Re: [PATCH v2 2/7] selftests/mm: Add support to test 4PB VA on PPC64

On 03/07/25 11:36 am, Aboorva Devarajan wrote:

From: Donet Tom donettom@linux.ibm.com

PowerPC64 supports a 4PB virtual address space, but this test was previously limited to 512TB. This patch extends the coverage up to the full 4PB VA range on PowerPC64.

Memory from 0 to 128TB is allocated without an address hint, while allocations from 128TB to 4PB use a hint address.

Signed-off-by: Donet Tom donettom@linux.ibm.com Signed-off-by: Aboorva Devarajan aboorvad@linux.ibm.com

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Would have saved us a lot of time if we had figured out that the problem wasn't the gap logic but the large VA space support, anyhow digging down that rabbit hole gave me some knowledge on VMA allocation stuff : )

Reviewed-by: Dev Jain dev.jain@arm.com