* [PATCH] mm/rmap: remove stale hugetlb check in try_to_unmap_one
@ 2026-08-31 8:28 Dev Jain
2026-08-31 8:47 ` Lorenzo Stoakes (ARM)
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Dev Jain @ 2026-08-31 8:28 UTC (permalink / raw)
To: akpm, david, ljs
Cc: Dev Jain, riel, liam, vbabka, harry, jannh, lance.yang, linux-mm,
linux-kernel
Post commit d4ec5572825a ("mm/rmap: add try_to_unmap_poisoned_hugetlb_one")
try_to_unmap_one() cannot be called with a hugetlb folio. Therefore remove
the folio_test_hugetlb() check.
Signed-off-by: Dev Jain <dev.jain@arm.com>
---
Rebase soup - my huge_ptep_get() fixes landed after the refactoring.
This patch applies on Linux 7.3-rc1.
mm/rmap.c | 7 ++-----
1 file changed, 2 insertions(+), 5 deletions(-)
diff --git a/mm/rmap.c b/mm/rmap.c
index d1819fd699380..606c8ecf31302 100644
--- a/mm/rmap.c
+++ b/mm/rmap.c
@@ -2299,11 +2299,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
VM_BUG_ON_FOLIO(!pvmw.pte, folio);
address = pvmw.address;
- if (folio_test_hugetlb(folio)) {
- pteval = huge_ptep_get(mm, address, pvmw.pte);
- } else {
- pteval = ptep_get(pvmw.pte);
- }
+ pteval = ptep_get(pvmw.pte);
+
if (likely(pte_present(pteval))) {
pfn = pte_pfn(pteval);
} else {
--
2.43.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH] mm/rmap: remove stale hugetlb check in try_to_unmap_one
2026-08-31 8:28 [PATCH] mm/rmap: remove stale hugetlb check in try_to_unmap_one Dev Jain
@ 2026-08-31 8:47 ` Lorenzo Stoakes (ARM)
2026-08-31 9:13 ` Lance Yang
2026-08-31 15:59 ` Kunwu Chan
2 siblings, 0 replies; 6+ messages in thread
From: Lorenzo Stoakes (ARM) @ 2026-08-31 8:47 UTC (permalink / raw)
To: Dev Jain
Cc: akpm, david, riel, liam, vbabka, harry, jannh, lance.yang,
linux-mm, linux-kernel
On Mon, Aug 31, 2026 at 08:28:47AM +0000, Dev Jain wrote:
> Post commit d4ec5572825a ("mm/rmap: add try_to_unmap_poisoned_hugetlb_one")
> try_to_unmap_one() cannot be called with a hugetlb folio. Therefore remove
> the folio_test_hugetlb() check.
>
> Signed-off-by: Dev Jain <dev.jain@arm.com>
LGTM so:
Reviewed-by: Lorenzo Stoakes (ARM) <ljs@kernel.org>
> ---
> Rebase soup - my huge_ptep_get() fixes landed after the refactoring.
>
> This patch applies on Linux 7.3-rc1.
>
> mm/rmap.c | 7 ++-----
> 1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/mm/rmap.c b/mm/rmap.c
> index d1819fd699380..606c8ecf31302 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -2299,11 +2299,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
> VM_BUG_ON_FOLIO(!pvmw.pte, folio);
>
> address = pvmw.address;
> - if (folio_test_hugetlb(folio)) {
> - pteval = huge_ptep_get(mm, address, pvmw.pte);
> - } else {
> - pteval = ptep_get(pvmw.pte);
> - }
> + pteval = ptep_get(pvmw.pte);
> +
> if (likely(pte_present(pteval))) {
> pfn = pte_pfn(pteval);
> } else {
> --
> 2.43.0
>
--
Cheers, Lorenzo
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] mm/rmap: remove stale hugetlb check in try_to_unmap_one
2026-08-31 8:28 [PATCH] mm/rmap: remove stale hugetlb check in try_to_unmap_one Dev Jain
2026-08-31 8:47 ` Lorenzo Stoakes (ARM)
@ 2026-08-31 9:13 ` Lance Yang
2026-08-31 15:59 ` Kunwu Chan
2 siblings, 0 replies; 6+ messages in thread
From: Lance Yang @ 2026-08-31 9:13 UTC (permalink / raw)
To: Dev Jain
Cc: riel, liam, ljs, david, vbabka, harry, jannh, linux-mm,
linux-kernel, akpm
On 2026/8/31 16:28, Dev Jain wrote:
> Post commit d4ec5572825a ("mm/rmap: add try_to_unmap_poisoned_hugetlb_one")
> try_to_unmap_one() cannot be called with a hugetlb folio. Therefore remove
> the folio_test_hugetlb() check.
