[PATCH v2 5/9] arm64: mm: move vmemmap region right below the linear region
From: catalin.marinas@arm.com (Catalin Marinas)
Date: 2016-03-01 15:40:09
Also in:
linux-mm
On Mon, Feb 29, 2016 at 03:44:40PM +0100, Ard Biesheuvel wrote:
quoted hunk ↗ jump to hunk
@@ -404,6 +404,12 @@ void __init mem_init(void) BUILD_BUG_ON(TASK_SIZE_32 > TASK_SIZE_64); #endif + /* + * Make sure we chose the upper bound of sizeof(struct page) + * correctly. + */ + BUILD_BUG_ON(sizeof(struct page) > (1 << STRUCT_PAGE_MAX_SHIFT));
Since with the vmemmap fix you already assume that PAGE_OFFSET is half of the VA space, we should add another check on PAGE_OFFSET != UL(0xffffffffffffffff) << (VA_BITS - 1), just in case someone thinks they could map a bit of extra RAM without going for a larger VA. -- Catalin