linux-kernel - [PATCH v4 01/14] proc: Refactor pde_get_unmapped

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Date: Mon, 25 Mar 2024 19:16:43 -0700
From: Rick Edgecombe <rick.p.edgecombe@...el.com>
To: Liam.Howlett@...cle.com,
	akpm@...ux-foundation.org,
	bp@...en8.de,
	broonie@...nel.org,
	christophe.leroy@...roup.eu,
	dave.hansen@...ux.intel.com,
	debug@...osinc.com,
	hpa@...or.com,
	keescook@...omium.org,
	kirill.shutemov@...ux.intel.com,
	luto@...nel.org,
	mingo@...hat.com,
	peterz@...radead.org,
	tglx@...utronix.de,
	x86@...nel.org
Cc: rick.p.edgecombe@...el.com,
	linux-kernel@...r.kernel.org,
	linux-mm@...ck.org
Subject: [PATCH v4 01/14] proc: Refactor pde_get_unmapped_area as prep

Future changes will perform a treewide change to remove the indirect
branch that is involved in calling mm->get_unmapped_area(). After doing
this, the function will no longer be able to be handled as a function
pointer. To make the treewide change diff cleaner and easier to review,
refactor pde_get_unmapped_area() such that mm->get_unmapped_area() is
called without being stored in a local function pointer. With this in
refactoring, follow on changes will be able to simply replace the call
site with a future function that calls it directly.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
v4:
 - New patch split from "mm: Switch mm->get_unmapped_area() to a flag"
   (Christophe Leroy)
---
 fs/proc/inode.c | 9 +++------
 1 file changed, 3 insertions(+), 6 deletions(-)

diff --git a/fs/proc/inode.c b/fs/proc/inode.c
index dcd513dccf55..75396a24fd8c 100644
--- a/fs/proc/inode.c
+++ b/fs/proc/inode.c
@@ -451,15 +451,12 @@ pde_get_unmapped_area(struct proc_dir_entry *pde, struct file *file, unsigned lo
 			   unsigned long len, unsigned long pgoff,
 			   unsigned long flags)
 {
-	typeof_member(struct proc_ops, proc_get_unmapped_area) get_area;
+	if (pde->proc_ops->proc_get_unmapped_area)
+		return pde->proc_ops->proc_get_unmapped_area(file, orig_addr, len, pgoff, flags);
 
-	get_area = pde->proc_ops->proc_get_unmapped_area;
 #ifdef CONFIG_MMU
-	if (!get_area)
-		get_area = current->mm->get_unmapped_area;
+	return current->mm->get_unmapped_area(file, orig_addr, len, pgoff, flags);
 #endif
-	if (get_area)
-		return get_area(file, orig_addr, len, pgoff, flags);
 	return orig_addr;
 }
 
-- 
2.34.1