Re: [PATCH v3 2/3] liveupdate: kho: Increase metadata bitmap size to PAGE_SIZE

On Mon, Oct 20, 2025 at 5:09 PM Pasha Tatashin pasha.tatashin@soleen.com wrote:

KHO memory preservation metadata is preserved in 512 byte chunks which requires their allocation from slab allocator. Slabs are not safe to be used with KHO because of kfence, and because partial slabs may lead leaks to the next kernel. Change the size to be PAGE_SIZE.

-#define PRESERVE_BITS (512 * 8) +#define PRESERVE_BITS (PAGE_SIZE * 8)

nit: A comment somewhere (maybe here?) about the requirement that KHO metadata are not stored on slabs would be helpful to avoid someone "optimizing" this back to 512 in the future.