summaryrefslogtreecommitdiff
path: root/include/linux/hmm.h
diff options
context:
space:
mode:
authorJérôme Glisse <jglisse@redhat.com>2017-09-09 02:12:32 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2017-09-09 04:26:46 +0300
commit6b368cd4a44ce95b33f1d31f2f932e6ae707f319 (patch)
tree9d22ab2947db9a2d2e275b3a25eec66ea0e0b132 /include/linux/hmm.h
parentd3df0a423397c9a1ae05c3857e8c04240dd85e68 (diff)
downloadlinux-6b368cd4a44ce95b33f1d31f2f932e6ae707f319.tar.xz
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/hmm.h')
-rw-r--r--include/linux/hmm.h9
1 files changed, 6 insertions, 3 deletions
diff --git a/include/linux/hmm.h b/include/linux/hmm.h
index 8385e75356ca..28e14345bd8d 100644
--- a/include/linux/hmm.h
+++ b/include/linux/hmm.h
@@ -501,18 +501,21 @@ void hmm_device_put(struct hmm_device *hmm_device);
/* Below are for HMM internal use only! Not to be used by device driver! */
+#if IS_ENABLED(CONFIG_HMM_MIRROR)
void hmm_mm_destroy(struct mm_struct *mm);
static inline void hmm_mm_init(struct mm_struct *mm)
{
mm->hmm = NULL;
}
+#else /* IS_ENABLED(CONFIG_HMM_MIRROR) */
+static inline void hmm_mm_destroy(struct mm_struct *mm) {}
+static inline void hmm_mm_init(struct mm_struct *mm) {}
+#endif /* IS_ENABLED(CONFIG_HMM_MIRROR) */
-#else /* IS_ENABLED(CONFIG_HMM) */
-/* Below are for HMM internal use only! Not to be used by device driver! */
+#else /* IS_ENABLED(CONFIG_HMM) */
static inline void hmm_mm_destroy(struct mm_struct *mm) {}
static inline void hmm_mm_init(struct mm_struct *mm) {}
-
#endif /* IS_ENABLED(CONFIG_HMM) */
#endif /* LINUX_HMM_H */