diff options
| author | Rasmus Villemoes <ravi@prevas.dk> | 2024-10-03 16:10:28 +0200 |
|---|---|---|
| committer | Tom Rini <trini@konsulko.com> | 2024-10-16 15:54:31 -0600 |
| commit | 32822982307d3f4288580fe2f3b25e5031900702 (patch) | |
| tree | f6e1688111381dcbc6175a4266e18ea85f197616 /drivers/serial/serial-uclass.c | |
| parent | f4e7a399480c453df055b521ceda4c57ffb8e99e (diff) | |
serial: add build-time sanity check of CONFIG_SERIAL_RX_BUFFER_SIZE
The help text says it must be a power of 2, and the implementation
does rely on that. Enforce it.
A violation gives a wall of text, but the last few lines should be
reasonably obvious:
drivers/serial/serial-uclass.c:334:9: note: in expansion of macro ‘BUILD_BUG_ON_NOT_POWER_OF_2’
334 | BUILD_BUG_ON_NOT_POWER_OF_2(CONFIG_SERIAL_RX_BUFFER_SIZE);
Signed-off-by: Rasmus Villemoes <ravi@prevas.dk>
Reviewed-by: Simon Glass <sjg@chromium.org>
Diffstat (limited to 'drivers/serial/serial-uclass.c')
| -rw-r--r-- | drivers/serial/serial-uclass.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/serial/serial-uclass.c b/drivers/serial/serial-uclass.c index 28d7a202afc..484f0f7d3e8 100644 --- a/drivers/serial/serial-uclass.c +++ b/drivers/serial/serial-uclass.c @@ -18,6 +18,7 @@ #include <dm/lists.h> #include <dm/device-internal.h> #include <dm/of_access.h> +#include <linux/build_bug.h> #include <linux/delay.h> DECLARE_GLOBAL_DATA_PTR; @@ -330,6 +331,8 @@ static int _serial_tstc(struct udevice *dev) struct serial_dev_priv *upriv = dev_get_uclass_priv(dev); uint wr, avail; + BUILD_BUG_ON_NOT_POWER_OF_2(CONFIG_SERIAL_RX_BUFFER_SIZE); + /* Read all available chars into the RX buffer while there's room */ avail = CONFIG_SERIAL_RX_BUFFER_SIZE - (upriv->wr_ptr - upriv->rd_ptr); while (avail-- && __serial_tstc(dev)) { |