#include #include #include #include #include #include #include #include #include void change_floppy(char *fmt, ...); void mount_block_root(char *name, int flags); void mount_root(void); extern int root_mountflags; static inline int create_dev(char *name, dev_t dev) { sys_unlink(name); return sys_mknod(name, S_IFBLK|0600, new_encode_dev(dev)); } #if BITS_PER_LONG == 32 static inline u32 bstat(char *name) { struct stat64 stat; if (sys_stat64(name, &stat) != 0) return 0; if (!S_ISBLK(stat.st_mode)) return 0; if (stat.st_rdev != (u32)stat.st_rdev) return 0; return stat.st_rdev; } #else static inline u32 bstat(char *name) { struct stat stat; if (sys_newstat(name, &stat) != 0) return 0; if (!S_ISBLK(stat.st_mode)) return 0; return stat.st_rdev; } #endif #ifdef CONFIG_BLK_DEV_RAM int __init rd_load_disk(int n); int __init rd_load_image(char *from); #else static inline int rd_load_disk(int n) { return 0; } static inline int rd_load_image(char *from) { return 0; } #endif #ifdef CONFIG_BLK_DEV_INITRD bool __init initrd_load(void); #else static inline bool initrd_load(void) { return false; } #endif #ifdef CONFIG_BLK_DEV_MD void md_run_setup(void); #else static inline void md_run_setup(void) {} #endif t type='submit' value='switch'/> net-next plumbingsTobias Klauser
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authorAndrei Vagin <avagin@openvz.org>2017-01-04 19:28:14 -0800
committerEric W. Biederman <ebiederm@xmission.com>2017-01-10 13:34:56 +1300
commitadd7c65ca426b7a37184dd3d2172394e23d585d6 (patch)
tree28b08b519540041b06ed0ab0b1c005076b932e8e /include/net/rawv6.h
parent75422726b0f717d67db3283c2eb5bc14fa2619c5 (diff)
pid: fix lockdep deadlock warning due to ucount_lock
========================================================= [ INFO: possible irq lock inversion dependency detected ] 4.10.0-rc2-00024-g4aecec9-dirty #118 Tainted: G W --------------------------------------------------------- swapper/1/0 just changed the state of lock: (&(&sighand->siglock)->rlock){-.....}, at: [<ffffffffbd0a1bc6>] __lock_task_sighand+0xb6/0x2c0 but this lock took another, HARDIRQ-unsafe lock in the past: (ucounts_lock){+.+...} and interrupts could create inverse lock ordering between them. other info that might help us debug this: Chain exists of: &(&sighand->siglock)->rlock --> &(&tty->ctrl_lock)->rlock --> ucounts_lock Possible interrupt unsafe locking scenario: CPU0 CPU1 ---- ---- lock(ucounts_lock); local_irq_disable(); lock(&(&sighand->siglock)->rlock); lock(&(&tty->ctrl_lock)->rlock); <Interrupt> lock(&(&sighand->siglock)->rlock); *** DEADLOCK *** This patch removes a dependency between rlock and ucount_lock. Fixes: f333c700c610 ("pidns: Add a limit on the number of pid namespaces") Cc: stable@vger.kernel.org Signed-off-by: Andrei Vagin <avagin@openvz.org> Acked-by: Al Viro <viro@ZenIV.linux.org.uk> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
Diffstat (limited to 'include/net/rawv6.h')