From cb10c28ac82c9b7a5e9b3b1dc7157036c20c36dd Mon Sep 17 00:00:00 2001
From: Christoph Hellwig <hch@lst.de>
Date: Mon, 25 Mar 2024 07:45:41 +0800
Subject: mm: remove follow_pfn

Remove follow_pfn now that the last user is gone.

Link: https://lkml.kernel.org/r/20240324234542.2038726-3-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Fei Li <fei1.li@intel.com>
Cc: Ingo Molnar <mingo@kernel.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Nathan Chancellor <nathan@kernel.org>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---
 mm/nommu.c | 21 ---------------------
 1 file changed, 21 deletions(-)

(limited to 'mm/nommu.c')

diff --git a/mm/nommu.c b/mm/nommu.c
index 88b646ea6d30..331d2f778695 100644
--- a/mm/nommu.c
+++ b/mm/nommu.c
@@ -110,27 +110,6 @@ unsigned int kobjsize(const void *objp)
 	return page_size(page);
 }
 
-/**
- * follow_pfn - look up PFN at a user virtual address
- * @vma: memory mapping
- * @address: user virtual address
- * @pfn: location to store found PFN
- *
- * Only IO mappings and raw PFN mappings are allowed.
- *
- * Returns zero and the pfn at @pfn on success, -ve otherwise.
- */
-int follow_pfn(struct vm_area_struct *vma, unsigned long address,
-	unsigned long *pfn)
-{
-	if (!(vma->vm_flags & (VM_IO | VM_PFNMAP)))
-		return -EINVAL;
-
-	*pfn = address >> PAGE_SHIFT;
-	return 0;
-}
-EXPORT_SYMBOL(follow_pfn);
-
 void vfree(const void *addr)
 {
 	kfree(addr);
-- 
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