| Message ID | a17b96d1be5341c11f263e1e45c9de1cb754e416.1719172843.git.christophe.jaillet@wanadoo.fr (mailing list archive) |
|---|---|
| State | Awaiting Upstream |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [net-next] can: m_can: Constify struct m_can_ops | expand |
On 23.06.2024 22:01:50, Christophe JAILLET wrote: > 'struct m_can_ops' is not modified in these drivers. > > Constifying this structure moves some data to a read-only section, so > increase overall security. > > On a x86_64, with allmodconfig, as an example: > Before: > ====== > text data bss dec hex filename > 4806 520 0 5326 14ce drivers/net/can/m_can/m_can_pci.o > > After: > ===== > text data bss dec hex filename > 4862 464 0 5326 14ce drivers/net/can/m_can/m_can_pci.o > > Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> Applied to linuc-can-next. Thanks, Marc
diff --git a/drivers/net/can/m_can/m_can.h b/drivers/net/can/m_can/m_can.h index 3a9edc292593..92b2bd8628e6 100644 --- a/drivers/net/can/m_can/m_can.h +++ b/drivers/net/can/m_can/m_can.h @@ -91,7 +91,7 @@ struct m_can_classdev { ktime_t irq_timer_wait; - struct m_can_ops *ops; + const struct m_can_ops *ops; int version; u32 irqstatus; diff --git a/drivers/net/can/m_can/m_can_pci.c b/drivers/net/can/m_can/m_can_pci.c index 45400de4163d..d72fe771dfc7 100644 --- a/drivers/net/can/m_can/m_can_pci.c +++ b/drivers/net/can/m_can/m_can_pci.c @@ -77,7 +77,7 @@ static int iomap_write_fifo(struct m_can_classdev *cdev, int offset, return 0; } -static struct m_can_ops m_can_pci_ops = { +static const struct m_can_ops m_can_pci_ops = { .read_reg = iomap_read_reg, .write_reg = iomap_write_reg, .write_fifo = iomap_write_fifo, diff --git a/drivers/net/can/m_can/m_can_platform.c b/drivers/net/can/m_can/m_can_platform.c index df0367124b4c..983ab80260dd 100644 --- a/drivers/net/can/m_can/m_can_platform.c +++ b/drivers/net/can/m_can/m_can_platform.c @@ -68,7 +68,7 @@ static int iomap_write_fifo(struct m_can_classdev *cdev, int offset, return 0; } -static struct m_can_ops m_can_plat_ops = { +static const struct m_can_ops m_can_plat_ops = { .read_reg = iomap_read_reg, .write_reg = iomap_write_reg, .write_fifo = iomap_write_fifo, diff --git a/drivers/net/can/m_can/tcan4x5x-core.c b/drivers/net/can/m_can/tcan4x5x-core.c index a42600dac70d..f15619d31065 100644 --- a/drivers/net/can/m_can/tcan4x5x-core.c +++ b/drivers/net/can/m_can/tcan4x5x-core.c @@ -357,7 +357,7 @@ static int tcan4x5x_get_gpios(struct m_can_classdev *cdev, return 0; } -static struct m_can_ops tcan4x5x_ops = { +static const struct m_can_ops tcan4x5x_ops = { .init = tcan4x5x_init, .read_reg = tcan4x5x_read_reg, .write_reg = tcan4x5x_write_reg,
'struct m_can_ops' is not modified in these drivers. Constifying this structure moves some data to a read-only section, so increase overall security. On a x86_64, with allmodconfig, as an example: Before: ====== text data bss dec hex filename 4806 520 0 5326 14ce drivers/net/can/m_can/m_can_pci.o After: ===== text data bss dec hex filename 4862 464 0 5326 14ce drivers/net/can/m_can/m_can_pci.o Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr> --- Compile tested-only --- drivers/net/can/m_can/m_can.h | 2 +- drivers/net/can/m_can/m_can_pci.c | 2 +- drivers/net/can/m_can/m_can_platform.c | 2 +- drivers/net/can/m_can/tcan4x5x-core.c | 2 +- 4 files changed, 4 insertions(+), 4 deletions(-)