From: Pedro Falcato <pedro.falcato@gmail.com>
Date: Sat, 17 Aug 2024 00:18:33 +0000 (+0100)
Subject: mm: remove can_modify_mm()
X-Git-Url: https://www.infradead.org/git/?a=commitdiff_plain;h=5b3db2b812a1f86dfab587324d198a5d10c7a5cf;p=users%2Fwilly%2Fxarray.git

mm: remove can_modify_mm()

With no more users in the tree, we can finally remove can_modify_mm().

Link: https://lkml.kernel.org/r/20240817-mseal-depessimize-v3-6-d8d2e037df30@gmail.com
Signed-off-by: Pedro Falcato <pedro.falcato@gmail.com>
Reviewed-by: Liam R. Howlett <Liam.Howlett@Oracle.com>
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@oracle.com>
Cc: Jeff Xu <jeffxu@chromium.org>
Cc: Kees Cook <kees@kernel.org>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Shuah Khan <shuah@kernel.org>
Cc: Vlastimil Babka <vbabka@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---

diff --git a/mm/internal.h b/mm/internal.h
index 241cf46a19f5..82fb9f1b0cd4 100644
--- a/mm/internal.h
+++ b/mm/internal.h
@@ -1359,25 +1359,11 @@ static inline int can_do_mseal(unsigned long flags)
 	return 0;
 }
 
-bool can_modify_mm(struct mm_struct *mm, unsigned long start,
-		unsigned long end);
 #else
 static inline int can_do_mseal(unsigned long flags)
 {
 	return -EPERM;
 }
-
-static inline bool can_modify_mm(struct mm_struct *mm, unsigned long start,
-		unsigned long end)
-{
-	return true;
-}
-
-static inline bool can_modify_mm_madv(struct mm_struct *mm, unsigned long start,
-		unsigned long end, int behavior)
-{
-	return true;
-}
 #endif
 
 #ifdef CONFIG_SHRINKER_DEBUG
diff --git a/mm/mseal.c b/mm/mseal.c
index fdd1666344fa..28cd17d7aaf2 100644
--- a/mm/mseal.c
+++ b/mm/mseal.c
@@ -53,27 +53,6 @@ static bool is_ro_anon(struct vm_area_struct *vma)
 	return false;
 }
 
-/*
- * Check if the vmas of a memory range are allowed to be modified.
- * the memory ranger can have a gap (unallocated memory).
- * return true, if it is allowed.
- */
-bool can_modify_mm(struct mm_struct *mm, unsigned long start, unsigned long end)
-{
-	struct vm_area_struct *vma;
-
-	VMA_ITERATOR(vmi, mm, start);
-
-	/* going through each vma to check. */
-	for_each_vma_range(vmi, vma, end) {
-		if (unlikely(!can_modify_vma(vma)))
-			return false;
-	}
-
-	/* Allow by default. */
-	return true;
-}
-
 /*
  * Check if a vma is allowed to be modified by madvise.
  */