Re: [V2] powerpc/Kconfig: Update config option based on page size.
From: Aneesh Kumar K.V <hidden>
Date: 2016-04-19 14:59:43
Michael Ellerman [off-list ref] writes:
On Fri, 2016-19-02 at 05:38:47 UTC, Rashmica Gupta wrote:quoted
Currently on PPC64 changing kernel pagesize from 4K to 64K leaves FORCE_MAX_ZONEORDER set to 13 - which produces a compile error....quoted
So, update the range of FORCE_MAX_ZONEORDER from 9-64 to 8-9 for 64K pages and from 13-64 to 9-13 for 4K pages. Signed-off-by: Rashmica Gupta <redacted> Reviewed-by: Balbir Singh <bsingharora@gmail.com>Applied to powerpc next, thanks. https://git.kernel.org/powerpc/c/a7ee539584acf4a565b7439cea
HPAGE_PMD_ORDER is not something we should check w.r.t 4k linux page
size. We do have the below constraint w.r.t hugetlb pages
static inline bool hstate_is_gigantic(struct hstate *h)
{
return huge_page_order(h) >= MAX_ORDER;
}
That require MAX_ORDER to be greater than 12.
Did we test hugetlbfs 4k config with this patch ? Will it work if we
start marking hugepage as gigantic page ?
-aneesh