powerpc: Use helpers for rlimits

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: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: linuxppc-dev@ozlabs.org
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 3 insertions, 3 deletions

diff --git a/arch/powerpc/mm/mmap_64.c b/arch/powerpc/mm/mmap_64.c
index 0d957a4c70fe..5a783d8e8e8e 100644
--- a/arch/powerpc/mm/mmap_64.c
+++ b/arch/powerpc/mm/mmap_64.c
@@ -47,7 +47,7 @@ static inline int mmap_is_legacy(void)
         if (current->personality & ADDR_COMPAT_LAYOUT)
                 return 1;
 
-        if (current->signal->rlim[RLIMIT_STACK].rlim_cur == RLIM_INFINITY)
+        if (rlimit(RLIMIT_STACK) == RLIM_INFINITY)
                 return 1;
 
         return sysctl_legacy_va_layout;
@@ -77,7 +77,7 @@ static unsigned long mmap_rnd(void)
 
 static inline unsigned long mmap_base(void)
 {
-        unsigned long gap = current->signal->rlim[RLIMIT_STACK].rlim_cur;
+        unsigned long gap = rlimit(RLIMIT_STACK);
 
         if (gap < MIN_GAP)
                 gap = MIN_GAP;
diff --git a/arch/powerpc/platforms/cell/spufs/coredump.c b/arch/powerpc/platforms/cell/spufs/coredump.c
index c4d4a19235e0..eea120229cdb 100644
--- a/arch/powerpc/platforms/cell/spufs/coredump.c
+++ b/arch/powerpc/platforms/cell/spufs/coredump.c
@@ -54,7 +54,7 @@ static ssize_t do_coredump_read(int num, struct spu_context *ctx, void *buffer,
  */
 static int spufs_dump_write(struct file *file, const void *addr, int nr, loff_t *foffset)
 {
-        unsigned long limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
+        unsigned long limit = rlimit(RLIMIT_CORE);
         ssize_t written;
 
         if (*foffset + nr > limit)