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x86: Use absent_pages_in_range() instead of memblock_x86_hole_size() 

memblock_x86_hole_size() calculates the total size of holes in a given
range according to memblock and is used by numa emulation code and
numa_meminfo_cover_memory().

Since conversion to MEMBLOCK_NODE_MAP, absent_pages_in_range() also
uses memblock and gives the same result.  This patch replaces
memblock_x86_hole_size() uses with absent_pages_in_range().  After the
conversion the x86 function doesn't have any user left and is killed.

Signed-off-by: Tejun Heo <tj@kernel.org>
Link: http://lkml.kernel.org/r/1310462166-31469-12-git-send-email-tj@kernel.org
Cc: Yinghai Lu <yinghai@kernel.org>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
This commit is contained in:
Tejun Heo 2011-07-12 11:16:04 +02:00 committed by H. Peter Anvin
parent 6b5d41a1b9
commit 474b881bf4
4 changed files with 20 additions and 68 deletions
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2
arch/x86/include/asm/memblock.h
View File

@ -6,6 +6,4 @@
void memblock_x86_reserve_range(u64 start, u64 end, char *name);
void memblock_x86_free_range(u64 start, u64 end);
u64 memblock_x86_hole_size(u64 start, u64 end);
#endif

52
arch/x86/mm/memblock.c
View File

@ -32,55 +32,3 @@ void __init memblock_x86_free_range(u64 start, u64 end)
memblock_free(start, end - start);
}
/*
* Finds an active region in the address range from start_pfn to last_pfn and
* returns its range in ei_startpfn and ei_endpfn for the memblock entry.
*/
static int __init memblock_x86_find_active_region(const struct memblock_region *ei,
unsigned long start_pfn,
unsigned long last_pfn,
unsigned long *ei_startpfn,
unsigned long *ei_endpfn)
{
u64 align = PAGE_SIZE;
*ei_startpfn = round_up(ei->base, align) >> PAGE_SHIFT;
*ei_endpfn = round_down(ei->base + ei->size, align) >> PAGE_SHIFT;
/* Skip map entries smaller than a page */
if (*ei_startpfn >= *ei_endpfn)
return 0;
/* Skip if map is outside the node */
if (*ei_endpfn <= start_pfn || *ei_startpfn >= last_pfn)
return 0;
/* Check for overlaps */
if (*ei_startpfn < start_pfn)
*ei_startpfn = start_pfn;
if (*ei_endpfn > last_pfn)
*ei_endpfn = last_pfn;
return 1;
}
/*
* Find the hole size (in bytes) in the memory range.
* @start: starting address of the memory range to scan
* @end: ending address of the memory range to scan
*/
u64 __init memblock_x86_hole_size(u64 start, u64 end)
{
unsigned long start_pfn = start >> PAGE_SHIFT;
unsigned long last_pfn = end >> PAGE_SHIFT;
unsigned long ei_startpfn, ei_endpfn, ram = 0;
struct memblock_region *r;
for_each_memblock(memory, r)
if (memblock_x86_find_active_region(r, start_pfn, last_pfn,
&ei_startpfn, &ei_endpfn))
ram += ei_endpfn - ei_startpfn;
return end - start - ((u64)ram << PAGE_SHIFT);
}

4
arch/x86/mm/numa.c
View File

@ -475,8 +475,8 @@ static bool __init numa_meminfo_cover_memory(const struct numa_meminfo *mi)
numaram = 0;
}
e820ram = max_pfn - (memblock_x86_hole_size(0,
PFN_PHYS(max_pfn)) >> PAGE_SHIFT);
e820ram = max_pfn - absent_pages_in_range(0, max_pfn);
/* We seem to lose 3 pages somewhere. Allow 1M of slack. */
if ((s64)(e820ram - numaram) >= (1 << (20 - PAGE_SHIFT))) {
printk(KERN_ERR "NUMA: nodes only cover %LuMB of your %LuMB e820 RAM. Not used.\n",

