhdr.sh |    6 +++++-
 1 files changed, 5 insertions(+), 1 deletions(-)

diff --git a/arch/x86/syscalls/syscallhdr.sh b/arch/x86/syscalls/syscallhdr.sh
index b3c5930..31fd5f1 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 ""
--
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