The patch titled
Subject: mm/vmalloc: separate put pages and flush VM flags
has been added to the -mm tree. Its filename is
mm-vmalloc-separate-put-pages-and-flush-vm-flags.patch
This patch should soon appear at
https://ozlabs.org/~akpm/mmots/broken-out/mm-vmalloc-separate-put-pages-and-flush-vm-flags.patch
and later at
https://ozlabs.org/~akpm/mmotm/broken-out/mm-vmalloc-separate-put-pages-and-flush-vm-flags.patch
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------------------------------------------------------
From: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>
Subject: mm/vmalloc: separate put pages and flush VM flags
When VM_MAP_PUT_PAGES was added, it was defined with the same value as
VM_FLUSH_RESET_PERMS. This doesn't seem like it will cause any big
functional problems other than some excess flushing for VM_MAP_PUT_PAGES
allocations.
Redefine VM_MAP_PUT_PAGES to have its own value. Also, rearrange things
so flags are less likely to be missed in the future.
Link: https://lkml.kernel.org/r/20210122233706.9304-1-rick.p.edgecombe@xxxxxxxxx
Fixes: b944afc9d64d ("mm: add a VM_MAP_PUT_PAGES flag for vmap")
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@xxxxxxxxx>
Suggested-by: Matthew Wilcox <willy@xxxxxxxxxxxxx>
Cc: Miaohe Lin <linmiaohe@xxxxxxxxxx>
Cc: Christoph Hellwig <hch@xxxxxx>
Cc: Daniel Axtens <dja@xxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
include/linux/vmalloc.h | 9 ++-------
1 file changed, 2 insertions(+), 7 deletions(-)
--- a/include/linux/vmalloc.h~mm-vmalloc-separate-put-pages-and-flush-vm-flags
+++ a/include/linux/vmalloc.h
@@ -24,7 +24,8 @@ struct notifier_block; /* in notifier.h
#define VM_UNINITIALIZED 0x00000020 /* vm_struct is not fully initialized */
#define VM_NO_GUARD 0x00000040 /* don't add guard page */
#define VM_KASAN 0x00000080 /* has allocated kasan shadow memory */
-#define VM_MAP_PUT_PAGES 0x00000100 /* put pages and free array in vfree */
+#define VM_FLUSH_RESET_PERMS 0x00000100 /* reset direct map and flush TLB on unmap, can't be freed in atomic context */
+#define VM_MAP_PUT_PAGES 0x00000200 /* put pages and free array in vfree */
/*
* VM_KASAN is used slighly differently depending on CONFIG_KASAN_VMALLOC.
@@ -37,12 +38,6 @@ struct notifier_block; /* in notifier.h
* determine which allocations need the module shadow freed.
*/
-/*
- * Memory with VM_FLUSH_RESET_PERMS cannot be freed in an interrupt or with
- * vfree_atomic().
- */
-#define VM_FLUSH_RESET_PERMS 0x00000100 /* Reset direct map and flush TLB on unmap */
-
/* bits [20..32] reserved for arch specific ioremap internals */
/*
_
Patches currently in -mm which might be from rick.p.edgecombe@xxxxxxxxx are
mm-vmalloc-separate-put-pages-and-flush-vm-flags.patch
