mirror of
git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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188b64f288
This was perhaps intended to do _nofault copies, but the real reason is lost to history. Remove this, it's not needed, and using longjmp() out of the middle of the signal handler with all the state it has modified is not going to be a good idea anyway. Link: https://patch.msgid.link/20241010224513.901c4d390b3e.Ia74742668b44603c1ca23dd36f90e964e6e7ee55@changeid Signed-off-by: Johannes Berg <johannes.berg@intel.com>
88 lines
1.7 KiB
C
88 lines
1.7 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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*/
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#ifndef __UM_PROCESSOR_GENERIC_H
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#define __UM_PROCESSOR_GENERIC_H
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struct pt_regs;
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struct task_struct;
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#include <asm/ptrace.h>
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#include <sysdep/archsetjmp.h>
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#include <linux/prefetch.h>
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#include <asm/cpufeatures.h>
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struct mm_struct;
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struct thread_struct {
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struct pt_regs regs;
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struct pt_regs *segv_regs;
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struct task_struct *prev_sched;
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struct arch_thread arch;
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jmp_buf switch_buf;
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struct {
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struct {
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int (*proc)(void *);
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void *arg;
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} thread;
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} request;
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};
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#define INIT_THREAD \
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{ \
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.regs = EMPTY_REGS, \
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.prev_sched = NULL, \
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.arch = INIT_ARCH_THREAD, \
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.request = { } \
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}
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/*
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* User space process size: 3GB (default).
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*/
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extern unsigned long task_size;
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#define TASK_SIZE (task_size)
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#undef STACK_TOP
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#undef STACK_TOP_MAX
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extern unsigned long stacksizelim;
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#define STACK_ROOM (stacksizelim)
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#define STACK_TOP (TASK_SIZE - 2 * PAGE_SIZE)
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#define STACK_TOP_MAX STACK_TOP
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/* This decides where the kernel will search for a free chunk of vm
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* space during mmap's.
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*/
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#define TASK_UNMAPPED_BASE (0x40000000)
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extern void start_thread(struct pt_regs *regs, unsigned long entry,
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unsigned long stack);
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struct cpuinfo_um {
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unsigned long loops_per_jiffy;
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int ipi_pipe[2];
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int cache_alignment;
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union {
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__u32 x86_capability[NCAPINTS + NBUGINTS];
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unsigned long x86_capability_alignment;
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};
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};
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extern struct cpuinfo_um boot_cpu_data;
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#define cpu_data(cpu) boot_cpu_data
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#define current_cpu_data boot_cpu_data
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#define cache_line_size() (boot_cpu_data.cache_alignment)
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#define KSTK_REG(tsk, reg) get_thread_reg(reg, &tsk->thread.switch_buf)
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extern unsigned long __get_wchan(struct task_struct *p);
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#endif
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