[SPARC64]: Increase top of 32-bit process stack.

Put it one page below the top of the 32-bit address space.
This gives us ~16MB more address space to work with.

Signed-off-by: David S. Miller <davem@davemloft.net>

1 files changed, 7 insertions, 6 deletions

diff --git a/arch/sparc64/kernel/sys_sparc.c b/arch/sparc64/kernel/sys_sparc.c
index 61dffb9349bd..9019b41fc02a 100644
--- a/arch/sparc64/kernel/sys_sparc.c
+++ b/arch/sparc64/kernel/sys_sparc.c
@@ -30,6 +30,7 @@
 #include <asm/ipc.h>
 #include <asm/utrap.h>
 #include <asm/perfctr.h>
+#include <asm/a.out.h>
 
 /* #define DEBUG_UNIMP_SYSCALL */
 
@@ -130,7 +131,7 @@ unsigned long arch_get_unmapped_area(struct file *filp, unsigned long addr, unsi
         }
 
         if (test_thread_flag(TIF_32BIT))
-                task_size = 0xf0000000UL;
+                task_size = STACK_TOP32;
         if (unlikely(len > task_size || len >= VA_EXCLUDE_START))
                 return -ENOMEM;
 
@@ -203,7 +204,7 @@ arch_get_unmapped_area_topdown(struct file *filp, const unsigned long addr0,
 {
         struct vm_area_struct *vma;
         struct mm_struct *mm = current->mm;
-        unsigned long task_size = 0xf0000000UL;
+        unsigned long task_size = STACK_TOP32;
         unsigned long addr = addr0;
         int do_color_align;
 
@@ -370,7 +371,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
                 mm->unmap_area = arch_unmap_area;
         } else {
                 /* We know it's 32-bit */
-                unsigned long task_size = 0xf0000000UL;
+                unsigned long task_size = STACK_TOP32;
                 unsigned long gap;
 
                 gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
@@ -388,7 +389,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
 asmlinkage unsigned long sparc_brk(unsigned long brk)
 {
         /* People could try to be nasty and use ta 0x6d in 32bit programs */
-        if (test_thread_flag(TIF_32BIT) && brk >= 0xf0000000UL)
+        if (test_thread_flag(TIF_32BIT) && brk >= STACK_TOP32)
                 return current->mm->brk;
 
         if (unlikely(straddles_64bit_va_hole(current->mm->brk, brk)))
@@ -554,10 +555,10 @@ asmlinkage unsigned long sys_mmap(unsigned long addr, unsigned long len,
         retval = -EINVAL;
 
         if (test_thread_flag(TIF_32BIT)) {
-                if (len >= 0xf0000000UL)
+                if (len >= STACK_TOP32)
                         goto out_putf;
 
-                if ((flags & MAP_FIXED) && addr > 0xf0000000UL - len)
+                if ((flags & MAP_FIXED) && addr > STACK_TOP32 - len)
                         goto out_putf;
         } else {
                 if (len >= VA_EXCLUDE_START)