The patch titled
atmel_serial: use cpu_relax() when busy-waiting
has been removed from the -mm tree. Its filename was
atmel_serial-use-cpu_relax-when-busy-waiting.patch
This patch was dropped because it was merged into mainline or a subsystem tree
The current -mm tree may be found at http://userweb.kernel.org/~akpm/mmotm/
------------------------------------------------------
Subject: atmel_serial: use cpu_relax() when busy-waiting
From: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx>
Replace two instances of barrier() with cpu_relax() since that's the right
thing to do when busy-waiting. This does not actually change anything since
cpu_relax() is defined as barrier() on both ARM and AVR32.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx>
Acked-by: Andrew Victor <linux@xxxxxxxxxxxx>
Tested-by: Marc Pignat <marc.pignat@xxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/serial/atmel_serial.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff -puN drivers/serial/atmel_serial.c~atmel_serial-use-cpu_relax-when-busy-waiting drivers/serial/atmel_serial.c
--- a/drivers/serial/atmel_serial.c~atmel_serial-use-cpu_relax-when-busy-waiting
+++ a/drivers/serial/atmel_serial.c
@@ -615,7 +615,7 @@ static void atmel_set_termios(struct uar
imr = UART_GET_IMR(port);
UART_PUT_IDR(port, -1);
while (!(UART_GET_CSR(port) & ATMEL_US_TXEMPTY))
- barrier();
+ cpu_relax();
/* disable receiver and transmitter */
UART_PUT_CR(port, ATMEL_US_TXDIS | ATMEL_US_RXDIS);
@@ -794,7 +794,7 @@ void __init atmel_register_uart_fns(stru
static void atmel_console_putchar(struct uart_port *port, int ch)
{
while (!(UART_GET_CSR(port) & ATMEL_US_TXRDY))
- barrier();
+ cpu_relax();
UART_PUT_CHAR(port, ch);
}
_
Patches currently in -mm which might be from hskinnemoen@xxxxxxxxx are
origin.patch
git-avr32.patch
-
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