Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx> writes:
> Hi Andrew,
>
> After merging the akpm-current tree, today's linux-next build (powerpc
> allyesconfig and pseries_le_defconfig) failed like this:
>
> In file included from include/linux/mm.h:394:0,
> from mm/huge_memory.c:10:
> include/linux/huge_mm.h:53:22: error: initializer element is not constant
> #define HPAGE_PMD_NR (1<<HPAGE_PMD_ORDER)
> ^
> mm/huge_memory.c:104:62: note: in expansion of macro 'HPAGE_PMD_NR'
> static unsigned int khugepaged_max_ptes_swap __read_mostly = HPAGE_PMD_NR/8;
> ^
>
> Caused by commit
>
> 6d34b9749be2 ("mm: make optimistic check for swapin readahead")
>
> interacting with commit
>
> dd1842a2a448 ("powerpc/mm: Make page table size a variable")
>
> from the powerpc tree.
>
> I applied this fix patch for today (hopefully this is still initialised
> early enough):
>
> From: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
> Date: Mon, 2 May 2016 18:25:42 +1000
> Subject: [PATCH] mm: make optimistic check for swapin readahead fix
>
> Signed-off-by: Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>
Reviewed-by: Aneesh Kumar K.V <aneesh.kumar@xxxxxxxxxxxxxxxxxx>
> ---
> mm/huge_memory.c | 3 ++-
> 1 file changed, 2 insertions(+), 1 deletion(-)
>
> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
> index f0cd9dbc1157..6aabfa166b6d 100644
> --- a/mm/huge_memory.c
> +++ b/mm/huge_memory.c
> @@ -101,7 +101,7 @@ static DECLARE_WAIT_QUEUE_HEAD(khugepaged_wait);
> * fault.
> */
> static unsigned int khugepaged_max_ptes_none __read_mostly;
> -static unsigned int khugepaged_max_ptes_swap __read_mostly = HPAGE_PMD_NR/8;
> +static unsigned int khugepaged_max_ptes_swap __read_mostly;
> static unsigned long allocstall;
>
> static int khugepaged(void *none);
> @@ -703,6 +703,7 @@ static int __init hugepage_init(void)
>
> khugepaged_pages_to_scan = HPAGE_PMD_NR * 8;
> khugepaged_max_ptes_none = HPAGE_PMD_NR - 1;
> + khugepaged_max_ptes_swap = HPAGE_PMD_NR / 8;
> /*
> * hugepages can't be allocated by the buddy allocator
> */
> --
> 2.7.0
>
>
>
>
> --
> Cheers,
> Stephen Rothwell
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