kernel-devsrc: copy arch/powerpc/tools contents

For now, using qemuppc64 as MACHINE and building things inside SDK,
we'll get the following error:

  ERROR: modpost: "_mcount" undefined

This is because after [1], MPROFILE_KERNEL is using arch/powerpc/tools/
contents to do the check. This in turn affects HAVE_OBJTOOL.
"""
arch/powerpc/Kconfig:   select HAVE_OBJTOOL                     if ARCH_USING_PATCHABLE_FUNCTION_ENTRY || MPROFILE_KERNEL || PPC32
"""

The current MPROFILE_KERNEL for powerpc:
"""
config MPROFILE_KERNEL
            depends on PPC64_ELF_ABI_V2 && FUNCTION_TRACER
            def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mlittle-endian) if CPU_LITTLE_ENDIAN
            def_bool $(success,$(srctree)/arch/powerpc/tools/gcc-check-mprofile-kernel.sh $(CC) -mbig-endian) if CPU_BIG_ENDIAN
"""

If MPROFILE_KERNEL is disabled, thus HAVE_OBJTOOL being disabled, then
FTRACE_MCOUNT_USE_RECORDMCOUNT will be enabled, causing this error.

The scripts are listed and copied one by one. Their names and the reasons why
they are copied are as below:
  gcc-check-mprofile-kernel.sh: needed by MPROFILE_KERNEL
  gcc-check-fpatchable-function-entry.sh: needed by ARCH_USING_PATCHABLE_FUNCTION_ENTRY
  head_check.sh/relocs_check.sh/unrel_branch_check.sh: needed by Makefile.postlink

[1] https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=abba759796f9b73eb24df9b734dd063839fc62e0

Signed-off-by: Chen Qi <Qi.Chen@windriver.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>

diff --git a/meta/recipes-kernel/linux/kernel-devsrc.bb b/meta/recipes-kernel/linux/kernel-devsrc.bb
index 0dc97724290147a73227c0caa629c1a611dfbb07..04dd683dde27402f3c230fe2ca5881c452bdb447 100644 (file)
--- a/meta/recipes-kernel/linux/kernel-devsrc.bb
+++ b/meta/recipes-kernel/linux/kernel-devsrc.bb
@@ -208,6 +208,13 @@ do_install() {
         fi
 
         if [ "${ARCH}" = "powerpc" ]; then
+            # Copy scripts that are needed by powperpc build, but don't error if they aren't present in the source.
+            # 4.18+ needs gcc-check-mprofile-kernel.sh for MPROFILE_KERNEL, for example.
+            # See https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=abba759796f9b73eb24df9b734dd063839fc62e0
+            for script in gcc-check-mprofile-kernel.sh gcc-check-fpatchable-function-entry.sh head_check.sh relocs_check.sh unrel_branch_check.sh; do
+                cp -a --parents arch/powerpc/tools/$script $kerneldir/build/ 2>/dev/null || :
+            done
+
             # 5.0 needs these files, but don't error if they aren't present in the source
             cp -a --parents arch/${ARCH}/kernel/syscalls/syscall.tbl $kerneldir/build/ 2>/dev/null || :
             cp -a --parents arch/${ARCH}/kernel/syscalls/syscalltbl.sh $kerneldir/build/ 2>/dev/null || :