Take the opportunity to convert the variable to read-only after init.
No functional change intended.
Signed-off-by: Roger Pau Monné <roger....@citrix.com>
---
xen/drivers/char/Kconfig | 10 ++++++++++
xen/drivers/char/serial.c | 3 ++-
2 files changed, 12 insertions(+), 1 deletion(-)
diff --git a/xen/drivers/char/Kconfig b/xen/drivers/char/Kconfig
index e5f7b1d8eb..a349d55f18 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 rounder up to
+ PAGE_SIZE.
+
+ Default value is 16384 (16KB).
diff --git a/xen/drivers/char/serial.c b/xen/drivers/char/serial.c
index 5ecba0af33..8d375a41e3 100644
--- a/xen/drivers/char/serial.c
+++ b/xen/drivers/char/serial.c
@@ -16,7 +16,8 @@
/* 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 = ROUNDUP(CONFIG_SERIAL_TX_BUFSIZE,
+ PAGE_SIZE);
size_param("serial_tx_buffer", serial_txbufsz);
#define mask_serial_rxbuf_idx(_i) ((_i)&(serial_rxbufsz-1))
--
2.36.1
