As reported by Andy, kernel-doc.py is creating a __pycache__
directory at build time.

Disable creation of __pycache__ for the libraries used by
kernel-doc.py, when excecuted via the build system or via
scripts/find-unused-docs.sh.

Reported-by: Andy Shevchenko <andriy.shevche...@intel.com>
Closes: https://lore.kernel.org/linux-doc/z_zyxajctd-c3...@black.fi.intel.com/
Signed-off-by: Mauro Carvalho Chehab <mchehab+hua...@kernel.org>
---
 drivers/gpu/drm/Makefile      | 2 +-
 drivers/gpu/drm/i915/Makefile | 2 +-
 include/drm/Makefile          | 2 +-
 scripts/find-unused-docs.sh   | 2 +-
 4 files changed, 4 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index ed54a546bbe2..1469d64f8783 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -236,7 +236,7 @@ always-$(CONFIG_DRM_HEADER_TEST) += \
 quiet_cmd_hdrtest = HDRTEST $(patsubst %.hdrtest,%.h,$@)
       cmd_hdrtest = \
                $(CC) $(c_flags) -fsyntax-only -x c /dev/null -include $< 
-include $<; \
-               $(srctree)/scripts/kernel-doc -none $(if 
$(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
+               $(KERNELDOC) PYTHONDONTWRITEBYTECODE=1 -none $(if 
$(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
                touch $@
 
 $(obj)/%.hdrtest: $(src)/%.h FORCE
diff --git a/drivers/gpu/drm/i915/Makefile b/drivers/gpu/drm/i915/Makefile
index ed05b131ed3a..bb873f9cc2aa 100644
--- a/drivers/gpu/drm/i915/Makefile
+++ b/drivers/gpu/drm/i915/Makefile
@@ -408,7 +408,7 @@ obj-$(CONFIG_DRM_I915_GVT_KVMGT) += kvmgt.o
 #
 # Enable locally for CONFIG_DRM_I915_WERROR=y. See also scripts/Makefile.build
 ifdef CONFIG_DRM_I915_WERROR
-    cmd_checkdoc = $(srctree)/scripts/kernel-doc -none -Werror $<
+    cmd_checkdoc = $(KERNELDOC) PYTHONDONTWRITEBYTECODE=1 -none -Werror $<
 endif
 
 # header test
diff --git a/include/drm/Makefile b/include/drm/Makefile
index a7bd15d2803e..6088ea458f44 100644
--- a/include/drm/Makefile
+++ b/include/drm/Makefile
@@ -11,7 +11,7 @@ always-$(CONFIG_DRM_HEADER_TEST) += \
 quiet_cmd_hdrtest = HDRTEST $(patsubst %.hdrtest,%.h,$@)
       cmd_hdrtest = \
                $(CC) $(c_flags) -fsyntax-only -x c /dev/null -include $< 
-include $<; \
-               $(srctree)/scripts/kernel-doc -none $(if 
$(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
+               $(KERNELDOC) PYTHONDONTWRITEBYTECODE=1 -none $(if 
$(CONFIG_WERROR)$(CONFIG_DRM_WERROR),-Werror) $<; \
                touch $@
 
 $(obj)/%.hdrtest: $(src)/%.h FORCE
diff --git a/scripts/find-unused-docs.sh b/scripts/find-unused-docs.sh
index ee6a50e33aba..d6d397fbf917 100755
--- a/scripts/find-unused-docs.sh
+++ b/scripts/find-unused-docs.sh
@@ -54,7 +54,7 @@ for file in `find $1 -name '*.c'`; do
        if [[ ${FILES_INCLUDED[$file]+_} ]]; then
        continue;
        fi
-       str=$(scripts/kernel-doc -export "$file" 2>/dev/null)
+       str=$(PYTHONDONTWRITEBYTECODE=1 scripts/kernel-doc -export "$file" 
2>/dev/null)
        if [[ -n "$str" ]]; then
        echo "$file"
        fi
-- 
2.49.0

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