Re: [PATCH v4] arm64: mm: Populate vmemmap/linear at the page level for hotplugged sections

[Catalin Marinas]

On Thu, Jan 09, 2025 at 03:04:48PM +0800, Zhenhua Huang wrote:
> On 2025/1/8 18:11, Anshuman Khandual wrote:
> > Just wondering why not start with PUD level itself ? Although SUBSECTION_SHIFT
> > might never reach the PUD level but this will help keep the flags calculations
> > bit simple and ready for all future changes.
> > 
> 
> I suppose that it's because these are significantly larger than 2M, whereas
> Catalin assumed SUBSECTION_SIZE would not increase?
> His comment:
> "should cover any changes to SUBSECTION_SHIFT making it *smaller* than 2MB.
> "

Yeah, I was thinking of having fewer code lines. Otherwise the compiler
would likely optimise them anyway to a single assignment.

-- 
Catalin