| Message ID | 20200220043316.19668-7-bhe@redhat.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | mm/hotplug: Only use subsection map in VMEMMAP case | expand |
On Thu, Feb 20, 2020 at 12:33:15PM +0800, Baoquan He wrote: >No functional change. > Those functions are introduced in your previous patches. Is it possible to define them close to each other at the very beginning? >Signed-off-by: Baoquan He <bhe@redhat.com> >--- > mm/sparse.c | 172 +++++++++++++++++++++++++--------------------------- > 1 file changed, 84 insertions(+), 88 deletions(-) > >diff --git a/mm/sparse.c b/mm/sparse.c >index 14bff0b44e7c..053d6c2e5c1f 100644 >--- a/mm/sparse.c >+++ b/mm/sparse.c >@@ -244,10 +244,94 @@ void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages) > nr_pages -= pfns; > } > } >+ >+/** >+ * clear_subsection_map - Clear subsection map of one memory region >+ * >+ * @pfn - start pfn of the memory range >+ * @nr_pages - number of pfns to add in the region >+ * >+ * This is only intended for hotplug, and clear the related subsection >+ * map inside one section. >+ * >+ * Return: >+ * * -EINVAL - Section already deactived. >+ * * 0 - Subsection map is emptied. >+ * * 1 - Subsection map is not empty. >+ */ >+static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) >+{ >+ DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; >+ DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 }; >+ struct mem_section *ms = __pfn_to_section(pfn); >+ unsigned long *subsection_map = ms->usage >+ ? &ms->usage->subsection_map[0] : NULL; >+ >+ subsection_mask_set(map, pfn, nr_pages); >+ if (subsection_map) >+ bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION); >+ >+ if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION), >+ "section already deactivated (%#lx + %ld)\n", >+ pfn, nr_pages)) >+ return -EINVAL; >+ >+ bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); >+ >+ if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) >+ return 0; >+ >+ return 1; >+} >+ >+/** >+ * fill_subsection_map - fill subsection map of a memory region >+ * @pfn - start pfn of the memory range >+ * @nr_pages - number of pfns to add in the region >+ * >+ * This fills the related subsection map inside one section, and only >+ * intended for hotplug. >+ * >+ * Return: >+ * * 0 - On success. >+ * * -EINVAL - Invalid memory region. >+ * * -EEXIST - Subsection map has been set. >+ */ >+static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) >+{ >+ struct mem_section *ms = __pfn_to_section(pfn); >+ DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; >+ unsigned long *subsection_map; >+ int rc = 0; >+ >+ subsection_mask_set(map, pfn, nr_pages); >+ >+ subsection_map = &ms->usage->subsection_map[0]; >+ >+ if (bitmap_empty(map, SUBSECTIONS_PER_SECTION)) >+ rc = -EINVAL; >+ else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION)) >+ rc = -EEXIST; >+ else >+ bitmap_or(subsection_map, map, subsection_map, >+ SUBSECTIONS_PER_SECTION); >+ >+ return rc; >+} > #else > void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages) > { > } >+ >+static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) >+{ >+ return 0; >+} >+ >+static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) >+{ >+ return 0; >+} > #endif > > /* Record a memory area against a node. */ >@@ -732,52 +816,6 @@ static void free_map_bootmem(struct page *memmap) > } > #endif /* CONFIG_SPARSEMEM_VMEMMAP */ > >-#ifdef CONFIG_SPARSEMEM_VMEMMAP >-/** >- * clear_subsection_map - Clear subsection map of one memory region >- * >- * @pfn - start pfn of the memory range >- * @nr_pages - number of pfns to add in the region >- * >- * This is only intended for hotplug, and clear the related subsection >- * map inside one section. >- * >- * Return: >- * * -EINVAL - Section already deactived. >- * * 0 - Subsection map is emptied. >- * * 1 - Subsection map is not empty. >- */ >-static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) >-{ >- DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; >- DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 }; >- struct mem_section *ms = __pfn_to_section(pfn); >- unsigned long *subsection_map = ms->usage >- ? &ms->usage->subsection_map[0] : NULL; >- >- subsection_mask_set(map, pfn, nr_pages); >- if (subsection_map) >- bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION); >- >- if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION), >- "section already deactivated (%#lx + %ld)\n", >- pfn, nr_pages)) >- return -EINVAL; >- >- bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); >- >- if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) >- return 