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SubjectRe: [PATCH 03/16] mm/huge_memory: fix comment of __pud_trans_huge_lock
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On 2022/6/25 2:56, Matthew Wilcox wrote:
> On Thu, Jun 23, 2022 at 01:06:14AM +0800, Miaohe Lin wrote:
>> __pud_trans_huge_lock returns page table lock pointer if a given pud maps
>> a thp instead of 'true' since introduced. Fix corresponding comments.
>
> I think the comments here are rather wasted. I think this comment
> should be moved to pud_trans_huge_lock() and turned into kernel-doc
> format.

Do you mean something like below? If so, __pmd_trans_huge_lock might need to do the
similar work?

diff --git a/include/linux/huge_mm.h b/include/linux/huge_mm.h
index ae3d8e2fd9e2..b73fe864de13 100644
--- a/include/linux/huge_mm.h
+++ b/include/linux/huge_mm.h
@@ -238,6 +238,12 @@ static inline spinlock_t *pmd_trans_huge_lock(pmd_t *pmd,
else
return NULL;
}
+/**
+ * Returns true if a given pud maps a thp, false otherwise.
+ *
+ * Note that if it returns true, this routine returns without unlocking page
+ * table lock. So callers must unlock it.
+ */
static inline spinlock_t *pud_trans_huge_lock(pud_t *pud,
struct vm_area_struct *vma)
{
diff --git a/mm/huge_memory.c b/mm/huge_memory.c
index eb2e4ecb76aa..ae4c2116be07 100644
--- a/mm/huge_memory.c
+++ b/mm/huge_memory.c
@@ -2006,12 +2006,6 @@ spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma)
return NULL;
}

-/*
- * Returns true if a given pud maps a thp, false otherwise.
- *
- * Note that if it returns true, this routine returns without unlocking page
- * table lock. So callers must unlock it.
- */
spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma)
{
spinlock_t *ptl;
Thanks!
>
>> Signed-off-by: Miaohe Lin <linmiaohe@huawei.com>
>> ---
>> mm/huge_memory.c | 6 +++---
>> 1 file changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/mm/huge_memory.c b/mm/huge_memory.c
>> index 83fb6c3442ff..a26580da8011 100644
>> --- a/mm/huge_memory.c
>> +++ b/mm/huge_memory.c
>> @@ -1903,10 +1903,10 @@ spinlock_t *__pmd_trans_huge_lock(pmd_t *pmd, struct vm_area_struct *vma)
>> }
>>
>> /*
>> - * Returns true if a given pud maps a thp, false otherwise.
>> + * Returns page table lock pointer if a given pud maps a thp, NULL otherwise.
>> *
>> - * Note that if it returns true, this routine returns without unlocking page
>> - * table lock. So callers must unlock it.
>> + * Note that if it returns page table lock pointe, this routine returns without
>> + * unlocking page table lock. So callers must unlock it.
>> */
>> spinlock_t *__pud_trans_huge_lock(pud_t *pud, struct vm_area_struct *vma)
>> {
>> --
>> 2.23.0
>>
>
> .
>

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