Pull thermal into release branch

[linux-drm-fsl-dcu.git] / arch / powerpc / kernel / signal_32.c

diff --git a/arch/powerpc/kernel/signal_32.c b/arch/powerpc/kernel/signal_32.c
index e4ebe1a6228e5e9a9ad32da2dd7f601f5f6afc61..dd1dca5bfa81fbebfbce7bcf1e2b1a72842e3a9b 100644 (file)
--- a/arch/powerpc/kernel/signal_32.c
+++ b/arch/powerpc/kernel/signal_32.c
@@ -20,7 +20,6 @@
 #include <linux/sched.h>
 #include <linux/mm.h>
 #include <linux/smp.h>
-#include <linux/smp_lock.h>
 #include <linux/kernel.h>
 #include <linux/signal.h>
 #include <linux/errno.h>
@@ -835,11 +834,21 @@ long sys_swapcontext(struct ucontext __user *old_ctx,
                return -EINVAL;
 
        if (old_ctx != NULL) {
+               struct mcontext __user *mctx;
+
+               /*
+                * old_ctx might not be 16-byte aligned, in which
+                * case old_ctx->uc_mcontext won't be either.
+                * Because we have the old_ctx->uc_pad2 field
+                * before old_ctx->uc_mcontext, we need to round down
+                * from &old_ctx->uc_mcontext to a 16-byte boundary.
+                */
+               mctx = (struct mcontext __user *)
+                       ((unsigned long) &old_ctx->uc_mcontext & ~0xfUL);
                if (!access_ok(VERIFY_WRITE, old_ctx, sizeof(*old_ctx))
-                   || save_user_regs(regs, &old_ctx->uc_mcontext, 0)
+                   || save_user_regs(regs, mctx, 0)
                    || put_sigset_t(&old_ctx->uc_sigmask, &current->blocked)
-                   || __put_user(to_user_ptr(&old_ctx->uc_mcontext),
-                           &old_ctx->uc_regs))
+                   || __put_user(to_user_ptr(mctx), &old_ctx->uc_regs))
                        return -EFAULT;
        }
        if (new_ctx == NULL)