0; >- >- return 1; >-} >-#else >-static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) >-{ >- return 0; >-} >-#endif >- > /* > * To deactivate a memory region, there are 3 cases to handle across > * two configurations (SPARSEMEM_VMEMMAP={y,n}): >@@ -833,48 +871,6 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, > ms->section_mem_map = (unsigned long)NULL; > } > >-#ifdef CONFIG_SPARSEMEM_VMEMMAP >-/** >- * fill_subsection_map - fill subsection map of a memory region >- * @pfn - start pfn of the memory range >- * @nr_pages - number of pfns to add in the region >- * >- * This fills the related subsection map inside one section, and only >- * intended for hotplug. >- * >- * Return: >- * * 0 - On success. >- * * -EINVAL - Invalid memory region. >- * * -EEXIST - Subsection map has been set. >- */ >-static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) >-{ >- struct mem_section *ms = __pfn_to_section(pfn); >- DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; >- unsigned long *subsection_map; >- int rc = 0; >- >- subsection_mask_set(map, pfn, nr_pages); >- >- subsection_map = &ms->usage->subsection_map[0]; >- >- if (bitmap_empty(map, SUBSECTIONS_PER_SECTION)) >- rc = -EINVAL; >- else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION)) >- rc = -EEXIST; >- else >- bitmap_or(subsection_map, map, subsection_map, >- SUBSECTIONS_PER_SECTION); >- >- return rc; >-} >-#else >-static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) >-{ >- return 0; >-} >-#endif >- > static struct page * __meminit section_activate(int nid, unsigned long pfn, > unsigned long nr_pages, struct vmem_altmap *altmap) > { >-- >2.17.2
On 02/20/20 at 02:18pm, Wei Yang wrote: > On Thu, Feb 20, 2020 at 12:33:15PM +0800, Baoquan He wrote: > >No functional change. > > > > Those functions are introduced in your previous patches. > > Is it possible to define them close to each other at the very beginning? Thanks for reviewing. Do you mean to discard this patch and keep it as they are in the patch 4/7? If yes, it's fine to me to drop it as you suggested. To me, I prefer to put all subsection map handling codes together. > > >Signed-off-by: Baoquan He <bhe@redhat.com> > >--- > > mm/sparse.c | 172 +++++++++++++++++++++++++--------------------------- > > 1 file changed, 84 insertions(+), 88 deletions(-) > > > >diff --git a/mm/sparse.c b/mm/sparse.c > >index 14bff0b44e7c..053d6c2e5c1f 100644 > >--- a/mm/sparse.c > >+++ b/mm/sparse.c > >@@ -244,10 +244,94 @@ void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages) > > nr_pages -= pfns; > > } > > } > >+ > >+/** > >+ * clear_subsection_map - Clear subsection map of one memory region > >+ * > >+ * @pfn - start pfn of the memory range > >+ * @nr_pages - number of pfns to add in the region > >+ * > >+ * This is only intended for hotplug, and clear the related subsection > >+ * map inside one section. > >+ * > >+ * Return: > >+ * * -EINVAL - Section already deactived. > >+ * * 0 - Subsection map is emptied. > >+ * * 1 - Subsection map is not empty. > >+ */ > >+static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) > >+{ > >+ DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; > >+ DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 }; > >+ struct mem_section *ms = __pfn_to_section(pfn); > >+ unsigned long *subsection_map = ms->usage > >+ ? &ms->usage->subsection_map[0] : NULL; > >+ > >+ subsection_mask_set(map, pfn, nr_pages); > >+ if (subsection_map) > >+ bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION); > >+ > >+ if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION), > >+ "section already deactivated (%#lx + %ld)\n", > >+ pfn, nr_pages)) > >+ return -EINVAL; > >+ > >+ bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); > >+ > >+ if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) > >+ return 0; > >+ > >+ return 1; > >+} > >+ > >+/** > >+ * fill_subsection_map - fill subsection map of a memory region > >+ * @pfn - start pfn of the memory range > >+ * @nr_pages - number of pfns to add in the region > >+ * > >+ * This fills the related subsection map inside one section, and only > >+ * intended for hotplug. > >+ * > >+ * Return: > >+ * * 0 - On success. > >+ * * -EINVAL - Invalid memory region. > >+ * * -EEXIST - Subsection map has been set. > >+ */ > >+static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) > >+{ > >+ struct mem_section *ms = __pfn_to_section(pfn); > >+ DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; > >+ unsigned long *subsection_map; > >+ int rc = 0; > >+ > >+ subsection_mask_set(map, pfn, nr_pages); > >+ > >+ subsection_map = &ms->usage->subsection_map[0]; > >+ > >+ if (bitmap_empty(map, SUBSECTIONS_PER_SECTION)) > >+ rc = -EINVAL; > >+ else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION)) > >+ rc = -EEXIST; > >+ else > >+ bitmap_or(subsection_map, map, subsection_map, > >+ SUBSECTIONS_PER_SECTION); > >+ > >+ return rc; > >+} > > #else > > void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages) > > { > > } > >+ > >+static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) > >+{ > >+ return 0; > >+} > >+ > >+static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) > >+{ > >+ return 0; > >+} > > #endif > > > > /* Record a memory area against a node. */ > >@@ -732,52 +816,6 @@ static void free_map_bootmem(struct page *memmap) > > } > > #endif /* CONFIG_SPARSEMEM_VMEMMAP */ > > > >-#ifdef CONFIG_SPARSEMEM_VMEMMAP > >-/** > >- * clear_subsection_map - Clear subsection map of one memory region > >- * > >- * @pfn - start pfn of the memory range > >- * @nr_pages - number of pfns to add in the region > >- * > >- * This is only intended for hotplug, and clear the related subsection > >- * map inside one section. > >- * > >- * Return: > >- * * -EINVAL - Section already deactived. > >- * * 0 - Subsection map is emptied. > >- * * 1 - Subsection map is not empty. > >- */ > >-static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) > >-{ > >- DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; > >- DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 }; > >- struct mem_section *ms = __pfn_to_section(pfn); > >- unsigned long *subsection_map = ms->usage > >- ? &ms->usage->subsection_map[0] : NULL; > >- > >- subsection_mask_set(map, pfn, nr_pages); > >- if (subsection_map) > >- bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION); > >- > >- if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION), > >- "section already deactivated (%#lx + %ld)\n", > >- pfn, nr_pages)) > >- return -EINVAL; > >- > >- bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); > >- > >- if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) > >- return 0; > >- > >- return 1; > >-} > >-#else > >-static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) > >-{ > >- return 0; > >-} > >-#endif > >- > > /* > > * To deactivate a memory region, there are 3 cases to handle across > > * two configurations (SPARSEMEM_VMEMMAP={y,n}): > >@@ -833,48 +871,6 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, > > ms->section_mem_map = (unsigned long)NULL; > > } > > > >-#ifdef CONFIG_SPARSEMEM_VMEMMAP > >-/** > >- * fill_subsection_map - fill subsection map of a memory region > >- * @pfn - start pfn of the memory range > >- * @nr_pages - number of pfns to add in the region > >- * > >- * This fills the related subsection map inside one section, and only > >- * intended for hotplug. > >- * > >- * Return: > >- * * 0 - On success. > >- * * -EINVAL - Invalid memory region. > >- * * -EEXIST - Subsection map has been set. > >- */ > >-static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) > >-{ > >- struct mem_section *ms = __pfn_to_section(pfn); > >- DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; > >- unsigned long *subsection_map; > >- int rc = 0; > >- > >- subsection_mask_set(map, pfn, nr_pages); > >- > >- subsection_map = &ms->usage->subsection_map[0]; > >- > >- if (bitmap_empty(map, SUBSECTIONS_PER_SECTION)) > >- rc = -EINVAL; > >- else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION)) > >- rc = -EEXIST; > >- else > >- bitmap_or(subsection_map, map, subsection_map, > >- SUBSECTIONS_PER_SECTION); > >- > >- return rc; > >-} > >-#else > >-static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) > >-{ > >- return 0; > >-} > >-#endif > >- > > static struct page * __meminit section_activate(int nid, unsigned long pfn, > > unsigned long nr_pages, struct vmem_altmap *altmap) > > { > >-- > >2.17.2 > > -- > Wei Yang > Help you, Help me >
On Thu, Feb 20, 2020 at 03:04:20PM +0800, Baoquan He wrote: >On 02/20/20 at 02:18pm, Wei Yang wrote: >> On Thu, Feb 20, 2020 at 12:33:15PM +0800, Baoquan He wrote: >> >No functional change. >> > >> >> Those functions are introduced in your previous patches. >> >> Is it possible to define them close to each other at the very beginning? > >Thanks for reviewing. > >Do you mean to discard this patch and keep it as they are in the patch 4/7? >If yes, it's fine to me to drop it as you suggested. To me, I prefer to put >all subsection map handling codes together. > I mean when you introduce clear_subsection_map() in patch 3, is it possible to move close to the definition of fill_subsection_map()? Since finally you are will to move them together.
