parisc: Prevent booting 64-bit kernels on PA1.x machines

commit a406b8b424fa01f244c1aab02ba186258448c36b upstream.

Bail out early with error message when trying to boot a 64-bit kernel on
32-bit machines. This fixes the previous commit to include the check for
true 64-bit kernels as well.

Signed-off-by: Helge Deller <deller@gmx.de>
Fixes: 591d2108f3abc ("parisc: Add runtime check to prevent PA2.0 kernels on PA1.x machines")
Cc:  <stable@vger.kernel.org> # v6.0+
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/parisc/kernel/head.S b/arch/parisc/kernel/head.S
index a171bf3..96e0264 100644 (file)
--- a/arch/parisc/kernel/head.S
+++ b/arch/parisc/kernel/head.S
@@ -70,9 +70,8 @@ $bss_loop:
        stw,ma          %arg2,4(%r1)
        stw,ma          %arg3,4(%r1)
 
-#if !defined(CONFIG_64BIT) && defined(CONFIG_PA20)
-       /* This 32-bit kernel was compiled for PA2.0 CPUs. Check current CPU
-        * and halt kernel if we detect a PA1.x CPU. */
+#if defined(CONFIG_PA20)
+       /* check for 64-bit capable CPU as required by current kernel */
        ldi             32,%r10
        mtctl           %r10,%cr11
        .level 2.0