[PATCH] arm64: raise default ARCH_MMAP_RND_BITS for 48-bit and 52-bit VA

[Iurii Trukhin]

On Thu, Oct 15, 2026 at 10:25:49AM +0530, Anshuman Khandual wrote:
> ARCH_MMAP_RND_BITS_MIN still gets used when VA_BITS != 48 or 52. But this seems
> like a subtle detail. Just wondering - should a comment explaining this default
> random bits fallback sequence be added here as well ?

Agreed, since arch/Kconfig includes arch/$(SRCARCH)/Kconfig before
defining the generic config ARCH_MMAP_RND_BITS entry, the fallback to
default ARCH_MMAP_RND_BITS_MIN in arch/Kconfig is not obvious when
reading arch/arm64/Kconfig on its own.

I will send a v2 adding a comment right above config ARCH_MMAP_RND_BITS
to make that fallback sequence explicit.

Thanks,
Iurii