[Xen-changelog] [xen-unstable] serial: don't waste space allocated for the tx buffer(s)

[Xen patchbot-unstable <patchbot@xxxxxxx>]

# HG changeset patch
# User Jan Beulich <jbeulich@xxxxxxxx>
# Date 1343375840 -7200
# Node ID 3298156d6cfa9bfe3db5a7c8f175a753c62550d4
# Parent  131148d57fa2a4c6dfe96c73e527ef9e028b6e90
serial: don't waste space allocated for the tx buffer(s)

We're allocating minimally a full page, so no reason to not also use
all that space.

Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
Acked-by: Keir Fraser <keir@xxxxxxx>
---


diff -r 131148d57fa2 -r 3298156d6cfa xen/drivers/char/serial.c
--- a/xen/drivers/char/serial.c Thu Jul 26 19:02:44 2012 +0100
+++ b/xen/drivers/char/serial.c Fri Jul 27 09:57:20 2012 +0200
@@ -483,8 +483,8 @@ void __init serial_async_transmit(struct
     BUG_ON(!port->driver->tx_empty);
     if ( port->txbuf != NULL )
         return;
-    if ( serial_txbufsz < 512 )
-        serial_txbufsz = 512;
+    if ( serial_txbufsz < PAGE_SIZE )
+        serial_txbufsz = PAGE_SIZE;
     while ( serial_txbufsz & (serial_txbufsz - 1) )
         serial_txbufsz &= serial_txbufsz - 1;
     port->txbuf = alloc_xenheap_pages(

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