When using alloc_pages(GFP_KERNEL | __GFP_COMP), is it ensured that a single TLB entry is allocated in the kernel driver for hugepages?

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No, using the allocpages(GFPKERNEL | _GFPCOMP) function does not guarantee that a single TLB entry is allocated in the kernel driver for hugepages. This function only requests a contiguous block of memory pages with the specified flags. Whether or not this block of pages will be mapped to a single TLB entry depends on the specific implementation and configuration of the page tables and TLB in the system. For example, if the system has a large page size, the kernel may choose to map the block of pages to a single TLB entry. However, if the system has a small page size, the kernel may choose to map each individual page to a separate TLB entry.