From: Roger Pau Monné Date: Mon, 4 Jul 2022 12:48:14 +0000 (+0200) Subject: console/serial: set the default transmit buffer size in Kconfig X-Git-Tag: archive/raspbian/4.17.0-1+rpi1^2~33^2~488 X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=4df2e99d731402da48afb19dc970ccab5a0814d6;p=xen.git console/serial: set the default transmit buffer size in Kconfig Take the opportunity to convert the variable to read-only after init. No functional change intended. Signed-off-by: Roger Pau Monné Reviewed-by: Jan Beulich --- diff --git a/xen/drivers/char/Kconfig b/xen/drivers/char/Kconfig index e5f7b1d8eb..dec58bc993 100644 --- a/xen/drivers/char/Kconfig +++ b/xen/drivers/char/Kconfig @@ -74,3 +74,13 @@ config HAS_EHCI help This selects the USB based EHCI debug port to be used as a UART. If you have an x86 based system with USB, say Y. + +config SERIAL_TX_BUFSIZE + int "Size of the transmit serial buffer" + default 16384 + help + Controls the default size of the transmit buffer (in bytes) used by + the serial driver. Note the value provided will be rounded down to + the nearest power of 2. + + Default value is 16384 (16kiB). diff --git a/xen/drivers/char/serial.c b/xen/drivers/char/serial.c index 5ecba0af33..f6c944bd30 100644 --- a/xen/drivers/char/serial.c +++ b/xen/drivers/char/serial.c @@ -16,7 +16,7 @@ /* Never drop characters, even if the async transmit buffer fills. */ /* #define SERIAL_NEVER_DROP_CHARS 1 */ -unsigned int __read_mostly serial_txbufsz = 16384; +unsigned int __ro_after_init serial_txbufsz = CONFIG_SERIAL_TX_BUFSIZE; size_param("serial_tx_buffer", serial_txbufsz); #define mask_serial_rxbuf_idx(_i) ((_i)&(serial_rxbufsz-1))