I fixed m32r_sio.c to use cpu_relax().
Thanks.
From: Andrew Morton <[email protected]>
Subject: Re: [PATCH 2.6.12-rc5] m32r: Support M3A-2170(Mappi-III) platform
Date: Tue, 31 May 2005 14:01:51 -0700
> Hirokazu Takata <[email protected]> wrote:
> >
> > This patchset is for supporting a new m32r platform,
> > M3A-2170(Mappi-III) evaluation board.
> > An M32R chip multiprocessor is equipped on the board.
> > http://http://www.linux-m32r.org/eng/platform/platform.html
> >
> > ...
> > static void putc(char c)
> > {
> > -
> > while ((*BOOT_SIO0STS & 0x3) != 0x3) ;
>
> cpu_relax()?
>
> > static void putc(char c)
> > {
> > -
> > while ((*SIO0STS & 0x1) == 0) ;
>
> cpu_relax()?
>
Signed-off-by: Hirokazu Takata <[email protected]>
---
arch/m32r/boot/compressed/m32r_sio.c | 13 +++++++++----
1 files changed, 9 insertions(+), 4 deletions(-)
diff -ruNp a/arch/m32r/boot/compressed/m32r_sio.c b/arch/m32r/boot/compressed/m32r_sio.c
--- a/arch/m32r/boot/compressed/m32r_sio.c 2005-06-02 12:09:19.000000000 +0900
+++ b/arch/m32r/boot/compressed/m32r_sio.c 2005-06-02 18:16:54.000000000 +0900
@@ -6,6 +6,7 @@
*/
#include <linux/config.h>
+#include <asm/processor.h>
static void putc(char c);
@@ -38,10 +39,12 @@ static int puts(const char *s)
static void putc(char c)
{
- while ((*BOOT_SIO0STS & 0x3) != 0x3) ;
+ while ((*BOOT_SIO0STS & 0x3) != 0x3)
+ cpu_relax();
if (c == '\n') {
*BOOT_SIO0TXB = '\r';
- while ((*BOOT_SIO0STS & 0x3) != 0x3) ;
+ while ((*BOOT_SIO0STS & 0x3) != 0x3)
+ cpu_relax();
}
*BOOT_SIO0TXB = c;
}
@@ -56,10 +59,12 @@ static void putc(char c)
static void putc(char c)
{
- while ((*SIO0STS & 0x1) == 0) ;
+ while ((*SIO0STS & 0x1) == 0)
+ cpu_relax();
if (c == '\n') {
*SIO0TXB = '\r';
- while ((*SIO0STS & 0x1) == 0) ;
+ while ((*SIO0STS & 0x1) == 0)
+ cpu_relax();
}
*SIO0TXB = c;
}
--
Hirokazu Takata <[email protected]>
Linux/M32R Project: http://www.linux-m32r.org/
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