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SubjectRe: test10-pre2
On Thu, Oct 12, 2000 at 01:18:53PM -0700, Linus Torvalds wrote:
> See the arch/x86/mm/fault.c changes to see what arch-specific changes this
> can entail.
>
This patch works for me...

Ivan.

--- linux/include/asm-alpha/bitops.h.orig Wed Oct 4 17:06:59 2000
+++ linux/include/asm-alpha/bitops.h Fri Oct 13 13:41:02 2000
@@ -2,7 +2,6 @@
#define _ALPHA_BITOPS_H

#include <linux/config.h>
-#include <linux/kernel.h>

/*
* Copyright 1994, Linus Torvalds.
--- linux/include/asm-alpha/pgalloc.h.orig Mon Aug 14 17:32:04 2000
+++ linux/include/asm-alpha/pgalloc.h Fri Oct 13 13:44:44 2000
@@ -378,20 +378,4 @@ extern inline pmd_t * pmd_alloc(pgd_t *p

extern int do_check_pgt_cache(int, int);

-extern inline void set_pgdir(unsigned long address, pgd_t entry)
-{
- struct task_struct * p;
- pgd_t *pgd;
-
- read_lock(&tasklist_lock);
- for_each_task(p) {
- if (!p->mm)
- continue;
- *pgd_offset(p->mm,address) = entry;
- }
- read_unlock(&tasklist_lock);
- for (pgd = (pgd_t *)pgd_quicklist; pgd; pgd = (pgd_t *)*(unsigned long *)pgd)
- pgd[(address >> PGDIR_SHIFT) & (PTRS_PER_PAGE - 1)] = entry;
-}
-
#endif /* _ALPHA_PGALLOC_H */
--- linux/arch/alpha/mm/fault.c.orig Wed Oct 4 17:06:45 2000
+++ linux/arch/alpha/mm/fault.c Fri Oct 13 19:52:43 2000
@@ -108,6 +108,9 @@ do_page_fault(unsigned long address, uns
if (!mm || in_interrupt())
goto no_context;

+ if (address >= TASK_SIZE)
+ goto vmalloc_fault;
+
down(&mm->mmap_sem);
vma = find_vma(mm, address);
if (!vma)
@@ -157,6 +160,7 @@ good_area:
bad_area:
up(&mm->mmap_sem);

+bad_area_nosemaphore:
if (user_mode(regs)) {
force_sig(SIGSEGV, current);
return;
@@ -204,4 +208,33 @@ do_sigbus:
if (!user_mode(regs))
goto no_context;
return;
+
+vmalloc_fault:
+ {
+ /*
+ * Synchronize this task's top level page-table
+ * with the 'reference' page table.
+ */
+ int offset = __pgd_offset(address);
+ pgd_t *pgd, *pgd_k;
+ pmd_t *pmd, *pmd_k;
+
+ pgd = current->active_mm->pgd + offset;
+ pgd_k = init_mm.pgd + offset;
+
+ if (!pgd_present(*pgd)) {
+ if (!pgd_present(*pgd_k))
+ goto bad_area_nosemaphore;
+ pgd_val(*pgd) = pgd_val(*pgd_k);
+ return;
+ }
+
+ pmd = pmd_offset(pgd, address);
+ pmd_k = pmd_offset(pgd_k, address);
+
+ if (pmd_present(*pmd) || !pmd_present(*pmd_k))
+ goto bad_area_nosemaphore;
+ pmd_val(*pmd) = pmd_val(*pmd_k);
+ return;
+ }
}
-
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