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Subject[PATCH] SPARC: use helpers for rlimits
Date
Make sure compiler won't do weird things with limits. E.g. fetching
them twice may return 2 different values after writable limits are
implemented.

I.e. either use rlimit helpers added in
3e10e716abf3c71bdb5d86b8f507f9e72236c9cd
or ACCESS_ONCE if not applicable.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: "David S. Miller" <davem@davemloft.net>
Cc: sparclinux@vger.kernel.org
---
arch/sparc/kernel/sys_sparc_64.c | 6 +++---
1 files changed, 3 insertions(+), 3 deletions(-)
diff --git a/arch/sparc/kernel/sys_sparc_64.c b/arch/sparc/kernel/sys_sparc_64.c
index cfa0e19..d77f543 100644
--- a/arch/sparc/kernel/sys_sparc_64.c
+++ b/arch/sparc/kernel/sys_sparc_64.c
@@ -365,6 +365,7 @@ EXPORT_SYMBOL(get_fb_unmapped_area);
void arch_pick_mmap_layout(struct mm_struct *mm)
{
unsigned long random_factor = 0UL;
+ unsigned long gap;

if (current->flags & PF_RANDOMIZE) {
random_factor = get_random_int();
@@ -379,9 +380,10 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
* Fall back to the standard layout if the personality
* bit is set, or if the expected stack growth is unlimited:
*/
+ gap = rlimit(RLIMIT_STACK);
if (!test_thread_flag(TIF_32BIT) ||
(current->personality & ADDR_COMPAT_LAYOUT) ||
- current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY ||
+ gap == RLIM_INFINITY ||
sysctl_legacy_va_layout) {
mm->mmap_base = TASK_UNMAPPED_BASE + random_factor;
mm->get_unmapped_area = arch_get_unmapped_area;
@@ -389,9 +391,7 @@ void arch_pick_mmap_layout(struct mm_struct *mm)
} else {
/* We know it's 32-bit */
unsigned long task_size = STACK_TOP32;
- unsigned long gap;

- gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
if (gap < 128 * 1024 * 1024)
gap = 128 * 1024 * 1024;
if (gap > (task_size / 6 * 5))
--
1.6.5.7


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