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0f7e663dea
tt-mode closes switch_pipes in exit_thread_tt and kills processes in switch_to_tt, if the exit_state is EXIT_DEAD or EXIT_ZOMBIE. In very rare cases the exiting process can be scheduled out after having set exit_state and closed switch_pipes (from release_task it calls proc_pid_flush, which might sleep). If this process is to be restarted, UML failes in switch_to_tt with: write of switch_pipe failed, err = 9 We fix this by closing switch_pipes not in exit_thread_tt, but later in release_thread_tt. Additionally, we set switch_pipe[0] = 0 after closing. switch_to_tt must not kill "from" process depending on its exit_state, but must kill it after release_thread was processed only, so it examines switch_pipe[0] for its decision. Signed-off-by: Bodo Stroesser <bstroesser@fujitsu-siemens.com> Signed-off-by: Jeff Dike <jdike@addtoit.com> Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
53 lines
1.9 KiB
C
53 lines
1.9 KiB
C
/*
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* Copyright (C) 2002 Jeff Dike (jdike@karaya.com)
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* Licensed under the GPL
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*/
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#ifndef __SKAS_MODE_KERN_H__
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#define __SKAS_MODE_KERN_H__
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#include "linux/sched.h"
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#include "asm/page.h"
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#include "asm/ptrace.h"
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extern void flush_thread_skas(void);
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extern void *switch_to_skas(void *prev, void *next);
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extern void start_thread_skas(struct pt_regs *regs, unsigned long eip,
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unsigned long esp);
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extern int copy_thread_skas(int nr, unsigned long clone_flags,
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unsigned long sp, unsigned long stack_top,
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struct task_struct *p, struct pt_regs *regs);
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extern void release_thread_skas(struct task_struct *task);
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extern void initial_thread_cb_skas(void (*proc)(void *), void *arg);
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extern void init_idle_skas(void);
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extern void flush_tlb_kernel_range_skas(unsigned long start,
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unsigned long end);
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extern void flush_tlb_kernel_vm_skas(void);
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extern void __flush_tlb_one_skas(unsigned long addr);
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extern void flush_tlb_range_skas(struct vm_area_struct *vma,
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unsigned long start, unsigned long end);
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extern void flush_tlb_mm_skas(struct mm_struct *mm);
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extern void force_flush_all_skas(void);
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extern long execute_syscall_skas(void *r);
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extern void before_mem_skas(unsigned long unused);
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extern unsigned long set_task_sizes_skas(int arg, unsigned long *host_size_out,
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unsigned long *task_size_out);
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extern int start_uml_skas(void);
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extern int external_pid_skas(struct task_struct *task);
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extern int thread_pid_skas(struct task_struct *task);
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#define kmem_end_skas (host_task_size - 1024 * 1024)
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#endif
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/*
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* Overrides for Emacs so that we follow Linus's tabbing style.
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* Emacs will notice this stuff at the end of the file and automatically
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* adjust the settings for this buffer only. This must remain at the end
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* of the file.
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* ---------------------------------------------------------------------------
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* Local variables:
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* c-file-style: "linux"
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* End:
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*/
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