[PATCH] ARM: keystone: fix integer overflow warning

[Santosh Shilimkar]

> On Mar 23, 2021, at 6:18 AM, Arnd Bergmann <arnd at kernel.org> wrote:
> 
> From: Arnd Bergmann <arnd at arndb.de>
> 
> clang warns about an impossible condition when building with 32-bit
> phys_addr_t:
> 
> arch/arm/mach-keystone/keystone.c:79:16: error: result of comparison of constant 51539607551 with expression of type 'phys_addr_t' (aka 'unsigned int') is always false [-Werror,-Wtautological-constant-out-of-range-compare]
>            mem_end   > KEYSTONE_HIGH_PHYS_END) {
>            ~~~~~~~   ^ ~~~~~~~~~~~~~~~~~~~~~~
> arch/arm/mach-keystone/keystone.c:78:16: error: result of comparison of constant 34359738368 with expression of type 'phys_addr_t' (aka 'unsigned int') is always true [-Werror,-Wtautological-constant-out-of-range-compare]
>        if (mem_start < KEYSTONE_HIGH_PHYS_START ||
>            ~~~~~~~~~ ^ ~~~~~~~~~~~~~~~~~~~~~~~~
> 
> Change the temporary variable to a fixed-size u64 to avoid the warning.
> 
> Signed-off-by: Arnd Bergmann <arnd at arndb.de>
> —

Looks fine to me.

Acked-by: Santosh Shilimkar <ssantosh at kernel.org>