>
> Signed-off-by: Dev Jain <dev.jain@arm.com>
> ---
Reviewed-by: Lance Yang <lance.yang@linux.dev>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] mm/rmap: remove stale hugetlb check in try_to_unmap_one
2026-08-31 8:28 [PATCH] mm/rmap: remove stale hugetlb check in try_to_unmap_one Dev Jain
2026-08-31 8:47 ` Lorenzo Stoakes (ARM)
2026-08-31 9:13 ` Lance Yang
@ 2026-08-31 15:59 ` Kunwu Chan
2026-08-31 16:00 ` Lorenzo Stoakes (ARM)
2 siblings, 1 reply; 6+ messages in thread
From: Kunwu Chan @ 2026-08-31 15:59 UTC (permalink / raw)
To: Dev Jain
Cc: Kunwu Chan, akpm, david, ljs, riel, liam, vbabka, harry, jannh,
lance.yang, linux-mm, linux-kernel, Kunwu Chan
On Mon, 31 Aug 2026 08:28:47 +0000 Dev Jain <dev.jain@arm.com> wrote:
> Post commit d4ec5572825a ("mm/rmap: add try_to_unmap_poisoned_hugetlb_one")
> try_to_unmap_one() cannot be called with a hugetlb folio. Therefore remove
> the folio_test_hugetlb() check.
Yes, the d4ec5572825 change shows that try_to_unmap() dispatches
hugetlb folios to try_to_unmap_poisoned_hugetlb_one(),
so try_to_unmap_one() cannot be called with a hugetlb folio.
It would be better to add:
Fixes: d4ec5572825 ("mm/rmap: add try_to_unmap_poisoned_hugetlb_one")
Reviewed-by: Kunwu Chan <kunwu.chan@gmail.com>
Thanks,
KunWu
>
> Signed-off-by: Dev Jain <dev.jain@arm.com>
> ---
> Rebase soup - my huge_ptep_get() fixes landed after the refactoring.
>
> This patch applies on Linux 7.3-rc1.
>
> mm/rmap.c | 7 ++-----
> 1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/mm/rmap.c b/mm/rmap.c
> index d1819fd699380..606c8ecf31302 100644
> --- a/mm/rmap.c
> +++ b/mm/rmap.c
> @@ -2299,11 +2299,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
> VM_BUG_ON_FOLIO(!pvmw.pte, folio);
>
> address = pvmw.address;
> - if (folio_test_hugetlb(folio)) {
> - pteval = huge_ptep_get(mm, address, pvmw.pte);
> - } else {
> - pteval = ptep_get(pvmw.pte);
> - }
> + pteval = ptep_get(pvmw.pte);
> +
> if (likely(pte_present(pteval))) {
> pfn = pte_pfn(pteval);
> } else {
> --
> 2.43.0
>
>
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] mm/rmap: remove stale hugetlb check in try_to_unmap_one
2026-08-31 15:59 ` Kunwu Chan
@ 2026-08-31 16:00 ` Lorenzo Stoakes (ARM)
2026-08-31 16:41 ` Kunwu Chan
0 siblings, 1 reply; 6+ messages in thread
From: Lorenzo Stoakes (ARM) @ 2026-08-31 16:00 UTC (permalink / raw)
To: Kunwu Chan
Cc: Dev Jain, Kunwu Chan, akpm, david, riel, liam, vbabka, harry,
jannh, lance.yang, linux-mm, linux-kernel
On Mon, Aug 31, 2026 at 11:59:12PM +0800, Kunwu Chan wrote:
> On Mon, 31 Aug 2026 08:28:47 +0000 Dev Jain <dev.jain@arm.com> wrote:
>
> > Post commit d4ec5572825a ("mm/rmap: add try_to_unmap_poisoned_hugetlb_one")
> > try_to_unmap_one() cannot be called with a hugetlb folio. Therefore remove
> > the folio_test_hugetlb() check.
>
> Yes, the d4ec5572825 change shows that try_to_unmap() dispatches
> hugetlb folios to try_to_unmap_poisoned_hugetlb_one(),
> so try_to_unmap_one() cannot be called with a hugetlb folio.
>
>
> It would be better to add:
> Fixes: d4ec5572825 ("mm/rmap: add try_to_unmap_poisoned_hugetlb_one")
Nope, let's not thanks.
This isn't a bug.
>
> Reviewed-by: Kunwu Chan <kunwu.chan@gmail.com>
>
> Thanks,
> KunWu
>
> >
> > Signed-off-by: Dev Jain <dev.jain@arm.com>
> > ---
> > Rebase soup - my huge_ptep_get() fixes landed after the refactoring.
> >
> > This patch applies on Linux 7.3-rc1.
