This is a note to let you know that I've just added the patch titled alpha: Declare virt_to_phys and virt_to_bus parameter as pointer to volatile to the 5.14-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: alpha-declare-virt_to_phys-and-virt_to_bus-parameter.patch and it can be found in the queue-5.14 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let <stable@xxxxxxxxxxxxxxx> know about it. commit c8a6d42c9ad510eade894b2a1f1553a3b62b2ac1 Author: Guenter Roeck <linux@xxxxxxxxxxxx> Date: Wed Sep 8 22:00:33 2021 -0700 alpha: Declare virt_to_phys and virt_to_bus parameter as pointer to volatile [ Upstream commit 35a3f4ef0ab543daa1725b0c963eb8c05e3376f8 ] Some drivers pass a pointer to volatile data to virt_to_bus() and virt_to_phys(), and that works fine. One exception is alpha. This results in a number of compile errors such as drivers/net/wan/lmc/lmc_main.c: In function 'lmc_softreset': drivers/net/wan/lmc/lmc_main.c:1782:50: error: passing argument 1 of 'virt_to_bus' discards 'volatile' qualifier from pointer target type drivers/atm/ambassador.c: In function 'do_loader_command': drivers/atm/ambassador.c:1747:58: error: passing argument 1 of 'virt_to_bus' discards 'volatile' qualifier from pointer target type Declare the parameter of virt_to_phys and virt_to_bus as pointer to volatile to fix the problem. Signed-off-by: Guenter Roeck <linux@xxxxxxxxxxxx> Acked-by: Arnd Bergmann <arnd@xxxxxxxx> Signed-off-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> diff --git a/arch/alpha/include/asm/io.h b/arch/alpha/include/asm/io.h index 0fab5ac90775..c9cb554fbe54 100644 --- a/arch/alpha/include/asm/io.h +++ b/arch/alpha/include/asm/io.h @@ -60,7 +60,7 @@ extern inline void set_hae(unsigned long new_hae) * Change virtual addresses to physical addresses and vv. */ #ifdef USE_48_BIT_KSEG -static inline unsigned long virt_to_phys(void *address) +static inline unsigned long virt_to_phys(volatile void *address) { return (unsigned long)address - IDENT_ADDR; } @@ -70,7 +70,7 @@ static inline void * phys_to_virt(unsigned long address) return (void *) (address + IDENT_ADDR); } #else -static inline unsigned long virt_to_phys(void *address) +static inline unsigned long virt_to_phys(volatile void *address) { unsigned long phys = (unsigned long)address; @@ -106,7 +106,7 @@ static inline void * phys_to_virt(unsigned long address) extern unsigned long __direct_map_base; extern unsigned long __direct_map_size; -static inline unsigned long __deprecated virt_to_bus(void *address) +static inline unsigned long __deprecated virt_to_bus(volatile void *address) { unsigned long phys = virt_to_phys(address); unsigned long bus = phys + __direct_map_base;