[RFC, PATCHv1 28/28] TESTING-ONLY: bump TASK_SIZE_MAX

[Kirill A. Shutemov]

This is useful for now to play with.

We would need to imlement proper opt-in with prctl()/personality()/ELF
flag.
---
 arch/x86/include/asm/processor.h | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/arch/x86/include/asm/processor.h b/arch/x86/include/asm/processor.h
index 63def9537a2d..ab44cbe853cb 100644
--- a/arch/x86/include/asm/processor.h
+++ b/arch/x86/include/asm/processor.h
@@ -755,7 +755,8 @@ extern unsigned long thread_saved_pc(struct task_struct *tsk);
  * particular problem by preventing anything from being mapped
  * at the maximum canonical address.
  */
-#define TASK_SIZE_MAX	((1UL << 47) - PAGE_SIZE)
+/* TODO: use >47bit only if requested */
+#define TASK_SIZE_MAX	((1UL << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE)
 
 /* This decides where the kernel will search for a free chunk of vm
  * space during mmap's.
-- 
2.10.2