[PATCH 09/17] mm: split altmap memory map allocation from normal case

Christoph Hellwig
2017-12-29T07:50:02Z

No functional changes, just untangling the call chain and document
why the altmap is passed around the hotplug code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
Reviewed-by: Dan Williams <dan.j.williams@intel.com>
---
arch/powerpc/mm/init_64.c | 5 ++++-
arch/x86/mm/init_64.c | 5 ++++-
include/linux/mm.h | 9 ++-------
mm/sparse-vmemmap.c | 15 +++------------
4 files changed, 13 insertions(+), 21 deletions(-)

diff --git a/arch/powerpc/mm/init_64.c b/arch/powerpc/mm/init_64.c
index db7d4e092157..7a2251d99ed3 100644
--- a/arch/powerpc/mm/init_64.c
+++ b/arch/powerpc/mm/init_64.c
@@ -200,7 +200,10 @@ int __meminit vmemmap_populate(unsigned long start, unsigned long end, int node,
if (vmemmap_populated(start, page_size))
continue;

- p = __vmemmap_alloc_block_buf(page_size, node, altmap);
+ if (altmap)
+ p = altmap_alloc_block_buf(page_size, altmap);
+ else
+ p = vmemmap_alloc_block_buf(page_size, node);
if (!p)
return -ENOMEM;

diff --git a/arch/x86/mm/init_64.c b/arch/x86/mm/init_64.c
index 0cab4b5b59ba..1ab42c852069 100644
--- a/arch/x86/mm/init_64.c
+++ b/arch/x86/mm/init_64.c
@@ -1385,7 +1385,10 @@ static int __meminit vmemmap_populate_hugepages(unsigned long start,
if (pmd_none(*pmd)) {
void *p;

- p = __vmemmap_alloc_block_buf(PMD_SIZE, node, altmap);
+ if (altmap)
+ p = altmap_alloc_block_buf(PMD_SIZE, altmap);
+ else
+ p = vmemmap_alloc_block_buf(PMD_SIZE, node);
if (p) {
pte_t entry;

diff --git a/include/linux/mm.h b/include/linux/mm.h
index fd01135324b6..09637c353de0 100644
--- a/include/linux/mm.h
+++ b/include/linux/mm.h
@@ -2547,13 +2547,8 @@ pmd_t *vmemmap_pmd_populate(pud_t *pud, unsigned long addr, int node);
pte_t *vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node);
void *vmemmap_alloc_block(unsigned long size, int node);
struct vmem_altmap;
-void *__vmemmap_alloc_block_buf(unsigned long size, int node,
- struct vmem_altmap *altmap);
-static inline void *vmemmap_alloc_block_buf(unsigned long size, int node)
-{
- return __vmemmap_alloc_block_buf(size, node, NULL);
-}
-
+void *vmemmap_alloc_block_buf(unsigned long size, int node);
+void *altmap_alloc_block_buf(unsigned long size, struct vmem_altmap *altmap);
void vmemmap_verify(pte_t *, int, unsigned long, unsigned long);
int vmemmap_populate_basepages(unsigned long start, unsigned long end,
int node);
diff --git a/mm/sparse-vmemmap.c b/mm/sparse-vmemmap.c
index 376dcf05a39c..d012c9e2811b 100644
--- a/mm/sparse-vmemmap.c
+++ b/mm/sparse-vmemmap.c
@@ -74,7 +74,7 @@ void * __meminit vmemmap_alloc_block(unsigned long size, int node)
}

/* need to make sure size is all the same during early stage */
-static void * __meminit alloc_block_buf(unsigned long size, int node)
+void * __meminit vmemmap_alloc_block_buf(unsigned long size, int node)
{
void *ptr;

@@ -129,7 +129,7 @@ static unsigned long __meminit vmem_altmap_alloc(struct vmem_altmap *altmap,
return pfn + nr_align;
}

-static void * __meminit altmap_alloc_block_buf(unsigned long size,
+void * __meminit altmap_alloc_block_buf(unsigned long size,
struct vmem_altmap *altmap)
{
unsigned long pfn, nr_pfns;
@@ -153,15 +153,6 @@ static void * __meminit altmap_alloc_block_buf(unsigned long size,
return ptr;
}

-/* need to make sure size is all the same during early stage */
-void * __meminit __vmemmap_alloc_block_buf(unsigned long size, int node,
- struct vmem_altmap *altmap)
-{
- if (altmap)
- return altmap_alloc_block_buf(size, altmap);
- return alloc_block_buf(size, node);
-}
-
void __meminit vmemmap_verify(pte_t *pte, int node,
unsigned long start, unsigned long end)
{
@@ -178,7 +169,7 @@ pte_t * __meminit vmemmap_pte_populate(pmd_t *pmd, unsigned long addr, int node)
pte_t *pte = pte_offset_kernel(pmd, addr);
if (pte_none(*pte)) {
pte_t entry;
- void *p = alloc_block_buf(PAGE_SIZE, node);
+ void *p = vmemmap_alloc_block_buf(PAGE_SIZE, node);
if (!p)
return NULL;
entry = pfn_pte(__pa(p) >> PAGE_SHIFT, PAGE_KERNEL);