diff options
| author | Jérôme Glisse | 2017-09-09 01:12:32 +0200 |
|---|---|---|
| committer | Linus Torvalds | 2017-09-09 03:26:46 +0200 |
| commit | 6b368cd4a44ce95b33f1d31f2f932e6ae707f319 (patch) | |
| tree | 9d22ab2947db9a2d2e275b3a25eec66ea0e0b132 /include/linux/mm.h | |
| parent | mm/hmm: add new helper to hotplug CDM memory region (diff) | |
| download | kernel-qcow2-linux-6b368cd4a44ce95b33f1d31f2f932e6ae707f319.tar.gz kernel-qcow2-linux-6b368cd4a44ce95b33f1d31f2f932e6ae707f319.tar.xz kernel-qcow2-linux-6b368cd4a44ce95b33f1d31f2f932e6ae707f319.zip | |
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/mm.h')
| -rw-r--r-- | include/linux/mm.h | 26 |
1 files changed, 17 insertions, 9 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index de66a1127db4..5195e272fc4a 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -800,18 +800,27 @@ static inline bool is_zone_device_page(const struct page *page) } #endif -#if IS_ENABLED(CONFIG_DEVICE_PRIVATE) || IS_ENABLED(CONFIG_DEVICE_PUBLIC) +#if defined(CONFIG_DEVICE_PRIVATE) || defined(CONFIG_DEVICE_PUBLIC) void put_zone_device_private_or_public_page(struct page *page); -#else +DECLARE_STATIC_KEY_FALSE(device_private_key); +#define IS_HMM_ENABLED static_branch_unlikely(&device_private_key) +static inline bool is_device_private_page(const struct page *page); +static inline bool is_device_public_page(const struct page *page); +#else /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */ static inline void put_zone_device_private_or_public_page(struct page *page) { } +#define IS_HMM_ENABLED 0 +static inline bool is_device_private_page(const struct page *page) +{ + return false; +} +static inline bool is_device_public_page(const struct page *page) +{ + return false; +} #endif /* CONFIG_DEVICE_PRIVATE || CONFIG_DEVICE_PUBLIC */ -static inline bool is_device_private_page(const struct page *page); -static inline bool is_device_public_page(const struct page *page); - -DECLARE_STATIC_KEY_FALSE(device_private_key); static inline void get_page(struct page *page) { @@ -834,9 +843,8 @@ static inline void put_page(struct page *page) * free and we need to inform the device driver through callback. See * include/linux/memremap.h and HMM for details. */ - if (static_branch_unlikely(&device_private_key) && - unlikely(is_device_private_page(page) || - is_device_public_page(page))) { + if (IS_HMM_ENABLED && unlikely(is_device_private_page(page) || + unlikely(is_device_public_page(page)))) { put_zone_device_private_or_public_page(page); return; } |