/* * Common low level (register) ptrace helpers * * Copyright 2004-2011 Analog Devices Inc. * * Licensed under the GPL-2 or later. */ #ifndef __ASM_GENERIC_PTRACE_H__ #define __ASM_GENERIC_PTRACE_H__ #ifndef __ASSEMBLY__ /* Helpers for working with the instruction pointer */ #ifndef GET_IP #define GET_IP(regs) ((regs)->pc) #endif #ifndef SET_IP #define SET_IP(regs, val) (GET_IP(regs) = (val)) #endif static inline unsigned long instruction_pointer(struct pt_regs *regs) { return GET_IP(regs); } static inline void instruction_pointer_set(struct pt_regs *regs, unsigned long val) { SET_IP(regs, val); } #ifndef profile_pc #define profile_pc(regs) instruction_pointer(regs) #endif /* Helpers for working with the user stack pointer */ #ifndef GET_USP #define GET_USP(regs) ((regs)->usp) #endif #ifndef SET_USP #define SET_USP(regs, val) (GET_USP(regs) = (val)) #endif static inline unsigned long user_stack_pointer(struct pt_regs *regs) { return GET_USP(regs); } static inline void user_stack_pointer_set(struct pt_regs *regs, unsigned long val) { SET_USP(regs, val); } /* Helpers for working with the frame pointer */ #ifndef GET_FP #define GET_FP(regs) ((regs)->fp) #endif #ifndef SET_FP #define SET_FP(regs, val) (GET_FP(regs) = (val)) #endif static inline unsigned long frame_pointer(struct pt_regs *regs) { return GET_FP(regs); } static inline void frame_pointer_set(struct pt_regs *regs, unsigned long val) { SET_FP(regs, val); } #endif /* __ASSEMBLY__ */ #endif private-remove'>summaryrefslogtreecommitdiff
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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 /tools/testing/ktest
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 'tools/testing/ktest')