From: Matthew Wilcox <willy@infradead.org>
To: linux-mm@kvack.org
Cc: "Matthew Wilcox" <mawilcox@microsoft.com>,
"Andrew Morton" <akpm@linux-foundation.org>,
"Kirill A . Shutemov" <kirill.shutemov@linux.intel.com>,
"Christoph Lameter" <cl@linux.com>,
"Lai Jiangshan" <jiangshanlai@gmail.com>,
"Pekka Enberg" <penberg@kernel.org>,
"Vlastimil Babka" <vbabka@suse.cz>,
"Dave Hansen" <dave.hansen@linux.intel.com>,
"Jérôme Glisse" <jglisse@redhat.com>
Subject: [PATCH v6 13/17] mm: Add hmm_data to struct page
Date: Fri, 18 May 2018 12:45:15 -0700 [thread overview]
Message-ID: <20180518194519.3820-14-willy@infradead.org> (raw)
In-Reply-To: <20180518194519.3820-1-willy@infradead.org>
From: Matthew Wilcox <mawilcox@microsoft.com>
Make hmm_data an explicit member of the struct page union.
Signed-off-by: Matthew Wilcox <mawilcox@microsoft.com>
Acked-by: Vlastimil Babka <vbabka@suse.cz>
---
include/linux/hmm.h | 8 ++------
include/linux/mm_types.h | 12 ++++++------
2 files changed, 8 insertions(+), 12 deletions(-)
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index 39988924de3a..91c1b2dccbbb 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -522,9 +522,7 @@ void hmm_devmem_remove(struct hmm_devmem *devmem);
static inline void hmm_devmem_page_set_drvdata(struct page *page,
unsigned long data)
{
- unsigned long *drvdata = (unsigned long *)&page->pgmap;
-
- drvdata[1] = data;
+ page->hmm_data = data;
}
/*
@@ -535,9 +533,7 @@ static inline void hmm_devmem_page_set_drvdata(struct page *page,
*/
static inline unsigned long hmm_devmem_page_get_drvdata(const struct page *page)
{
- const unsigned long *drvdata = (const unsigned long *)&page->pgmap;
-
- return drvdata[1];
+ return page->hmm_data;
}
diff --git a/include/linux/mm_types.h b/include/linux/mm_types.h
index 7eb7092424b7..530a9a2b039b 100644
--- a/include/linux/mm_types.h
+++ b/include/linux/mm_types.h
@@ -146,15 +146,15 @@ struct page {
spinlock_t ptl;
#endif
};
+ struct { /* ZONE_DEVICE pages */
+ /** @pgmap: Points to the hosting device page map. */
+ struct dev_pagemap *pgmap;
+ unsigned long hmm_data;
+ unsigned long _zd_pad_1; /* uses mapping */
+ };
/** @rcu_head: You can use this to free a page by RCU. */
struct rcu_head rcu_head;
-
- /**
- * @pgmap: For ZONE_DEVICE pages, this points to the hosting
- * device page map.
- */
- struct dev_pagemap *pgmap;
};
union { /* This union is 4 bytes in size. */
--
2.17.0
next prev parent reply other threads:[~2018-05-18 19:47 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-05-18 19:45 [PATCH v6 00/17] Rearrange struct page Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 01/17] s390: Use _refcount for pgtables Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 02/17] mm: Split page_type out from _mapcount Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 03/17] mm: Mark pages in use for page tables Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 04/17] mm: Switch s_mem and slab_cache in struct page Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 05/17] mm: Move 'private' union within " Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 06/17] mm: Move _refcount out of struct page union Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 07/17] mm: Combine first three unions in struct page Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 08/17] mm: Use page->deferred_list Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 09/17] mm: Move lru union within struct page Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 10/17] mm: Combine LRU and main union in " Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 11/17] mm: Improve struct page documentation Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 12/17] mm: Add pt_mm to struct page Matthew Wilcox
2018-05-18 19:45 ` Matthew Wilcox [this message]
2018-05-18 19:45 ` [PATCH v6 14/17] slab,slub: Remove rcu_head size checks Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 15/17] slub: Remove kmem_cache->reserved Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 16/17] slub: Remove 'reserved' file from sysfs Matthew Wilcox
2018-05-18 19:45 ` [PATCH v6 17/17] mm: Distinguish VMalloc pages Matthew Wilcox
2018-05-22 16:10 ` Andrey Ryabinin
2018-05-22 17:58 ` Matthew Wilcox
2018-05-22 19:49 ` Andrew Morton
2018-05-22 19:57 ` Andrey Ryabinin
2018-05-22 20:19 ` Matthew Wilcox
2018-05-22 20:48 ` Andrew Morton
2018-05-22 21:45 ` Matthew Wilcox
2018-05-22 23:02 ` Andrew Morton
2018-05-23 6:36 ` Michal Hocko
2018-05-23 6:34 ` Michal Hocko
2018-05-23 9:14 ` Andrey Ryabinin
2018-05-23 9:25 ` Michal Hocko
2018-05-23 9:28 ` Andrey Ryabinin
2018-05-23 9:52 ` Michal Hocko
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