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authorMike Rapoport <rppt@linux.ibm.com>2020-06-04 00:56:53 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2020-06-04 05:09:43 +0200
commitd622abf74f3d81365e41c3bfdbbda50ecd99ba3d (patch)
tree5c40146a16390cb393c36a3c9ae2a50f5d5a4a89
parentmm: clarify __GFP_MEMALLOC usage (diff)
downloadlinux-d622abf74f3d81365e41c3bfdbbda50ecd99ba3d.tar.xz
linux-d622abf74f3d81365e41c3bfdbbda50ecd99ba3d.zip
mm: memblock: replace dereferences of memblock_region.nid with API calls
Patch series "mm: rework free_area_init*() funcitons". After the discussion [1] about removal of CONFIG_NODES_SPAN_OTHER_NODES and CONFIG_HAVE_MEMBLOCK_NODE_MAP options, I took it a bit further and updated the node/zone initialization. Since all architectures have memblock, it is possible to use only the newer version of free_area_init_node() that calculates the zone and node boundaries based on memblock node mapping and architectural limits on possible zone PFNs. The architectures that still determined zone and hole sizes can be switched to the generic code and the old code that took those zone and hole sizes can be simply removed. And, since it all started from the removal of CONFIG_NODES_SPAN_OTHER_NODES, the memmap_init() is now updated to iterate over memblocks and so it does not need to perform early_pfn_to_nid() query for every PFN. [1] https://lore.kernel.org/lkml/1585420282-25630-1-git-send-email-Hoan@os.amperecomputing.com This patch (of 21): There are several places in the code that directly dereference memblock_region.nid despite this field being defined only when CONFIG_HAVE_MEMBLOCK_NODE_MAP=y. Replace these with calls to memblock_get_region_nid() to improve code robustness and to avoid possible breakage when CONFIG_HAVE_MEMBLOCK_NODE_MAP will be removed. Signed-off-by: Mike Rapoport <rppt@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Tested-by: Hoan Tran <hoan@os.amperecomputing.com> [arm64] Reviewed-by: Baoquan He <bhe@redhat.com> Cc: Brian Cain <bcain@codeaurora.org> Cc: Catalin Marinas <catalin.marinas@arm.com> Cc: "David S. Miller" <davem@davemloft.net> Cc: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Greentime Hu <green.hu@gmail.com> Cc: Greg Ungerer <gerg@linux-m68k.org> Cc: Guan Xuetao <gxt@pku.edu.cn> Cc: Guo Ren <guoren@kernel.org> Cc: Heiko Carstens <heiko.carstens@de.ibm.com> Cc: Helge Deller <deller@gmx.de> Cc: "James E.J. Bottomley" <James.Bottomley@HansenPartnership.com> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Ley Foon Tan <ley.foon.tan@intel.com> Cc: Mark Salter <msalter@redhat.com> Cc: Matt Turner <mattst88@gmail.com> Cc: Max Filippov <jcmvbkbc@gmail.com> Cc: Michael Ellerman <mpe@ellerman.id.au> Cc: Michal Hocko <mhocko@kernel.org> Cc: Michal Simek <monstr@monstr.eu> Cc: Mike Rapoport <rppt@kernel.org> Cc: Nick Hu <nickhu@andestech.com> Cc: Paul Walmsley <paul.walmsley@sifive.com> Cc: Richard Weinberger <richard@nod.at> Cc: Rich Felker <dalias@libc.org> Cc: Russell King <linux@armlinux.org.uk> Cc: Stafford Horne <shorne@gmail.com> Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de> Cc: Tony Luck <tony.luck@intel.com> Cc: Vineet Gupta <vgupta@synopsys.com> Cc: Yoshinori Sato <ysato@users.sourceforge.jp> Link: http://lkml.kernel.org/r/20200412194859.12663-1-rppt@kernel.org Link: http://lkml.kernel.org/r/20200412194859.12663-2-rppt@kernel.org Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--arch/arm64/mm/numa.c9
