* Re: [PATCH 1/1] mm/hugetlb: Set PTE as huge in hugetlb_change_protection
[not found] ` <BAB94DBB0E89D8409949BC28AC95914C47B12789@USMAExch1.tad.internal.tilera.com>
@ 2013-01-22 10:21 ` Michal Hocko
2013-01-22 13:50 ` Hillf Danton
1 sibling, 0 replies; 3+ messages in thread
From: Michal Hocko @ 2013-01-22 10:21 UTC (permalink / raw)
To: Tony Lu
Cc: linux-kernel, linux-mm, Andrew Morton, Aneesh Kumar K.V,
Hillf Danton, KAMEZAWA Hiroyuki, Chris Metcalf
On Tue 22-01-13 02:37:15, Tony Lu wrote:
> >-----Original Message-----
> >From: Michal Hocko [mailto:mhocko@suse.cz]
> >Sent: Monday, January 21, 2013 6:04 PM
> >To: Tony Lu
> >Cc: linux-kernel@vger.kernel.org; linux-mm@kvack.org; Andrew Morton; Aneesh
> >Kumar K.V; Hillf Danton; KAMEZAWA Hiroyuki; Chris Metcalf
> >Subject: Re: [PATCH 1/1] mm/hugetlb: Set PTE as huge in
> >hugetlb_change_protection
> >
> >On Mon 21-01-13 04:13:07, Tony Lu wrote:
> >> From da8432aafd231e7cdcda9d15484829def4663cb0 Mon Sep 17 00:00:00 2001
> >> From: Zhigang Lu <zlu@tilera.com>
> >> Date: Mon, 21 Jan 2013 11:23:26 +0800
> >> Subject: [PATCH 1/1] mm/hugetlb: Set PTE as huge in hugetlb_change_protection
> >>
> >> When setting a huge PTE, besides calling pte_mkhuge(), we also need
> >> to call arch_make_huge_pte(), which we indeed do in make_huge_pte(),
> >> but we forget to do in hugetlb_change_protection().
> >
> >I guess you also need it in remove_migration_pte. This calls for a
> >helper which would do both pte_mkhuge() and arch_make_huge_pte.
> >
> >Besides that, tile seem to be the only arch which implements this arch
> >hook (introduced by 621b1955 in 3.5) so this should be considered for
> >stable.
>
> Thank you. Yes, remove_migration_pte also needs it. Here is the updated patch.
>
> From 44045d672aa72eb2e76be89f95ab720952b4b09c Mon Sep 17 00:00:00 2001
> From: Zhigang Lu <zlu@tilera.com>
> Date: Tue, 22 Jan 2013 09:58:58 +0800
> Subject: [PATCH 1/1] mm/hugetlb: Set PTE as huge in hugetlb_change_protection
> and remove_migration_pte
>
> When setting a huge PTE, besides calling pte_mkhuge(), we also need
> to call arch_make_huge_pte(), which we indeed do in make_huge_pte(),
> but we forget to do in hugetlb_change_protection() and
> remove_migration_pte().
