Linux-2.6.12-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!
diff --git a/include/linux/circ_buf.h b/include/linux/circ_buf.h
new file mode 100644
index 0000000..a2ed059
--- /dev/null
+++ b/include/linux/circ_buf.h
@@ -0,0 +1,32 @@
+#ifndef _LINUX_CIRC_BUF_H
+#define _LINUX_CIRC_BUF_H 1
+
+struct circ_buf {
+ char *buf;
+ int head;
+ int tail;
+};
+
+/* Return count in buffer. */
+#define CIRC_CNT(head,tail,size) (((head) - (tail)) & ((size)-1))
+
+/* Return space available, 0..size-1. We always leave one free char
+ as a completely full buffer has head == tail, which is the same as
+ empty. */
+#define CIRC_SPACE(head,tail,size) CIRC_CNT((tail),((head)+1),(size))
+
+/* Return count up to the end of the buffer. Carefully avoid
+ accessing head and tail more than once, so they can change
+ underneath us without returning inconsistent results. */
+#define CIRC_CNT_TO_END(head,tail,size) \
+ ({int end = (size) - (tail); \
+ int n = ((head) + end) & ((size)-1); \
+ n < end ? n : end;})
+
+/* Return space available up to the end of the buffer. */
+#define CIRC_SPACE_TO_END(head,tail,size) \
+ ({int end = (size) - 1 - (head); \
+ int n = (end + (tail)) & ((size)-1); \
+ n <= end ? n : end+1;})
+
+#endif /* _LINUX_CIRC_BUF_H */
