svn commit: r337773 - in head/sys/amd64: amd64 include
Alexey Dokuchaev
danfe at FreeBSD.org
Wed Aug 15 08:45:05 UTC 2018
On Tue, Aug 14, 2018 at 04:37:15PM +0000, Konstantin Belousov wrote:
> New Revision: 337773
> URL: https://svnweb.freebsd.org/changeset/base/337773
>
> Log:
> amd64: ensure that curproc->p_vmspace pmap always matches PCPU
> curpmap.
>
> When performing context switch on a machine without PCID, if current
> %cr3 equals to the new pmap %cr3, which is typical for kernel_pmap
> vs. kernel process, I overlooked to update PCPU curpmap value. Remove
> check for %cr3 not equal to pm_cr3 for doing the update. It is
> believed that this case cannot happen at all, due to other changes in
> this revision.
> ...
> - } else if (cr3 != pmap->pm_cr3) {
> + } else {
> load_cr3(pmap->pm_cr3);
If this case cannot happen at all, would it make sense to assert it?
./danfe
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