-rw-r--r--arch/x86/mm/numa.c6
-rw-r--r--mm/memblock.c8
-rw-r--r--mm/page_alloc.c4
4 files changed, 17 insertions, 10 deletions
diff --git a/arch/arm64/mm/numa.c b/arch/arm64/mm/numa.c
index 4decf1659700..aafcee3e3f7e 100644
--- a/arch/arm64/mm/numa.c
+++ b/arch/arm64/mm/numa.c
@@ -350,13 +350,16 @@ static int __init numa_register_nodes(void)
struct memblock_region *mblk;
/* Check that valid nid is set to memblks */
- for_each_memblock(memory, mblk)
- if (mblk->nid == NUMA_NO_NODE || mblk->nid >= MAX_NUMNODES) {
+ for_each_memblock(memory, mblk) {
+ int mblk_nid = memblock_get_region_node(mblk);
+
+ if (mblk_nid == NUMA_NO_NODE || mblk_nid >= MAX_NUMNODES) {
pr_warn("Warning: invalid memblk node %d [mem %#010Lx-%#010Lx]\n",
- mblk->nid, mblk->base,
+ mblk_nid, mblk->base,
mblk->base + mblk->size - 1);
return -EINVAL;
}
+ }
/* Finally register nodes. */
for_each_node_mask(nid, numa_nodes_parsed) {
diff --git a/arch/x86/mm/numa.c b/arch/x86/mm/numa.c
index 59ba008504dc..fe024b2ac796 100644
--- a/arch/x86/mm/numa.c
+++ b/arch/x86/mm/numa.c
@@ -517,8 +517,10 @@ static void __init numa_clear_kernel_node_hotplug(void)
* reserve specific pages for Sandy Bridge graphics. ]
*/
for_each_memblock(reserved, mb_region) {
- if (mb_region->nid != MAX_NUMNODES)
- node_set(mb_region->nid, reserved_nodemask);
+ int nid = memblock_get_region_node(mb_region);
+
+ if (nid != MAX_NUMNODES)
+ node_set(nid, reserved_nodemask);
}
/*
diff --git a/mm/memblock.c b/mm/memblock.c
index c79ba6f9920c..43e2fd3006c1 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1207,13 +1207,15 @@ void __init_memblock __next_mem_pfn_range(int *idx, int nid,
{
struct memblock_type *type = &memblock.memory;
struct memblock_region *r;
+ int r_nid;
while (++*idx < type->cnt) {
r = &type->regions[*idx];
+ r_nid = memblock_get_region_node(r);
if (PFN_UP(r->base) >= PFN_DOWN(r->base + r->size))
continue;
- if (nid == MAX_NUMNODES || nid == r->nid)
+ if (nid == MAX_NUMNODES || nid == r_nid)
break;
}
if (*idx >= type->cnt) {
@@ -1226,7 +1228,7 @@ void __init_memblock __next_mem_pfn_range(int *idx, int nid,
if (out_end_pfn)
*out_end_pfn = PFN_DOWN(r->base + r->size);
if (out_nid)
- *out_nid = r->nid;
+ *out_nid = r_nid;
}
/**
@@ -1810,7 +1812,7 @@ int __init_memblock memblock_search_pfn_nid(unsigned long pfn,
*start_pfn = PFN_DOWN(type->regions[mid].base);
*end_pfn = PFN_DOWN(type->regions[mid].base + type->regions[mid].size);
- return type->regions[mid].nid;
+ return memblock_get_region_node(&type->regions[mid]);
}
#endif
diff --git a/mm/page_alloc.c b/mm/page_alloc.c
index ca864102bebe..511602288e2d 100644
--- a/mm/page_alloc.c
+++ b/mm/page_alloc.c
@@ -7220,7 +7220,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
if (!memblock_is_hotpluggable(r))
continue;
- nid = r->nid;
+ nid = memblock_get_region_node(r);
usable_startpfn = PFN_DOWN(r->base);
zone_movable_pfn[nid] = zone_movable_pfn[nid] ?
@@ -7241,7 +7241,7 @@ static void __init find_zone_movable_pfns_for_nodes(void)
if (memblock_is_mirror(r))
continue;
- nid = r->nid;
+ nid = memblock_get_region_node(r);
usable_startpfn = memblock_region_memory_base_pfn(r);