[ARM] 4644/2: fix flush_kern_tlb_range() in module space

For kernel addresses between TASK_SIZE and PAGE_OFFSET,
flush_tlb_kern_range() does not work as would be expected.

The TLB invalidate works with a matching ASID, or on entries marked as
global.  The set_pte_at() macro marks addresses >= PAGE_OFFSET as
global, but not addresses from TASK_SIZE to PAGE_OFFSET, which are
also kernel addresses.

The result is that the entries in this range are not actually
invalidated by flush_tlb_kern_range().

This patch instead marks addresses >= TASK_SIZE as global.

Signed-off-by: Satoru Fujii <s-fujii@ct.jp.nec.com>
Signed-off-by: Kevin Hilman <khilman@mvista.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>

diff --git a/include/asm-arm/pgtable.h b/include/asm-arm/pgtable.h
index d2e8171..5e01824 100644 (file)
--- a/include/asm-arm/pgtable.h
+++ b/include/asm-arm/pgtable.h
@@ -249,7 +249,7 @@ extern struct page *empty_zero_page;
 #define set_pte_ext(ptep,pte,ext) cpu_set_pte_ext(ptep,pte,ext)
 
 #define set_pte_at(mm,addr,ptep,pteval) do { \
-       set_pte_ext(ptep, pteval, (addr) >= PAGE_OFFSET ? 0 : PTE_EXT_NG); \
+       set_pte_ext(ptep, pteval, (addr) >= TASK_SIZE ? 0 : PTE_EXT_NG); \
  } while (0)
 
 /*