The patch titled
atmel_serial: use cpu_relax() when busy-waiting
has been added to the -mm tree. Its filename is
atmel_serial-use-cpu_relax-when-busy-waiting.patch
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------------------------------------------------------
Subject: atmel_serial: use cpu_relax() when busy-waiting
From: Haavard Skinnemoen <[EMAIL PROTECTED]>
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 <[EMAIL PROTECTED]>
Acked-by: Andrew Victor <[EMAIL PROTECTED]>
Tested-by: Marc Pignat <[EMAIL PROTECTED]>
Signed-off-by: Andrew Morton <[EMAIL PROTECTED]>
---
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
@@ -616,7 +616,7 @@ 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);
@@ -795,7 +795,7 @@ 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 [EMAIL PROTECTED] are
git-avr32.patch
fix-timerfd-breakage-on-avr32-was-re-fix-variable-use-in-avr32-pte_alloc_one.patch
git-mtd.patch
gpiolib-add-drivers-gpio-directory.patch
gpiolib-add-gpio-provider-infrastructure.patch
gpiolib-update-documentation-gpiotxt.patch
gpiolib-pxa-platform-support.patch
gpiolib-pcf857x-i2c-gpio-expander-support.patch
gpiolib-mcp23s08-spi-gpio-expander-support.patch
gpiolib-pca9539-i2c-gpio-expander-support.patch
gpiolib-deprecate-obsolete-pca9539-driver.patch
gpiolib-avr32-at32ap-platform-support.patch
config_highpte-vs-sub-page-page-tables-avr32-fix.patch
read_current_time-cleanups.patch
fix-__const_udelay-declaration-and-definition-mismatches.patch
atmel_spi-throughput-improvement.patch
atmel_spi-chain-dma-transfers.patch
atmel_spi-chain-dma-transfers-update.patch
atmel_spi-fix-dmachain-oops-with-debug-enabled.patch
add-have_oprofile.patch
atmel_lcdfb-validate-display-timings.patch
sanitize-the-type-of-struct-useru_ar0.patch
add-cmpxchg_local-to-avr32.patch
tty-let-architectures-override-the-user-kernel-macros.patch
maintainers-add-haavard-as-maintainer-of-the-atmel_serial-driver.patch
atmel_serial-clean-up-the-code.patch
atmel_serial-use-cpu_relax-when-busy-waiting.patch
atmel_serial-use-existing-console-options-only-if-brg-is-running.patch
atmel_serial-fix-bugs-in-probe-error-path-and-remove.patch
atmel_serial-split-the-interrupt-handler.patch
atmel_serial-add-dma-support.patch
atmel_serial-use-container_of-instead-of-direct-cast.patch
atmel_serial-show-tty-name-in-proc-interrupts.patch
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