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authorJérôme Glisse <jglisse@redhat.com>2017-09-08 16:12:32 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-08 18:26:46 -0700
commit6b368cd4a44ce95b33f1d31f2f932e6ae707f319 (patch)
tree9d22ab2947db9a2d2e275b3a25eec66ea0e0b132 /include/linux/memremap.h
parentd3df0a423397c9a1ae05c3857e8c04240dd85e68 (diff)
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mm/hmm: avoid bloating arch that do not make use of HMM
This moves all new code including new page migration helper behind kernel Kconfig option so that there is no codee bloat for arch or user that do not want to use HMM or any of its associated features. arm allyesconfig (without all the patchset, then with and this patch): text data bss dec hex filename 83721896 46511131 27582964 157815991 96814b7 ../without/vmlinux 83722364 46511131 27582964 157816459 968168b vmlinux [jglisse@redhat.com: struct hmm is only use by HMM mirror functionality] Link: http://lkml.kernel.org/r/20170825213133.27286-1-jglisse@redhat.com [sfr@canb.auug.org.au: fix build (arm multi_v7_defconfig)] Link: http://lkml.kernel.org/r/20170828181849.323ab81b@canb.auug.org.au Link: http://lkml.kernel.org/r/20170818032858.7447-1-jglisse@redhat.com Signed-off-by: Jérôme Glisse <jglisse@redhat.com> Signed-off-by: Stephen Rothwell <sfr@canb.auug.org.au> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Arnd Bergmann <arnd@arndb.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'include/linux/memremap.h')
-rw-r--r--include/linux/memremap.h22
1 files changed, 7 insertions, 15 deletions
diff --git a/include/linux/memremap.h b/include/linux/memremap.h
index f8ee1c73ad2d..79f8ba7c3894 100644
--- a/include/linux/memremap.h
+++ b/include/linux/memremap.h
@@ -138,18 +138,6 @@ void *devm_memremap_pages(struct device *dev, struct resource *res,
struct dev_pagemap *find_dev_pagemap(resource_size_t phys);
static inline bool is_zone_device_page(const struct page *page);
-
-static inline bool is_device_private_page(const struct page *page)
-{
- return is_zone_device_page(page) &&
- page->pgmap->type == MEMORY_DEVICE_PRIVATE;
-}
-
-static inline bool is_device_public_page(const struct page *page)
-{
- return is_zone_device_page(page) &&
- page->pgmap->type == MEMORY_DEVICE_PUBLIC;
-}
#else
static inline void *devm_memremap_pages(struct device *dev,
struct resource *res, struct percpu_ref *ref,
@@ -168,17 +156,21 @@ static inline struct dev_pagemap *find_dev_pagemap(resource_size_t phys)
{
return NULL;
}
+#endif
+#if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC)
static inline bool is_device_private_page(const struct page *page)
{
- return false;
+ return is_zone_device_page(page) &&
+ page->pgmap->type == MEMORY_DEVICE_PRIVATE;
}
static inline bool is_device_public_page(const struct page *page)
{
- return false;
+ return is_zone_device_page(page) &&
+ page->pgmap->type == MEMORY_DEVICE_PUBLIC;
}
-#endif
+#endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */
/**
* get_dev_pagemap() - take a new live reference on the dev_pagemap for @pfn