[merged mm-stable] mm-remove-__vfree_deferred.patch removed from -mm tree

[merged mm-stable] mm-remove-__vfree_deferred.patch removed from -mm tree

[Andrew Morton]

The quilt patch titled
     Subject: mm: remove __vfree_deferred
has been removed from the -mm tree.  Its filename was
     mm-remove-__vfree_deferred.patch

This patch was dropped because it was merged into the mm-stable branch
of git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm

------------------------------------------------------
From: Christoph Hellwig <hch@lst.de>
Subject: mm: remove __vfree_deferred
Date: Sat, 21 Jan 2023 08:10:44 +0100

Fold __vfree_deferred into vfree_atomic, and call vfree_atomic early on
from vfree if called from interrupt context so that the extra low-level
helper can be avoided.

Link: https://lkml.kernel.org/r/20230121071051.1143058-4-hch@lst.de
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Uladzislau Rezki (Sony) <urezki@gmail.com>
Reviewed-by: David Hildenbrand <david@redhat.com>
Cc: Alexander Potapenko <glider@google.com>
Cc: Andrey Konovalov <andreyknvl@gmail.com>
Cc: Andrey Ryabinin <ryabinin.a.a@gmail.com>
Cc: Dmitry Vyukov <dvyukov@google.com>
Cc: Vincenzo Frascino <vincenzo.frascino@arm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
---


--- a/mm/vmalloc.c~mm-remove-__vfree_deferred
+++ a/mm/vmalloc.c
@@ -2754,20 +2754,6 @@ static void __vunmap(const void *addr, i
 	kfree(area);
 }
 
-static inline void __vfree_deferred(const void *addr)
-{
-	/*
-	 * Use raw_cpu_ptr() because this can be called from preemptible
-	 * context. Preemption is absolutely fine here, because the llist_add()
-	 * implementation is lockless, so it works even if we are adding to
-	 * another cpu's list. schedule_work() should be fine with this too.
-	 */
-	struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);
-
-	if (llist_add((struct llist_node *)addr, &p->list))
-		schedule_work(&p->wq);
-}
-
 /**
  * vfree_atomic - release memory allocated by vmalloc()
  * @addr:	  memory base address
@@ -2777,13 +2763,19 @@ static inline void __vfree_deferred(cons
  */
 void vfree_atomic(const void *addr)
 {
-	BUG_ON(in_nmi());
+	struct vfree_deferred *p = raw_cpu_ptr(&vfree_deferred);
 
+	BUG_ON(in_nmi());
 	kmemleak_free(addr);
 
-	if (!addr)
-		return;
-	__vfree_deferred(addr);
+	/*
+	 * Use raw_cpu_ptr() because this can be called from preemptible
+	 * context. Preemption is absolutely fine here, because the llist_add()
+	 * implementation is lockless, so it works even if we are adding to
+	 * another cpu's list. schedule_work() should be fine with this too.
+	 */
+	if (addr && llist_add((struct llist_node *)addr, &p->list))
+		schedule_work(&p->wq);
 }
 
 /**
@@ -2805,17 +2797,16 @@ void vfree_atomic(const void *addr)
  */
 void vfree(const void *addr)
 {
-	BUG_ON(in_nmi());
+	if (unlikely(in_interrupt())) {
+		vfree_atomic(addr);
+		return;
+	}
 
+	BUG_ON(in_nmi());
 	kmemleak_free(addr);
+	might_sleep();
 
-	might_sleep_if(!in_interrupt());
-
-	if (!addr)
-		return;
-	if (unlikely(in_interrupt()))
-		__vfree_deferred(addr);
-	else
+	if (addr)
 		__vunmap(addr, 1);
 }
 EXPORT_SYMBOL(vfree);
_

Patches currently in -mm which might be from hch@lst.de are