The patch titled
Subject: zsmalloc: switch from alloc_vm_area to get_vm_area
has been removed from the -mm tree. Its filename was
zsmalloc-switch-from-alloc_vm_area-to-get_vm_area.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Christoph Hellwig <hch@xxxxxx>
Subject: zsmalloc: switch from alloc_vm_area to get_vm_area
Just manually pre-fault the PTEs using apply_to_page_range.
Link: https://lkml.kernel.org/r/20201002122204.1534411-6-hch@xxxxxx
Signed-off-by: Christoph Hellwig <hch@xxxxxx>
Co-developed-by: Minchan Kim <minchan@xxxxxxxxxx>
Cc: Boris Ostrovsky <boris.ostrovsky@xxxxxxxxxx>
Cc: Chris Wilson <chris@xxxxxxxxxxxxxxxxxx>
Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
Cc: Joonas Lahtinen <joonas.lahtinen@xxxxxxxxxxxxxxx>
Cc: Juergen Gross <jgross@xxxxxxxx>
Cc: Matthew Auld <matthew.auld@xxxxxxxxx>
Cc: "Matthew Wilcox (Oracle)" <willy@xxxxxxxxxxxxx>
Cc: Nitin Gupta <ngupta@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>
Cc: Stefano Stabellini <sstabellini@xxxxxxxxxx>
Cc: Tvrtko Ursulin <tvrtko.ursulin@xxxxxxxxx>
Cc: Uladzislau Rezki (Sony) <urezki@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
mm/zsmalloc.c | 10 ++++++++--
1 file changed, 8 insertions(+), 2 deletions(-)
--- a/mm/zsmalloc.c~zsmalloc-switch-from-alloc_vm_area-to-get_vm_area
+++ a/mm/zsmalloc.c
@@ -1122,10 +1122,16 @@ static inline int __zs_cpu_up(struct map
*/
if (area->vm)
return 0;
- area->vm = alloc_vm_area(PAGE_SIZE * 2, NULL);
+ area->vm = get_vm_area(PAGE_SIZE * 2, 0);
if (!area->vm)
return -ENOMEM;
- return 0;
+
+ /*
+ * Populate ptes in advance to avoid pte allocation with GFP_KERNEL
+ * in non-preemtible context of zs_map_object.
+ */
+ return apply_to_page_range(&init_mm, (unsigned long)area->vm->addr,
+ PAGE_SIZE * 2, NULL, NULL);
}
static inline void __zs_cpu_down(struct mapping_area *area)
_
Patches currently in -mm which might be from hch@xxxxxx are
