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catch up to i386:

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- remove Giant for vm related traps
- don't hold Giant for MP safe syscalls

Reviewed-by: jhb
This commit is contained in:
Andrew Gallatin 2001-05-23 16:34:07 +00:00
parent d825ca42c9
commit 42fcdcb3e9
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=77045
1 changed files with 24 additions and 7 deletions
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31
sys/alpha/alpha/trap.c
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@ -513,7 +513,6 @@ trap(a0, a1, a2, entry, framep)
goto out;
}
mtx_lock(&Giant);
/*
* It is only a kernel address space fault iff:
* 1. !user and
@ -620,11 +619,9 @@ trap(a0, a1, a2, entry, framep)
rv = KERN_INVALID_ADDRESS;
}
if (rv == KERN_SUCCESS) {
mtx_unlock(&Giant);
goto out;
}
mtx_unlock(&Giant);
if (!user) {
/* Check for copyin/copyout fault */
if (p != NULL &&
@ -671,6 +668,7 @@ trap(a0, a1, a2, entry, framep)
return;
dopanic:
mtx_lock(&Giant);
printtrap(a0, a1, a2, entry, framep, 1, user);
/* XXX dump registers */
@ -680,6 +678,7 @@ trap(a0, a1, a2, entry, framep)
#endif
panic("trap");
mtx_unlock(&Giant);
}
/*
@ -723,7 +722,6 @@ syscall(code, framep)
p->p_md.md_kernnest++;
critical_exit(s);
#endif
mtx_lock(&Giant);
framep->tf_regs[FRAME_TRAPARG_A0] = 0;
framep->tf_regs[FRAME_TRAPARG_A1] = 0;
@ -791,9 +789,20 @@ syscall(code, framep)
case 0:
break;
}
/*
* Try to run the syscall without the MP lock if the syscall
* is MP safe
*/
if ((callp->sy_narg & SYF_MPSAFE) == 0) {
mtx_lock(&Giant);
}
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSCALL))
if (KTRPOINT(p, KTR_SYSCALL)) {
if (!mtx_owned(&Giant))
mtx_lock(&Giant);
ktrsyscall(p->p_tracep, code, (callp->sy_narg & SYF_ARGMASK), args + hidden);
}
#endif
if (error == 0) {
p->p_retval[0] = 0;
@ -830,10 +839,18 @@ syscall(code, framep)
userret(p, framep, sticks);
#ifdef KTRACE
if (KTRPOINT(p, KTR_SYSRET))
if (KTRPOINT(p, KTR_SYSRET)) {
if (!mtx_owned(&Giant))
mtx_lock(&Giant);
ktrsysret(p->p_tracep, code, error, p->p_retval[0]);
}
#endif
mtx_unlock(&Giant);
/*
* Release Giant if we had to get it
*/
if (mtx_owned(&Giant))
mtx_unlock(&Giant);
/*
* This works because errno is findable through the