This patch has been verified to apply cleanly to 2.5.30
This patch goes back almost 2 years. First sent on: 30 September 2000
Ignored every time.
The following patch is required so that munmap(0x8000, *) does not cause
ARM kernels to crash. The problem is that the machine vectors are at
virtual address 0. Unfortunately, when free_pgtables() is called, it
clears first level page tables starting at 0 in this case, and takes
out the machine vectors. This then results in an unrecoverable hang.
We already have FIRST_USER_PGD_NR to define the first entry in the pgd
which may be cleared, so we use this to clamp "start_index"
appropriately. The following patch does this. Tested on ARM.
mm/mmap.c | 2 ++
1 files changed, 2 insertions
diff -urN orig/mm/mmap.c linux/mm/mmap.c
--- orig/mm/mmap.c Sat Jul 27 13:55:25 2002
+++ linux/mm/mmap.c Sat Jul 27 14:14:43 2002
@@ -888,6 +888,8 @@
* old method of shifting the VA >> by PGDIR_SHIFT doesn't work.
*/
start_index = pgd_index(first);
+ if (start_index < FIRST_USER_PGD_NR)
+ start_index = FIRST_USER_PGD_NR;
end_index = pgd_index(last);
if (end_index > start_index) {
clear_page_tables(tlb, start_index, end_index - start_index);
-
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This archive was generated by hypermail 2b29 : Wed Aug 07 2002 - 22:00:22 EST