powerpc/64: mark start_here_multiplatform as __ref [Linux 5.3]

This Linux kernel change "powerpc/64: mark start_here_multiplatform as __ref" is included in the Linux 5.3 release. This change is authored by Christophe Leroy <christophe.leroy [at] c-s.fr> on Fri May 10 06:31:28 2019 +0000. The commit for this change in Linux stable tree is 9c4e4c9 (patch).

powerpc/64: mark start_here_multiplatform as __ref

Otherwise, the following warning is encountered:

WARNING: vmlinux.o(.text+0x3dc6): Section mismatch in reference from the variable start_here_multiplatform to the function .init.text:.early_setup()
The function start_here_multiplatform() references
the function __init .early_setup().
This is often because start_here_multiplatform lacks a __init
annotation or the annotation of .early_setup is wrong.

Fixes: 56c46bba9bbf ("powerpc/64: Fix booting large kernels with STRICT_KERNEL_RWX")
Cc: Russell Currey <ruscur@russell.cc>
Signed-off-by: Christophe Leroy <christophe.leroy@c-s.fr>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

There are 2 lines of Linux source code added/deleted in this change. Code changes to Linux kernel are as follows.

 arch/powerpc/kernel/head_64.S | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index 5321a11..259be7f 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -904,6 +904,7 @@ p_toc:  .8byte  __toc_start + 0x8000 - 0b
 /*
  * This is where the main kernel code starts.
  */
+__REF
 start_here_multiplatform:
    /* set up the TOC */
    bl      relative_toc
@@ -979,6 +980,7 @@ start_here_multiplatform:
    RFI
    b   .   /* prevent speculative execution */

+   .previous
    /* This is where all platforms converge execution */

 start_here_common:

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