[PATCH v6 08/18] arm64/mm: Convert set_pte_at() to set_ptes(..., 1)

Ryan Roberts
2024-02-15T10:32:50Z

Since set_ptes() was introduced, set_pte_at() has been implemented as a
generic macro around set_ptes(..., 1). So this change should continue to
generate the same code. However, making this change prepares us for the
transparent contpte support. It means we can reroute set_ptes() to
__set_ptes(). Since set_pte_at() is a generic macro, there will be no
equivalent __set_pte_at() to reroute to.

Note that a couple of calls to set_pte_at() remain in the arch code.
This is intentional, since those call sites are acting on behalf of
core-mm and should continue to call into the public set_ptes() rather
than the arch-private __set_ptes().

Tested-by: John Hubbard <jhubbard@nvidia.com>
Signed-off-by: Ryan Roberts <ryan.roberts@arm.com>
---
arch/arm64/include/asm/pgtable.h | 2 +-
arch/arm64/kernel/mte.c | 2 +-
arch/arm64/kvm/guest.c | 2 +-
arch/arm64/mm/fault.c | 2 +-
arch/arm64/mm/hugetlbpage.c | 10 +++++-----
5 files changed, 9 insertions(+), 9 deletions(-)

diff --git a/arch/arm64/include/asm/pgtable.h b/arch/arm64/include/asm/pgtable.h
index de034ca40bad..9a2df85eb493 100644
--- a/arch/arm64/include/asm/pgtable.h
+++ b/arch/arm64/include/asm/pgtable.h
@@ -1084,7 +1084,7 @@ static inline void arch_swap_restore(swp_entry_t entry, struct folio *folio)
#endif /* CONFIG_ARM64_MTE */

/*
- * On AArch64, the cache coherency is handled via the set_pte_at() function.
+ * On AArch64, the cache coherency is handled via the set_ptes() function.
*/
static inline void update_mmu_cache_range(struct vm_fault *vmf,
struct vm_area_struct *vma, unsigned long addr, pte_t *ptep,
diff --git a/arch/arm64/kernel/mte.c b/arch/arm64/kernel/mte.c
index a41ef3213e1e..59bfe2e96f8f 100644
--- a/arch/arm64/kernel/mte.c
+++ b/arch/arm64/kernel/mte.c
@@ -67,7 +67,7 @@ int memcmp_pages(struct page *page1, struct page *page2)
/*
* If the page content is identical but at least one of the pages is
* tagged, return non-zero to avoid KSM merging. If only one of the
- * pages is tagged, set_pte_at() may zero or change the tags of the
+ * pages is tagged, set_ptes() may zero or change the tags of the
* other page via mte_sync_tags().
*/
if (page_mte_tagged(page1) || page_mte_tagged(page2))
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index aaf1d4939739..6e0df623c8e9 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -1072,7 +1072,7 @@ int kvm_vm_ioctl_mte_copy_tags(struct kvm *kvm,
} else {
/*
* Only locking to serialise with a concurrent
- * set_pte_at() in the VMM but still overriding the
+ * set_ptes() in the VMM but still overriding the
* tags, hence ignoring the return value.
*/
try_page_mte_tagging(page);
diff --git a/arch/arm64/mm/fault.c b/arch/arm64/mm/fault.c
index a254761fa1bd..3235e23309ec 100644
--- a/arch/arm64/mm/fault.c
+++ b/arch/arm64/mm/fault.c
@@ -205,7 +205,7 @@ static void show_pte(unsigned long addr)
*
* It needs to cope with hardware update of the accessed/dirty state by other
* agents in the system and can safely skip the __sync_icache_dcache() call as,
- * like set_pte_at(), the PTE is never changed from no-exec to exec here.
+ * like set_ptes(), the PTE is never changed from no-exec to exec here.
*
* Returns whether or not the PTE actually changed.
*/
diff --git a/arch/arm64/mm/hugetlbpage.c b/arch/arm64/mm/hugetlbpage.c
index 2892f925ed66..27f6160890d1 100644
--- a/arch/arm64/mm/hugetlbpage.c
+++ b/arch/arm64/mm/hugetlbpage.c
@@ -247,12 +247,12 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,

if (!pte_present(pte)) {
for (i = 0; i < ncontig; i++, ptep++, addr += pgsize)
- set_pte_at(mm, addr, ptep, pte);
+ set_ptes(mm, addr, ptep, pte, 1);
return;
}

if (!pte_cont(pte)) {
- set_pte_at(mm, addr, ptep, pte);
+ set_ptes(mm, addr, ptep, pte, 1);
return;
}

@@ -263,7 +263,7 @@ void set_huge_pte_at(struct mm_struct *mm, unsigned long addr,
clear_flush(mm, addr, ptep, pgsize, ncontig);

for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
- set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
+ set_ptes(mm, addr, ptep, pfn_pte(pfn, hugeprot), 1);
}

pte_t *huge_pte_alloc(struct mm_struct *mm, struct vm_area_struct *vma,
@@ -471,7 +471,7 @@ int huge_ptep_set_access_flags(struct vm_area_struct *vma,

hugeprot = pte_pgprot(pte);
for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
- set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
+ set_ptes(mm, addr, ptep, pfn_pte(pfn, hugeprot), 1);

return 1;
}
@@ -500,7 +500,7 @@ void huge_ptep_set_wrprotect(struct mm_struct *mm,
pfn = pte_pfn(pte);

for (i = 0; i < ncontig; i++, ptep++, addr += pgsize, pfn += dpfn)
- set_pte_at(mm, addr, ptep, pfn_pte(pfn, hugeprot));
+ set_ptes(mm, addr, ptep, pfn_pte(pfn, hugeprot), 1);
}

pte_t huge_ptep_clear_flush(struct vm_area_struct *vma,
--
2.25.1