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authorLaurent Dufour <ldufour@linux.ibm.com>2020-10-16 05:09:15 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2020-10-16 20:11:18 +0200
commit90c7eaeb14a325a760d732184ff1fbed47e5fa98 (patch)
tree9917d21e026e4fc1e01bb332fefca59fd44851d4 /drivers/base/node.c
parentkernel/resource: make iomem_resource implicit in release_mem_region_adjustable() (diff)
downloadlinux-90c7eaeb14a325a760d732184ff1fbed47e5fa98.tar.xz
linux-90c7eaeb14a325a760d732184ff1fbed47e5fa98.zip
mm: don't panic when links can't be created in sysfs
At boot time, or when doing memory hot-add operations, if the links in sysfs can't be created, the system is still able to run, so just report the error in the kernel log rather than BUG_ON and potentially make system unusable because the callpath can be called with locks held. Since the number of memory blocks managed could be high, the messages are rate limited. As a consequence, link_mem_sections() has no status to report anymore. Signed-off-by: Laurent Dufour <ldufour@linux.ibm.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Reviewed-by: Oscar Salvador <osalvador@suse.de> Acked-by: Michal Hocko <mhocko@suse.com> Acked-by: David Hildenbrand <david@redhat.com> Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: Nathan Lynch <nathanl@linux.ibm.com> Cc: "Rafael J . Wysocki" <rafael@kernel.org> Cc: Scott Cheloha <cheloha@linux.ibm.com> Cc: Tony Luck <tony.luck@intel.com> Link: https://lkml.kernel.org/r/20200915094143.79181-4-ldufour@linux.ibm.com Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'drivers/base/node.c')
-rw-r--r--drivers/base/node.c33
1 files changed, 21 insertions, 12 deletions
diff --git a/drivers/base/node.c b/drivers/base/node.c
index 43d21f9e88b1..6ffa470e2984 100644
--- a/drivers/base/node.c
+++ b/drivers/base/node.c
@@ -772,8 +772,8 @@ static int __ref get_nid_for_pfn(unsigned long pfn)
return pfn_to_nid(pfn);
}
-static int do_register_memory_block_under_node(int nid,
- struct memory_block *mem_blk)
+static void do_register_memory_block_under_node(int nid,
+ struct memory_block *mem_blk)
{
int ret;
@@ -786,12 +786,19 @@ static int do_register_memory_block_under_node(int nid,
ret = sysfs_create_link_nowarn(&node_devices[nid]->dev.kobj,
&mem_blk->dev.kobj,
kobject_name(&mem_blk->dev.kobj));
- if (ret)
- return ret;
+ if (ret && ret != -EEXIST)
+ dev_err_ratelimited(&node_devices[nid]->dev,
+ "can't create link to %s in sysfs (%d)\n",
+ kobject_name(&mem_blk->dev.kobj), ret);
- return sysfs_create_link_nowarn(&mem_blk->dev.kobj,
+ ret = sysfs_create_link_nowarn(&mem_blk->dev.kobj,
&node_devices[nid]->dev.kobj,
kobject_name(&node_devices[nid]->dev.kobj));
+ if (ret && ret != -EEXIST)
+ dev_err_ratelimited(&mem_blk->dev,
+ "can't create link to %s in sysfs (%d)\n",
+ kobject_name(&node_devices[nid]->dev.kobj),
+ ret);
}
/* register memory section under specified node if it spans that node */
@@ -827,7 +834,8 @@ static int register_mem_block_under_node_early(struct memory_block *mem_blk,
if (page_nid != nid)
continue;
- return do_register_memory_block_under_node(nid, mem_blk);
+ do_register_memory_block_under_node(nid, mem_blk);
+ return 0;
}
/* mem section does not span the specified node */
return 0;
@@ -842,7 +850,8 @@ static int register_mem_block_under_node_hotplug(struct memory_block *mem_blk,
{
int nid = *(int *)arg;
- return do_register_memory_block_under_node(nid, mem_blk);
+ do_register_memory_block_under_node(nid, mem_blk);
+ return 0;
}
/*
@@ -860,8 +869,8 @@ void unregister_memory_block_under_nodes(struct memory_block *mem_blk)
kobject_name(&node_devices[mem_blk->nid]->dev.kobj));
}
-int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn,
- enum meminit_context context)
+void link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn,
+ enum meminit_context context)
{
walk_memory_blocks_func_t func;
@@ -870,9 +879,9 @@ int link_mem_sections(int nid, unsigned long start_pfn, unsigned long end_pfn,
else
func = register_mem_block_under_node_early;
- return walk_memory_blocks(PFN_PHYS(start_pfn),
- PFN_PHYS(end_pfn - start_pfn), (void *)&nid,
- func);
+ walk_memory_blocks(PFN_PHYS(start_pfn), PFN_PHYS(end_pfn - start_pfn),
+ (void *)&nid, func);
+ return;
}
#ifdef CONFIG_HUGETLBFS