powerpc: Don't use __put_user() in patch_instruction

patch_instruction() can be called very early on ppc32, when the kernel
isn't yet running at it's linked address. That can cause the !
is_kernel_addr() test in __put_user() to trip and call might_sleep()
which is very bad at that point during boot.

Use a lower level function instead for now, at least until we get to
rework ppc32 boot process to do the code patching later, like ppc64
does.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

diff --git a/arch/powerpc/lib/code-patching.c b/arch/powerpc/lib/code-patching.c
index dd223b3eb333ac3446725f0768d5da412000ba75..17e5b23643124347febe56a05f5deb7e1a2e361e 100644 (file)
--- a/arch/powerpc/lib/code-patching.c
+++ b/arch/powerpc/lib/code-patching.c
@@ -20,7 +20,7 @@ int patch_instruction(unsigned int *addr, unsigned int instr)
 {
        int err;
 
-       err = __put_user(instr, addr);
+       __put_user_size(instr, addr, 4, err);
        if (err)
                return err;
        asm ("dcbst 0, %0; sync; icbi 0,%0; sync; isync" : : "r" (addr));