linux-kernel - [PATCH v2 14/14] include: reduce dependencies on linux/mm.h

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Date: Thu, 22 Feb 2024 12:50:55 +0100
From: Max Kellermann <max.kellermann@...os.com>
To: akpm@...ux-foundation.org,
	linux-mm@...ck.org,
	linux-kernel@...r.kernel.org
Cc: willy@...radead.org,
	Max Kellermann <max.kellermann@...os.com>
Subject: [PATCH v2 14/14] include: reduce dependencies on linux/mm.h

Replace <linux/mm.h> with the smaller pieces that were just splitted
out.  This affects a few headers that are included by many, e.g. bio.h
and highmem.h, which now no longer depend on the fat <linux/mm.h>
header.

For this, several missing includes need to be added because they are
no longer indirectly included, e.g. <linux/fs.h>.

Signed-off-by: Max Kellermann <max.kellermann@...os.com>
---
 include/linux/bio.h              | 2 ++
 include/linux/dma-mapping.h      | 1 +
 include/linux/highmem-internal.h | 2 ++
 include/linux/highmem.h          | 4 +++-
 include/linux/scatterlist.h      | 2 +-
 include/linux/skbuff.h           | 4 ++++
 lib/scatterlist.c                | 1 +
 7 files changed, 14 insertions(+), 2 deletions(-)

diff --git a/include/linux/bio.h b/include/linux/bio.h
index 875d792bffff..e2f24d7235d3 100644
--- a/include/linux/bio.h
+++ b/include/linux/bio.h
@@ -5,7 +5,9 @@
 #ifndef __LINUX_BIO_H
 #define __LINUX_BIO_H
 
+#include <linux/fs.h> // for struct kiocb, IOCB_NOWAIT
 #include <linux/mempool.h>
+#include <linux/mm/folio_next.h>
 /* struct bio, bio_vec and BIO_* flags are defined in blk_types.h */
 #include <linux/blk_types.h>
 #include <linux/uio.h>
diff --git a/include/linux/dma-mapping.h b/include/linux/dma-mapping.h
index 4a658de44ee9..37d5591039c7 100644
--- a/include/linux/dma-mapping.h
+++ b/include/linux/dma-mapping.h
@@ -11,6 +11,7 @@
 #include <linux/scatterlist.h>
 #include <linux/bug.h>
 #include <linux/mem_encrypt.h>
+#include <linux/mm/vmalloc_addr.h>
 
 /**
  * List of possible attributes associated with a DMA mapping. The semantics
diff --git a/include/linux/highmem-internal.h b/include/linux/highmem-internal.h
index a3028e400a9c..a479e6b7c54c 100644
--- a/include/linux/highmem-internal.h
+++ b/include/linux/highmem-internal.h
@@ -2,6 +2,8 @@
 #ifndef _LINUX_HIGHMEM_INTERNAL_H
 #define _LINUX_HIGHMEM_INTERNAL_H
 
+#include <linux/mm/page_address.h>
+
 /*
  * Outside of CONFIG_HIGHMEM to support X86 32bit iomap_atomic() cruft.
  */
diff --git a/include/linux/highmem.h b/include/linux/highmem.h
index 00341b56d291..10a165a913ad 100644
--- a/include/linux/highmem.h
+++ b/include/linux/highmem.h
@@ -7,7 +7,9 @@
 #include <linux/bug.h>
 #include <linux/cacheflush.h>
 #include <linux/kmsan.h>
-#include <linux/mm.h>
+#include <linux/mm/folio_size.h> // for page_size()
+#include <linux/mm/folio_usage.h> // for folio_put()
+#include <linux/mm/page_address.h>
 #include <linux/uaccess.h>
 #include <linux/hardirq.h>
 
diff --git a/include/linux/scatterlist.h b/include/linux/scatterlist.h
index 0516e64dc03e..9221bba82b23 100644
--- a/include/linux/scatterlist.h
+++ b/include/linux/scatterlist.h
@@ -5,7 +5,7 @@
 #include <linux/string.h>
 #include <linux/types.h>
 #include <linux/bug.h>
-#include <linux/mm.h>
+#include <linux/mm/page_address.h>
 #include <asm/io.h>
 
 #ifdef CONFIG_UML
diff --git a/include/linux/skbuff.h b/include/linux/skbuff.h
index 28c7cb7ce251..06fedc08b998 100644
--- a/include/linux/skbuff.h
+++ b/include/linux/skbuff.h
@@ -16,6 +16,10 @@
 #include <linux/bug.h>
 #include <linux/bvec.h>
 #include <linux/cache.h>
+#include <linux/gfp.h> // for alloc_pages_node()
+#include <linux/mm/folio_usage.h> // for get_page(), put_page()
+#include <linux/mm/folio_zone.h> // for page_to_nid()
+#include <linux/mm/pfmemalloc.h> // for page_is_pfmemalloc()
 #include <linux/rbtree.h>
 #include <linux/socket.h>
 #include <linux/refcount.h>
diff --git a/lib/scatterlist.c b/lib/scatterlist.c
index 68b45c82c37a..03599396f15d 100644
--- a/lib/scatterlist.c
+++ b/lib/scatterlist.c
@@ -9,6 +9,7 @@
 #include <linux/scatterlist.h>
 #include <linux/highmem.h>
 #include <linux/kmemleak.h>
+#include <linux/mm.h>
 #include <linux/bvec.h>
 #include <linux/uio.h>
 
-- 
2.39.2