From: Alan Cox <alan@linux.intel.com>
Date: Thu, 14 Dec 2017 21:31:10 +0000 (+0000)
Subject: inode: do some more pipe maths in 16bit
X-Git-Url: https://git.ndcode.org/public/gitweb.cgi?a=commitdiff_plain;h=889a17f1a1595774cc433a507eee06ae8c30a503;p=FUZIX.git

inode: do some more pipe maths in 16bit
---

diff --git a/Kernel/inode.c b/Kernel/inode.c
index 240c37cd..3e904bd1 100644
--- a/Kernel/inode.c
+++ b/Kernel/inode.c
@@ -12,16 +12,17 @@
 
 /* This assumes it's called once before we do I/O. That's wrong and we
    need to integrate this into the I/O loop, but when we do it changes
-   how we handle the psleep_flags bit */
+   how we handle the psleep_flags bit. Pipes wrap before 64k so we can
+   shorten the check */
 static uint8_t pipewait(inoptr ino, uint8_t flag)
 {
-        while(ino->c_node.i_size == 0) {
+        while((uint16_t)ino->c_node.i_size == 0) {
                 if (ino->c_writers == 0 || psleep_flags(ino, flag)) {
                         udata.u_count = 0;
                         return 0;
                 }
         }
-	udata.u_count = min(udata.u_count, ino->c_node.i_size);
+	udata.u_count = min(udata.u_count, (uint16_t)ino->c_node.i_size);
         return 1;
 }