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SubjectRe: 2.5.55/.56 instant reboot problem on 486
On Sun, 12 Jan 2003, Brian Gerst wrote:

> The problem is that one_page_table_init() pulls the rug out from under
> the kernel by installing a new page table before setting it up. A 486
> has a small TLB so any miss will cause a triple fault and reset. Try
> this patch and see if it fixes it.

As someone who uses 486's for routers on occasion, thank you!

--
bill davidsen <davidsen@tmr.com>
CTO, TMR Associates, Inc
Doing interesting things with little computers since 1979.
diff -urN linux-2.5.56/arch/i386/mm/init.c linux/arch/i386/mm/init.c
--- linux-2.5.56/arch/i386/mm/init.c Sun Jan 12 00:16:22 2003
+++ linux/arch/i386/mm/init.c Sun Jan 12 01:48:28 2003
@@ -71,12 +71,16 @@
*/
static pte_t * __init one_page_table_init(pmd_t *pmd)
{
- pte_t *page_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
- set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
- if (page_table != pte_offset_kernel(pmd, 0))
- BUG();
+ if (pmd_none(*pmd)) {
+ pte_t *page_table = (pte_t *) alloc_bootmem_low_pages(PAGE_SIZE);
+ set_pmd(pmd, __pmd(__pa(page_table) | _PAGE_TABLE));
+ if (page_table != pte_offset_kernel(pmd, 0))
+ BUG();

- return page_table;
+ return page_table;
+ }
+
+ return pte_offset_kernel(pmd, 0);
}

/*
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