>
> Signed-off-by: Zhigang Lu <zlu@tilera.com>
> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
Reviewed-by: Michal Hocko <mhocko@suse.cz>
> ---
> mm/hugetlb.c | 1 +
> mm/migrate.c | 4 +++-
> 2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 4f3ea0b..546db81 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3033,6 +3033,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
> if (!huge_pte_none(huge_ptep_get(ptep))) {
> pte = huge_ptep_get_and_clear(mm, address, ptep);
> pte = pte_mkhuge(pte_modify(pte, newprot));
> + pte = arch_make_huge_pte(pte, vma, NULL, 0);
> set_huge_pte_at(mm, address, ptep, pte);
> pages++;
> }
> diff --git a/mm/migrate.c b/mm/migrate.c
> index c387786..2fd8b4a 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -160,8 +160,10 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
> if (is_write_migration_entry(entry))
> pte = pte_mkwrite(pte);
> #ifdef CONFIG_HUGETLB_PAGE
> - if (PageHuge(new))
> + if (PageHuge(new)) {
> pte = pte_mkhuge(pte);
> + pte = arch_make_huge_pte(pte, vma, new, 0);
> + }
> #endif
> flush_cache_page(vma, addr, pte_pfn(pte));
> set_pte_at(mm, addr, ptep, pte);
> --
> 1.7.10.3
--
Michal Hocko
SUSE Labs
^ permalink raw reply [flat|nested] 3+ messages in thread* Re: [PATCH 1/1] mm/hugetlb: Set PTE as huge in hugetlb_change_protection
[not found] ` <BAB94DBB0E89D8409949BC28AC95914C47B12789@USMAExch1.tad.internal.tilera.com>
2013-01-22 10:21 ` Michal Hocko
@ 2013-01-22 13:50 ` Hillf Danton
1 sibling, 0 replies; 3+ messages in thread
From: Hillf Danton @ 2013-01-22 13:50 UTC (permalink / raw)
To: Tony Lu
Cc: Michal Hocko, linux-kernel, linux-mm, Andrew Morton,
Aneesh Kumar K.V, KAMEZAWA Hiroyuki, Chris Metcalf
On Tue, Jan 22, 2013 at 10:37 AM, Tony Lu <zlu@tilera.com> wrote:
> From 44045d672aa72eb2e76be89f95ab720952b4b09c Mon Sep 17 00:00:00 2001
> From: Zhigang Lu <zlu@tilera.com>
> Date: Tue, 22 Jan 2013 09:58:58 +0800
> Subject: [PATCH 1/1] mm/hugetlb: Set PTE as huge in hugetlb_change_protection
> and remove_migration_pte
>
> When setting a huge PTE, besides calling pte_mkhuge(), we also need
> to call arch_make_huge_pte(), which we indeed do in make_huge_pte(),
> but we forget to do in hugetlb_change_protection() and
> remove_migration_pte().
>
> Signed-off-by: Zhigang Lu <zlu@tilera.com>
> Signed-off-by: Chris Metcalf <cmetcalf@tilera.com>
> ---
Acked-by: Hillf Danton <dhillf@gmail.com>
> mm/hugetlb.c | 1 +
> mm/migrate.c | 4 +++-
> 2 files changed, 4 insertions(+), 1 deletion(-)
>
> diff --git a/mm/hugetlb.c b/mm/hugetlb.c
> index 4f3ea0b..546db81 100644
> --- a/mm/hugetlb.c
> +++ b/mm/hugetlb.c
> @@ -3033,6 +3033,7 @@ unsigned long hugetlb_change_protection(struct vm_area_struct *vma,
> if (!huge_pte_none(huge_ptep_get(ptep))) {
> pte = huge_ptep_get_and_clear(mm, address, ptep);
> pte = pte_mkhuge(pte_modify(pte, newprot));
> + pte = arch_make_huge_pte(pte, vma, NULL, 0);
> set_huge_pte_at(mm, address, ptep, pte);
> pages++;
> }
> diff --git a/mm/migrate.c b/mm/migrate.c
> index c387786..2fd8b4a 100644
> --- a/mm/migrate.c
> +++ b/mm/migrate.c
> @@ -160,8 +160,10 @@ static int remove_migration_pte(struct page *new, struct vm_area_struct *vma,
> if (is_write_migration_entry(entry))
> pte = pte_mkwrite(pte);
> #ifdef CONFIG_HUGETLB_PAGE
> - if (PageHuge(new))
> + if (PageHuge(new)) {
> pte = pte_mkhuge(pte);
> + pte = arch_make_huge_pte(pte, vma, new, 0);
> + }
> #endif
> flush_cache_page(vma, addr, pte_pfn(pte));
> set_pte_at(mm, addr, ptep, pte);
> --
> 1.7.10.3
^ permalink raw reply [flat|nested] 3+ messages in thread