[PATCH 1/4] mm/mprotect: encourage inlining with __always_inline

Pedro Falcato
2026-03-19T18:31:29Z

Encourage the compiler to inline batch PTE logic and resolve constant
branches by adding __always_inline strategically.

Signed-off-by: Pedro Falcato <pfalcato@suse.de>
---
mm/mprotect.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/mm/mprotect.c b/mm/mprotect.c
index 9681f055b9fc..1bd0d4aa07c2 100644
--- a/mm/mprotect.c
+++ b/mm/mprotect.c
@@ -103,7 +103,7 @@ bool can_change_pte_writable(struct vm_area_struct *vma, unsigned long addr,
return can_change_shared_pte_writable(vma, pte);
}

-static int mprotect_folio_pte_batch(struct folio *folio, pte_t *ptep,
+static __always_inline int mprotect_folio_pte_batch(struct folio *folio, pte_t *ptep,
pte_t pte, int max_nr_ptes, fpb_t flags)
{
/* No underlying folio, so cannot batch */
@@ -117,9 +117,9 @@ static int mprotect_folio_pte_batch(struct folio *folio, pte_t *ptep,
}

/* Set nr_ptes number of ptes, starting from idx */
-static void prot_commit_flush_ptes(struct vm_area_struct *vma, unsigned long addr,
- pte_t *ptep, pte_t oldpte, pte_t ptent, int nr_ptes,
- int idx, bool set_write, struct mmu_gather *tlb)
+static __always_inline void prot_commit_flush_ptes(struct vm_area_struct *vma,
+ unsigned long addr, pte_t *ptep, pte_t oldpte, pte_t ptent,
+ int nr_ptes, int idx, bool set_write, struct mmu_gather *tlb)
{
/*
* Advance the position in the batch by idx; note that if idx > 0,
@@ -169,7 +169,7 @@ static int page_anon_exclusive_sub_batch(int start_idx, int max_len,
* pte of the batch. Therefore, we must individually check all pages and
* retrieve sub-batches.
*/
-static void commit_anon_folio_batch(struct vm_area_struct *vma,
+static __always_inline void commit_anon_folio_batch(struct vm_area_struct *vma,
struct folio *folio, struct page *first_page, unsigned long addr, pte_t *ptep,
pte_t oldpte, pte_t ptent, int nr_ptes, struct mmu_gather *tlb)
{
--
2.53.0