Revision a6a5349d17f2a5c37079826f1a1474c3d08c6b53 authored by Sage Weil on 13 April 2010, 21:07:07 UTC, committed by Sage Weil on 13 April 2010, 21:07:07 UTC
Use a separate class for ceph sockets to prevent lockdep confusion. Because ceph sockets only get passed kernel pointers, there is no dependency from sk_lock -> mmap_sem. If we share the same class as other sockets, lockdep detects a circular dependency from mmap_sem (page fault) -> fs mutex -> sk_lock -> mmap_sem because dependencies are noted from both ceph and user contexts. Using a separate class prevents the sk_lock(ceph) -> mmap_sem dependency and makes lockdep happy. Signed-off-by: Sage Weil <sage@newdream.net>
1 parent e1e4dd0
elfcore.c
#include <linux/elf.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <asm/elf.h>
Elf_Half __weak elf_core_extra_phdrs(void)
{
return 0;
}
int __weak elf_core_write_extra_phdrs(struct file *file, loff_t offset, size_t *size,
unsigned long limit)
{
return 1;
}
int __weak elf_core_write_extra_data(struct file *file, size_t *size,
unsigned long limit)
{
return 1;
}
size_t __weak elf_core_extra_data_size(void)
{
return 0;
}
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