30
arch/x86/mm/numa_emulation.c
View File

@ -28,6 +28,16 @@ static int __init emu_find_memblk_by_nid(int nid, const struct numa_meminfo *mi)
return -ENOENT;
}
static u64 mem_hole_size(u64 start, u64 end)
{
unsigned long start_pfn = PFN_UP(start);
unsigned long end_pfn = PFN_DOWN(end);
if (start_pfn < end_pfn)
return PFN_PHYS(absent_pages_in_range(start_pfn, end_pfn));
return 0;
}
/*
* Sets up nid to range from @start to @end. The return value is -errno if
* something went wrong, 0 otherwise.
@ -89,7 +99,7 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
* Calculate target node size. x86_32 freaks on __udivdi3() so do
* the division in ulong number of pages and convert back.
*/
size = max_addr - addr - memblock_x86_hole_size(addr, max_addr);
size = max_addr - addr - mem_hole_size(addr, max_addr);
size = PFN_PHYS((unsigned long)(size >> PAGE_SHIFT) / nr_nodes);
/*
@ -135,8 +145,7 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
* Continue to add memory to this fake node if its
* non-reserved memory is less than the per-node size.
*/
while (end - start -
memblock_x86_hole_size(start, end) < size) {
while (end - start - mem_hole_size(start, end) < size) {
end += FAKE_NODE_MIN_SIZE;
if (end > limit) {
end = limit;
@ -150,7 +159,7 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
* this one must extend to the boundary.
*/
if (end < dma32_end && dma32_end - end -
memblock_x86_hole_size(end, dma32_end) < FAKE_NODE_MIN_SIZE)
mem_hole_size(end, dma32_end) < FAKE_NODE_MIN_SIZE)
end = dma32_end;
/*
@ -158,8 +167,7 @@ static int __init split_nodes_interleave(struct numa_meminfo *ei,
* next node, this one must extend to the end of the
* physical node.
*/
if (limit - end -
memblock_x86_hole_size(end, limit) < size)
if (limit - end - mem_hole_size(end, limit) < size)
end = limit;
ret = emu_setup_memblk(ei, pi, nid++ % nr_nodes,
@ -180,7 +188,7 @@ static u64 __init find_end_of_node(u64 start, u64 max_addr, u64 size)
{
u64 end = start + size;
while (end - start - memblock_x86_hole_size(start, end) < size) {
while (end - start - mem_hole_size(start, end) < size) {
end += FAKE_NODE_MIN_SIZE;
if (end > max_addr) {
end = max_addr;
@ -211,8 +219,7 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
* creates a uniform distribution of node sizes across the entire
* machine (but not necessarily over physical nodes).
*/
min_size = (max_addr - addr - memblock_x86_hole_size(addr, max_addr)) /
MAX_NUMNODES;
min_size = (max_addr - addr - mem_hole_size(addr, max_addr)) / MAX_NUMNODES;
min_size = max(min_size, FAKE_NODE_MIN_SIZE);
if ((min_size & FAKE_NODE_MIN_HASH_MASK) < min_size)
min_size = (min_size + FAKE_NODE_MIN_SIZE) &
@ -252,7 +259,7 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
* this one must extend to the boundary.
*/
if (end < dma32_end && dma32_end - end -
memblock_x86_hole_size(end, dma32_end) < FAKE_NODE_MIN_SIZE)
mem_hole_size(end, dma32_end) < FAKE_NODE_MIN_SIZE)
end = dma32_end;
/*
@ -260,8 +267,7 @@ static int __init split_nodes_size_interleave(struct numa_meminfo *ei,
* next node, this one must extend to the end of the
* physical node.
*/
if (limit - end -
memblock_x86_hole_size(end, limit) < size)
if (limit - end - mem_hole_size(end, limit) < size)
end = limit;
ret = emu_setup_memblk(ei, pi, nid++ % MAX_NUMNODES,