9a181c5861
Three uml device drivers still use the big kernel lock, but all of them can be safely converted to using a per-driver mutex instead. Most likely this is not even necessary, so after further review these can and should be removed as well. The exec system call no longer requires the BKL either, so remove it from there, too. Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Jeff Dike <jdike@addtoit.com> Cc: user-mode-linux-devel@lists.sourceforge.net
89 lines
1.9 KiB
C
89 lines
1.9 KiB
C
/*
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* Copyright (C) 2000 - 2007 Jeff Dike (jdike@{addtoit,linux.intel}.com)
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* Licensed under the GPL
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*/
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#include "linux/stddef.h"
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#include "linux/fs.h"
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#include "linux/smp_lock.h"
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#include "linux/ptrace.h"
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#include "linux/sched.h"
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#include "linux/slab.h"
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#include "asm/current.h"
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#include "asm/processor.h"
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#include "asm/uaccess.h"
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#include "as-layout.h"
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#include "mem_user.h"
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#include "skas.h"
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#include "os.h"
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#include "internal.h"
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void flush_thread(void)
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{
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void *data = NULL;
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int ret;
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arch_flush_thread(¤t->thread.arch);
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ret = unmap(¤t->mm->context.id, 0, STUB_START, 0, &data);
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ret = ret || unmap(¤t->mm->context.id, STUB_END,
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host_task_size - STUB_END, 1, &data);
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if (ret) {
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printk(KERN_ERR "flush_thread - clearing address space failed, "
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"err = %d\n", ret);
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force_sig(SIGKILL, current);
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}
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__switch_mm(¤t->mm->context.id);
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}
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void start_thread(struct pt_regs *regs, unsigned long eip, unsigned long esp)
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{
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set_fs(USER_DS);
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PT_REGS_IP(regs) = eip;
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PT_REGS_SP(regs) = esp;
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}
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static long execve1(const char *file,
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const char __user *const __user *argv,
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const char __user *const __user *env)
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{
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long error;
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error = do_execve(file, argv, env, ¤t->thread.regs);
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if (error == 0) {
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task_lock(current);
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current->ptrace &= ~PT_DTRACE;
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#ifdef SUBARCH_EXECVE1
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SUBARCH_EXECVE1(¤t->thread.regs.regs);
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#endif
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task_unlock(current);
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}
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return error;
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}
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long um_execve(const char *file, char __user *__user *argv, char __user *__user *env)
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{
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long err;
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err = execve1(file, argv, env);
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if (!err)
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UML_LONGJMP(current->thread.exec_buf, 1);
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return err;
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}
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long sys_execve(const char __user *file, char __user *__user *argv,
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char __user *__user *env)
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{
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long error;
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char *filename;
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filename = getname(file);
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error = PTR_ERR(filename);
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if (IS_ERR(filename)) goto out;
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error = execve1(filename, argv, env);
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putname(filename);
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out:
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return error;
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}
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