summaryrefslogtreecommitdiff
path: root/include/linux/compiler-gcc.h
diff options
context:
space:
mode:
authorLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
committerLinus Torvalds <torvalds@ppc970.osdl.org>2005-04-17 02:20:36 +0400
commit1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 (patch)
tree0bba044c4ce775e45a88a51686b5d9f90697ea9d /include/linux/compiler-gcc.h
downloadlinux-1da177e4c3f41524e886b7f1b8a0c1fc7321cac2.tar.xz
Linux-2.6.12-rc2v2.6.12-rc2
Initial git repository build. I'm not bothering with the full history, even though we have it. We can create a separate "historical" git archive of that later if we want to, and in the meantime it's about 3.2GB when imported into git - space that would just make the early git days unnecessarily complicated, when we don't have a lot of good infrastructure for it. Let it rip!
Diffstat (limited to 'include/linux/compiler-gcc.h')
-rw-r--r--include/linux/compiler-gcc.h17
1 files changed, 17 insertions, 0 deletions
diff --git a/include/linux/compiler-gcc.h b/include/linux/compiler-gcc.h
new file mode 100644
index 000000000000..152734055403
--- /dev/null
+++ b/include/linux/compiler-gcc.h
@@ -0,0 +1,17 @@
+/* Never include this file directly. Include <linux/compiler.h> instead. */
+
+/*
+ * Common definitions for all gcc versions go here.
+ */
+
+
+/* Optimization barrier */
+/* The "volatile" is due to gcc bugs */
+#define barrier() __asm__ __volatile__("": : :"memory")
+
+/* This macro obfuscates arithmetic on a variable address so that gcc
+ shouldn't recognize the original var, and make assumptions about it */
+#define RELOC_HIDE(ptr, off) \
+ ({ unsigned long __ptr; \
+ __asm__ ("" : "=g"(__ptr) : "0"(ptr)); \
+ (typeof(ptr)) (__ptr + (off)); })