On 02/20/20 at 03:12pm, Wei Yang wrote: > On Thu, Feb 20, 2020 at 03:04:20PM +0800, Baoquan He wrote: > >On 02/20/20 at 02:18pm, Wei Yang wrote: > >> On Thu, Feb 20, 2020 at 12:33:15PM +0800, Baoquan He wrote: > >> >No functional change. > >> > > >> > >> Those functions are introduced in your previous patches. > >> > >> Is it possible to define them close to each other at the very beginning? > > > >Thanks for reviewing. > > > >Do you mean to discard this patch and keep it as they are in the patch 4/7? > >If yes, it's fine to me to drop it as you suggested. To me, I prefer to put > >all subsection map handling codes together. > > > > I mean when you introduce clear_subsection_map() in patch 3, is it possible to > move close to the definition of fill_subsection_map()? > > Since finally you are will to move them together. Oh, got it. Yeah, I just put them close to their callers separately. I think it's also good to put them together as you suggested, but it doesn't matter much, right? I will consider this and see if I can adjust it if v3 is needed. Thanks.
On Thu, Feb 20, 2020 at 04:55:59PM +0800, Baoquan He wrote: >On 02/20/20 at 03:12pm, Wei Yang wrote: >> On Thu, Feb 20, 2020 at 03:04:20PM +0800, Baoquan He wrote: >> >On 02/20/20 at 02:18pm, Wei Yang wrote: >> >> On Thu, Feb 20, 2020 at 12:33:15PM +0800, Baoquan He wrote: >> >> >No functional change. >> >> > >> >> >> >> Those functions are introduced in your previous patches. >> >> >> >> Is it possible to define them close to each other at the very beginning? >> > >> >Thanks for reviewing. >> > >> >Do you mean to discard this patch and keep it as they are in the patch 4/7? >> >If yes, it's fine to me to drop it as you suggested. To me, I prefer to put >> >all subsection map handling codes together. >> > >> >> I mean when you introduce clear_subsection_map() in patch 3, is it possible to >> move close to the definition of fill_subsection_map()? >> >> Since finally you are will to move them together. > >Oh, got it. Yeah, I just put them close to their callers separately. I >think it's also good to put them together as you suggested, but it >doesn't matter much, right? I will consider this and see if I can adjust >it if v3 is needed. Thanks. Yes, doesn't matter much.
diff --git a/mm/sparse.c b/mm/sparse.c index 14bff0b44e7c..053d6c2e5c1f 100644 --- a/mm/sparse.c +++ b/mm/sparse.c @@ -244,10 +244,94 @@ void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages) nr_pages -= pfns; } } + +/** + * clear_subsection_map - Clear subsection map of one memory region + * + * @pfn - start pfn of the memory range + * @nr_pages - number of pfns to add in the region + * + * This is only intended for hotplug, and clear the related subsection + * map inside one section. + * + * Return: + * * -EINVAL - Section already deactived. + * * 0 - Subsection map is emptied. + * * 1 - Subsection map is not empty. + */ +static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) +{ + DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; + DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 }; + struct mem_section *ms = __pfn_to_section(pfn); + unsigned long *subsection_map = ms->usage + ? &ms->usage->subsection_map[0] : NULL; + + subsection_mask_set(map, pfn, nr_pages); + if (subsection_map) + bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION); + + if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION), + "section already deactivated (%#lx + %ld)\n", + pfn, nr_pages)) + return -EINVAL; + + bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); + + if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) + return 0; + + return 1; +} + +/** + * fill_subsection_map - fill subsection map of a memory region + * @pfn - start pfn of the memory range + * @nr_pages - number of pfns to add in the region + * + * This fills the related subsection map inside one section, and only + * intended for hotplug. + * + * Return: + * * 0 - On success. + * * -EINVAL - Invalid memory region. + * * -EEXIST - Subsection map has