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SubjectRe: Patch 2.1.120 breaks DOSEMU (fwd)


On Sun, 6 Sep 1998, Hans Lermen wrote:
>
> I can confirm the below posting from Alberto Vignani:
>
> The ldt changes in i386/kernel/process.c _do_ break DOSEMU's DPMI.

I believe you.. Does the appended one-liner fix it for you?

> What were these ldt changes supposed to fix?

2.1.120 fixes resetting the LDT back to the original value, and cleans it
up a bit. Very few things actually depend on the original value, but iBCS2
does.

The breakage in 2.1.120 is due to forgetting to initialize a member in the
task-struct when we create a new LDT - we correctly load the entry, but
the very next task-switch will forget about it again..

Linus

-----
--- v2.1.120/linux/arch/i386/kernel/ldt.c Tue Aug 18 22:02:02 1998
+++ linux/arch/i386/kernel/ldt.c Sat Sep 5 16:46:23 1998
@@ -82,6 +82,7 @@
int i = current->tarray_ptr - &task[0];
mm->segments = ldt;
set_ldt_desc(gdt+(i<<1)+FIRST_LDT_ENTRY, ldt, LDT_ENTRIES);
+ current->tss.ldt = _LDT(i);
load_ldt(i);
if (atomic_read(&mm->count) > 1)
printk(KERN_WARNING

-
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