[PATCH] powerpc/signal64: Don't opencode page prefaulting

[Christophe Leroy]

Instead of doing a __get_user() from the first and last location
into a tmp var which won't be used, use fault_in_pages_readable()

Signed-off-by: Christophe Leroy <christophe.le...@csgroup.eu>
---
 arch/powerpc/kernel/signal_64.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/arch/powerpc/kernel/signal_64.c b/arch/powerpc/kernel/signal_64.c
index 55e5f76554da..c451c47538e1 100644
--- a/arch/powerpc/kernel/signal_64.c
+++ b/arch/powerpc/kernel/signal_64.c
@@ -21,6 +21,7 @@
 #include <linux/ptrace.h>
 #include <linux/ratelimit.h>
 #include <linux/syscalls.h>
+#include <linux/pagemap.h>
 
 #include <asm/sigcontext.h>
 #include <asm/ucontext.h>
@@ -632,7 +633,6 @@ static long setup_trampoline(unsigned int syscall, unsigned 
int __user *tramp)
 SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, old_ctx,
                struct ucontext __user *, new_ctx, long, ctx_size)
 {
-       unsigned char tmp;
        sigset_t set;
        unsigned long new_msr = 0;
        int ctx_has_vsx_region = 0;
@@ -667,9 +667,8 @@ SYSCALL_DEFINE3(swapcontext, struct ucontext __user *, 
old_ctx,
        }
        if (new_ctx == NULL)
                return 0;
-       if (!access_ok(new_ctx, ctx_size)
-           || __get_user(tmp, (u8 __user *) new_ctx)
-           || __get_user(tmp, (u8 __user *) new_ctx + ctx_size - 1))
+       if (!access_ok(new_ctx, ctx_size) ||
+           fault_in_pages_readable((u8 __user *)new_ctx, ctx_size))
                return -EFAULT;
 
        /*
-- 
2.25.0