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2f681ba4b3
This selects the THREAD_INFO_IN_TASK option for UM and changes the way that the current task is discovered. This is trivial though, as UML already tracks the current task in cpu_tasks[] and this can be used to retrieve it. Also remove the signal handler code that copies the thread information into the IRQ stack. It is obsolete now, which also means that the mentioned race condition cannot happen anymore. Signed-off-by: Benjamin Berg <benjamin.berg@intel.com> Reviewed-by: Hajime Tazaki <thehajime@gmail.com> Link: https://patch.msgid.link/20241111102910.46512-1-benjamin@sipsolutions.net Signed-off-by: Johannes Berg <johannes.berg@intel.com>
56 lines
1.6 KiB
C
56 lines
1.6 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2002 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#ifndef __UM_THREAD_INFO_H
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#define __UM_THREAD_INFO_H
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#define THREAD_SIZE_ORDER CONFIG_KERNEL_STACK_ORDER
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#define THREAD_SIZE ((1 << CONFIG_KERNEL_STACK_ORDER) * PAGE_SIZE)
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#ifndef __ASSEMBLY__
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#include <asm/types.h>
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#include <asm/page.h>
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#include <asm/segment.h>
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#include <sysdep/ptrace_user.h>
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struct thread_info {
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unsigned long flags; /* low level flags */
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__u32 cpu; /* current CPU */
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int preempt_count; /* 0 => preemptable,
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<0 => BUG */
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};
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#define INIT_THREAD_INFO(tsk) \
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{ \
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.flags = 0, \
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.cpu = 0, \
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.preempt_count = INIT_PREEMPT_COUNT, \
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}
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#endif
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#define TIF_SYSCALL_TRACE 0 /* syscall trace active */
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#define TIF_SIGPENDING 1 /* signal pending */
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#define TIF_NEED_RESCHED 2 /* rescheduling necessary */
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#define TIF_NOTIFY_SIGNAL 3 /* signal notifications exist */
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#define TIF_RESTART_BLOCK 4
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#define TIF_MEMDIE 5 /* is terminating due to OOM killer */
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#define TIF_SYSCALL_AUDIT 6
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#define TIF_RESTORE_SIGMASK 7
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#define TIF_NOTIFY_RESUME 8
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#define TIF_SECCOMP 9 /* secure computing */
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#define TIF_SINGLESTEP 10 /* single stepping userspace */
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#define _TIF_SYSCALL_TRACE (1 << TIF_SYSCALL_TRACE)
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#define _TIF_SIGPENDING (1 << TIF_SIGPENDING)
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#define _TIF_NEED_RESCHED (1 << TIF_NEED_RESCHED)
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#define _TIF_NOTIFY_SIGNAL (1 << TIF_NOTIFY_SIGNAL)
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#define _TIF_MEMDIE (1 << TIF_MEMDIE)
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#define _TIF_SYSCALL_AUDIT (1 << TIF_SYSCALL_AUDIT)
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#define _TIF_SECCOMP (1 << TIF_SECCOMP)
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#define _TIF_SINGLESTEP (1 << TIF_SINGLESTEP)
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#endif
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