> >
> > mm/rmap.c | 7 ++-----
> > 1 file changed, 2 insertions(+), 5 deletions(-)
> >
> > diff --git a/mm/rmap.c b/mm/rmap.c
> > index d1819fd699380..606c8ecf31302 100644
> > --- a/mm/rmap.c
> > +++ b/mm/rmap.c
> > @@ -2299,11 +2299,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
> > VM_BUG_ON_FOLIO(!pvmw.pte, folio);
> >
> > address = pvmw.address;
> > - if (folio_test_hugetlb(folio)) {
> > - pteval = huge_ptep_get(mm, address, pvmw.pte);
> > - } else {
> > - pteval = ptep_get(pvmw.pte);
> > - }
> > + pteval = ptep_get(pvmw.pte);
> > +
> > if (likely(pte_present(pteval))) {
> > pfn = pte_pfn(pteval);
> > } else {
> > --
> > 2.43.0
> >
> >
>
--
Cheers, Lorenzo
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH] mm/rmap: remove stale hugetlb check in try_to_unmap_one
2026-08-31 16:00 ` Lorenzo Stoakes (ARM)
@ 2026-08-31 16:41 ` Kunwu Chan
0 siblings, 0 replies; 6+ messages in thread
From: Kunwu Chan @ 2026-08-31 16:41 UTC (permalink / raw)
To: Lorenzo Stoakes (ARM)
Cc: Kunwu Chan, Kunwu Chan, Dev Jain, akpm, david, riel, liam, vbabka,
harry, jannh, lance.yang, linux-mm, linux-kernel
On Mon, 31 Aug 2026 17:00:56 +0100 "Lorenzo Stoakes (ARM)" <ljs@kernel.org> wrote:
> On Mon, Aug 31, 2026 at 11:59:12PM +0800, Kunwu Chan wrote:
> > On Mon, 31 Aug 2026 08:28:47 +0000 Dev Jain <dev.jain@arm.com> wrote:
> >
> > > Post commit d4ec5572825a ("mm/rmap: add try_to_unmap_poisoned_hugetlb_one")
> > > try_to_unmap_one() cannot be called with a hugetlb folio. Therefore remove
> > > the folio_test_hugetlb() check.
> >
> > Yes, the d4ec5572825 change shows that try_to_unmap() dispatches
> > hugetlb folios to try_to_unmap_poisoned_hugetlb_one(),
> > so try_to_unmap_one() cannot be called with a hugetlb folio.
> >
> >
> > It would be better to add:
> > Fixes: d4ec5572825 ("mm/rmap: add try_to_unmap_poisoned_hugetlb_one")
>
> Nope, let's not thanks.
>
> This isn't a bug.
>
Got it, thanks for pointing that out.
I mistakenly treated the stale code as a bug.
Thanks,
KunWu
> >
> > Reviewed-by: Kunwu Chan <kunwu.chan@gmail.com>
> >
> > Thanks,
> > KunWu
> >
> > >
> > > Signed-off-by: Dev Jain <dev.jain@arm.com>
> > > ---
> > > Rebase soup - my huge_ptep_get() fixes landed after the refactoring.
> > >
> > > This patch applies on Linux 7.3-rc1.
> > >
> > > mm/rmap.c | 7 ++-----
> > > 1 file changed, 2 insertions(+), 5 deletions(-)
> > >
> > > diff --git a/mm/rmap.c b/mm/rmap.c
> > > index d1819fd699380..606c8ecf31302 100644
> > > --- a/mm/rmap.c
> > > +++ b/mm/rmap.c
> > > @@ -2299,11 +2299,8 @@ static bool try_to_unmap_one(struct folio *folio, struct vm_area_struct *vma,
> > > VM_BUG_ON_FOLIO(!pvmw.pte, folio);
> > >
> > > address = pvmw.address;
> > > - if (folio_test_hugetlb(folio)) {
> > > - pteval = huge_ptep_get(mm, address, pvmw.pte);
> > > - } else {
> > > - pteval = ptep_get(pvmw.pte);
> > > - }
> > > + pteval = ptep_get(pvmw.pte);
> > > +
> > > if (likely(pte_present(pteval))) {
> > > pfn = pte_pfn(pteval);
> > > } else {
> > > --
> > > 2.43.0
> > >
> > >
> >
>
> --
> Cheers, Lorenzo
>
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2026-08-31 16:42 UTC | newest]
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2026-08-31 8:28 [PATCH] mm/rmap: remove stale hugetlb check in try_to_unmap_one Dev Jain
2026-08-31 8:47 ` Lorenzo Stoakes (ARM)
2026-08-31 9:13 ` Lance Yang
2026-08-31 15:59 ` Kunwu Chan
2026-08-31 16:00 ` Lorenzo Stoakes (ARM)
2026-08-31 16:41 ` Kunwu Chan
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