been set. + */ +static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) +{ + struct mem_section *ms = __pfn_to_section(pfn); + DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; + unsigned long *subsection_map; + int rc = 0; + + subsection_mask_set(map, pfn, nr_pages); + + subsection_map = &ms->usage->subsection_map[0]; + + if (bitmap_empty(map, SUBSECTIONS_PER_SECTION)) + rc = -EINVAL; + else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION)) + rc = -EEXIST; + else + bitmap_or(subsection_map, map, subsection_map, + SUBSECTIONS_PER_SECTION); + + return rc; +} #else void __init subsection_map_init(unsigned long pfn, unsigned long nr_pages) { } + +static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) +{ + return 0; +} + +static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) +{ + return 0; +} #endif /* Record a memory area against a node. */ @@ -732,52 +816,6 @@ static void free_map_bootmem(struct page *memmap) } #endif /* CONFIG_SPARSEMEM_VMEMMAP */ -#ifdef CONFIG_SPARSEMEM_VMEMMAP -/** - * clear_subsection_map - Clear subsection map of one memory region - * - * @pfn - start pfn of the memory range - * @nr_pages - number of pfns to add in the region - * - * This is only intended for hotplug, and clear the related subsection - * map inside one section. - * - * Return: - * * -EINVAL - Section already deactived. - * * 0 - Subsection map is emptied. - * * 1 - Subsection map is not empty. - */ -static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) -{ - DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; - DECLARE_BITMAP(tmp, SUBSECTIONS_PER_SECTION) = { 0 }; - struct mem_section *ms = __pfn_to_section(pfn); - unsigned long *subsection_map = ms->usage - ? &ms->usage->subsection_map[0] : NULL; - - subsection_mask_set(map, pfn, nr_pages); - if (subsection_map) - bitmap_and(tmp, map, subsection_map, SUBSECTIONS_PER_SECTION); - - if (WARN(!subsection_map || !bitmap_equal(tmp, map, SUBSECTIONS_PER_SECTION), - "section already deactivated (%#lx + %ld)\n", - pfn, nr_pages)) - return -EINVAL; - - bitmap_xor(subsection_map, map, subsection_map, SUBSECTIONS_PER_SECTION); - - if (bitmap_empty(subsection_map, SUBSECTIONS_PER_SECTION)) - return 0; - - return 1; -} -#else -static int clear_subsection_map(unsigned long pfn, unsigned long nr_pages) -{ - return 0; -} -#endif - /* * To deactivate a memory region, there are 3 cases to handle across * two configurations (SPARSEMEM_VMEMMAP={y,n}): @@ -833,48 +871,6 @@ static void section_deactivate(unsigned long pfn, unsigned long nr_pages, ms->section_mem_map = (unsigned long)NULL; } -#ifdef CONFIG_SPARSEMEM_VMEMMAP -/** - * fill_subsection_map - fill subsection map of a memory region - * @pfn - start pfn of the memory range - * @nr_pages - number of pfns to add in the region - * - * This fills the related subsection map inside one section, and only - * intended for hotplug. - * - * Return: - * * 0 - On success. - * * -EINVAL - Invalid memory region. - * * -EEXIST - Subsection map has been set. - */ -static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) -{ - struct mem_section *ms = __pfn_to_section(pfn); - DECLARE_BITMAP(map, SUBSECTIONS_PER_SECTION) = { 0 }; - unsigned long *subsection_map; - int rc = 0; - - subsection_mask_set(map, pfn, nr_pages); - - subsection_map = &ms->usage->subsection_map[0]; - - if (bitmap_empty(map, SUBSECTIONS_PER_SECTION)) - rc = -EINVAL; - else if (bitmap_intersects(map, subsection_map, SUBSECTIONS_PER_SECTION)) - rc = -EEXIST; - else - bitmap_or(subsection_map, map, subsection_map, - SUBSECTIONS_PER_SECTION); - - return rc; -} -#else -static int fill_subsection_map(unsigned long pfn, unsigned long nr_pages) -{ - return 0; -} -#endif - static struct page * __meminit section_activate(int nid, unsigned long pfn, unsigned long nr_pages, struct vmem_altmap *altmap) {
No functional change. Signed-off-by: Baoquan He <bhe@redhat.com> --- mm/sparse.c | 172 +++++++++++++++++++++++++--------------------------- 1 file changed, 84 insertions(+), 88 deletions(-)