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x86: Update some stale comments in cpu_fork() and cpu_copy_thread().

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Neither of these routines allocate stacks.

Reviewed by:	kib
MFC after:	1 week
Sponsored by:	Netflix
Differential Revision:	https://reviews.freebsd.org/D29227
This commit is contained in:
John Baldwin 2021-03-12 09:48:49 -08:00
parent c7b0213523
commit 40d593d17e
2 changed files with 8 additions and 4 deletions
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6
sys/amd64/amd64/vm_machdep.c
View File

@ -198,7 +198,6 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
bcopy(&p1->p_md, mdp2, sizeof(*mdp2));
/*
* Create a new fresh stack for the new process.
* Copy the trap frame for the return to user mode as if from a
* syscall. This copies most of the user mode register values.
*/
@ -606,7 +605,10 @@ cpu_copy_thread(struct thread *td, struct thread *td0)
/*
* Create a new fresh stack for the new thread.
* Copy user general-purpose registers.
*
* Some of these registers are rewritten by cpu_set_upcall()
* and linux_set_upcall_kse().
*/
bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));

6
sys/i386/i386/vm_machdep.c
View File

@ -205,7 +205,6 @@ cpu_fork(struct thread *td1, struct proc *p2, struct thread *td2, int flags)
bcopy(&p1->p_md, mdp2, sizeof(*mdp2));
/*
* Create a new fresh stack for the new process.
* Copy the trap frame for the return to user mode as if from a
* syscall. This copies most of the user mode register values.
* The -VM86_STACK_SPACE (-16) is so we can expand the trapframe
@ -473,7 +472,10 @@ cpu_copy_thread(struct thread *td, struct thread *td0)
}
/*
* Create a new fresh stack for the new thread.
* Copy user general-purpose registers.
*
* Some of these registers are rewritten by cpu_set_upcall()
* and linux_set_upcall_kse().
*/
bcopy(td0->td_frame, td->td_frame, sizeof(struct trapframe));