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mm/hmm: avoid bloating arch that do not make use of HMM

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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>
This commit is contained in:
Jérôme Glisse
2017-09-08 16:12:32 -07:00
committed by Linus Torvalds
parent d3df0a4233
commit 6b368cd4a4
8 changed files with 55 additions and 33 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
include/linux/migrate.h
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@@ -265,6 +265,7 @@ struct migrate_vma_ops {
void *private);
};
#if defined(CONFIG_MIGRATE_VMA_HELPER)
int migrate_vma(const struct migrate_vma_ops *ops,
struct vm_area_struct *vma,
unsigned long start,
@@ -272,6 +273,18 @@ int migrate_vma(const struct migrate_vma_ops *ops,
unsigned long *src,
unsigned long *dst,
void *private);
#else
static inline int migrate_vma(const struct migrate_vma_ops *ops,
struct vm_area_struct *vma,
unsigned long start,
unsigned long end,
unsigned long *src,
unsigned long *dst,
void *private)
{
return -EINVAL;
}
#endif /* IS_ENABLED(CONFIG_MIGRATE_VMA_HELPER) */
#endif /* CONFIG_MIGRATION */