linux-kernel - [PATCH] mmap: remove the IA64-specific vma expansion implementation

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Date:   Mon, 13 Nov 2023 13:47:28 +0100
From:   Lukas Bulwahn <lukas.bulwahn@...il.com>
To:     Andrew Morton <akpm@...ux-foundation.org>,
        Ard Biesheuvel <ardb@...nel.org>, linux-mm@...ck.org
Cc:     kernel-janitors@...r.kernel.org, linux-kernel@...r.kernel.org,
        Lukas Bulwahn <lukas.bulwahn@...il.com>
Subject: [PATCH] mmap: remove the IA64-specific vma expansion implementation

With commit cf8e8658100d ("arch: Remove Itanium (IA-64) architecture"),
there is no need to keep the IA64-specific vma expansion.

Clean up the IA64-specific vma expansion implementation.

Signed-off-by: Lukas Bulwahn <lukas.bulwahn@...il.com>
---
 mm/mmap.c | 37 +------------------------------------
 1 file changed, 1 insertion(+), 36 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index 1971bfffcc03..72a3bdea4fa4 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -2207,42 +2207,7 @@ struct vm_area_struct *find_extend_vma_locked(struct mm_struct *mm, unsigned lon
 }
 #endif
 
-/*
- * IA64 has some horrid mapping rules: it can expand both up and down,
- * but with various special rules.
- *
- * We'll get rid of this architecture eventually, so the ugliness is
- * temporary.
- */
-#ifdef CONFIG_IA64
-static inline bool vma_expand_ok(struct vm_area_struct *vma, unsigned long addr)
-{
-	return REGION_NUMBER(addr) == REGION_NUMBER(vma->vm_start) &&
-		REGION_OFFSET(addr) < RGN_MAP_LIMIT;
-}
-
-/*
- * IA64 stacks grow down, but there's a special register backing store
- * that can grow up. Only sequentially, though, so the new address must
- * match vm_end.
- */
-static inline int vma_expand_up(struct vm_area_struct *vma, unsigned long addr)
-{
-	if (!vma_expand_ok(vma, addr))
-		return -EFAULT;
-	if (vma->vm_end != (addr & PAGE_MASK))
-		return -EFAULT;
-	return expand_upwards(vma, addr);
-}
-
-static inline bool vma_expand_down(struct vm_area_struct *vma, unsigned long addr)
-{
-	if (!vma_expand_ok(vma, addr))
-		return -EFAULT;
-	return expand_downwards(vma, addr);
-}
-
-#elif defined(CONFIG_STACK_GROWSUP)
+#if defined(CONFIG_STACK_GROWSUP)
 
 #define vma_expand_up(vma,addr) expand_upwards(vma, addr)
 #define vma_expand_down(vma, addr) (-EFAULT)
-- 
2.17.1