linux-kernel - [PATCH] mm/vmalloc: Separate put pages and flush VM flags

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Date:   Wed, 20 Jan 2021 17:41:18 -0800
From:   Rick Edgecombe <rick.p.edgecombe@...el.com>
To:     akpm@...ux-foundation.org
Cc:     hch@....de, dja@...ens.net, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org,
        Rick Edgecombe <rick.p.edgecombe@...el.com>
Subject: [PATCH] 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, move the comment
and remove whitespace for VM_KASAN such that the flags lower down are less
likely to be missed in the future.

Fixes: b944afc9d64d ("mm: add a VM_MAP_PUT_PAGES flag for vmap")
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@...el.com>
---
 include/linux/vmalloc.h | 6 ++----
 1 file changed, 2 insertions(+), 4 deletions(-)

diff --git a/include/linux/vmalloc.h b/include/linux/vmalloc.h
index 80c0181c411d..0b3dd135aa5d 100644
--- a/include/linux/vmalloc.h
+++ b/include/linux/vmalloc.h
@@ -23,9 +23,6 @@ struct notifier_block;		/* in notifier.h */
 #define VM_DMA_COHERENT		0x00000010	/* dma_alloc_coherent */
 #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 */
-
 /*
  * VM_KASAN is used slighly differently depending on CONFIG_KASAN_VMALLOC.
  *
@@ -36,12 +33,13 @@ struct notifier_block;		/* in notifier.h */
  * Otherwise, VM_KASAN is set for kasan_module_alloc() allocations and used to
  * determine which allocations need the module shadow freed.
  */
-
+#define VM_KASAN		0x00000080      /* has allocated kasan shadow memory */
 /*
  * 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 */
+#define VM_MAP_PUT_PAGES	0x00000200	/* put pages and free array in vfree */
 
 /* bits [20..32] reserved for arch specific ioremap internals */
 
-- 
2.20.1