linux-kernel - [PATCH] Add definitions of USHORT

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Message-Id: <1206321750.14496.126.camel@ymzhang>
Date:	Mon, 24 Mar 2008 09:22:30 +0800
From:	"Zhang, Yanmin" <yanmin_zhang@...ux.intel.com>
To:	Andrew Morton <akpm@...ux-foundation.org>
Cc:	clameter@....com, linux-kernel@...r.kernel.org,
	penberg@...helsinki.fi, mel@....ul.ie, mpm@...enic.com,
	linux-mm@...ck.org
Subject: [PATCH] Add definitions of USHORT_MAX and others

Below is the new patch. Thanks for the comments.

---

Add definitions of USHORT_MAX and others into kernel. ipc uses it and
slub implementation might also use it.

The patch is against 2.6.25-rc6.

Signed-off-by: Zhang Yanmin <yanmin.zhang@...el.com>
Reviewed-by: Christoph Lameter <clameter@....com>

---

diff -Nraup linux-2.6.25-rc6/include/linux/kernel.h linux-2.6.25-rc6_maxshort/include/linux/kernel.h
--- linux-2.6.25-rc6/include/linux/kernel.h	2008-03-24 02:05:25.000000000 +0800
+++ linux-2.6.25-rc6_maxshort/include/linux/kernel.h	2008-03-24 02:07:27.000000000 +0800
@@ -20,6 +20,9 @@
 extern const char linux_banner[];
 extern const char linux_proc_banner[];
 
+#define USHORT_MAX	((u16)(~0U))
+#define SHORT_MAX	((s16)(USHORT_MAX>>1))
+#define SHORT_MIN	(-SHORT_MAX - 1)
 #define INT_MAX		((int)(~0U>>1))
 #define INT_MIN		(-INT_MAX - 1)
 #define UINT_MAX	(~0U)
diff -Nraup linux-2.6.25-rc6/ipc/msg.c linux-2.6.25-rc6_maxshort/ipc/msg.c
--- linux-2.6.25-rc6/ipc/msg.c	2008-03-24 02:05:25.000000000 +0800
+++ linux-2.6.25-rc6_maxshort/ipc/msg.c	2008-03-24 02:07:27.000000000 +0800
@@ -324,19 +324,19 @@ copy_msqid_to_user(void __user *buf, str
 		out.msg_rtime		= in->msg_rtime;
 		out.msg_ctime		= in->msg_ctime;
 
-		if (in->msg_cbytes > USHRT_MAX)
-			out.msg_cbytes	= USHRT_MAX;
+		if (in->msg_cbytes > USHORT_MAX)
+			out.msg_cbytes	= USHORT_MAX;
 		else
 			out.msg_cbytes	= in->msg_cbytes;
 		out.msg_lcbytes		= in->msg_cbytes;
 
-		if (in->msg_qnum > USHRT_MAX)
-			out.msg_qnum	= USHRT_MAX;
+		if (in->msg_qnum > USHORT_MAX)
+			out.msg_qnum	= USHORT_MAX;
 		else
 			out.msg_qnum	= in->msg_qnum;
 
-		if (in->msg_qbytes > USHRT_MAX)
-			out.msg_qbytes	= USHRT_MAX;
+		if (in->msg_qbytes > USHORT_MAX)
+			out.msg_qbytes	= USHORT_MAX;
 		else
 			out.msg_qbytes	= in->msg_qbytes;
 		out.msg_lqbytes		= in->msg_qbytes;
diff -Nraup linux-2.6.25-rc6/ipc/util.c linux-2.6.25-rc6_maxshort/ipc/util.c
--- linux-2.6.25-rc6/ipc/util.c	2008-03-24 02:05:25.000000000 +0800
+++ linux-2.6.25-rc6_maxshort/ipc/util.c	2008-03-24 02:07:27.000000000 +0800
@@ -84,8 +84,8 @@ void ipc_init_ids(struct ipc_ids *ids)
 	ids->seq = 0;
 	{
 		int seq_limit = INT_MAX/SEQ_MULTIPLIER;
-		if(seq_limit > USHRT_MAX)
-			ids->seq_max = USHRT_MAX;
+		if(seq_limit > USHORT_MAX)
+			ids->seq_max = USHORT_MAX;
 		 else
 		 	ids->seq_max = seq_limit;
 	}
diff -Nraup linux-2.6.25-rc6/ipc/util.h linux-2.6.25-rc6_maxshort/ipc/util.h
--- linux-2.6.25-rc6/ipc/util.h	2008-03-24 02:05:25.000000000 +0800
+++ linux-2.6.25-rc6_maxshort/ipc/util.h	2008-03-24 02:07:27.000000000 +0800
@@ -12,7 +12,6 @@
 
 #include <linux/err.h>
 
-#define USHRT_MAX 0xffff
 #define SEQ_MULTIPLIER	(IPCMNI)
 
 void sem_init (void);


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