As reported by Sphinx:

        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:1147: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_oa_wait_unlocked'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:1169: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_oa_poll_wait'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:1189: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_oa_read'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:2669: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_oa_stream_enable'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:2734: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_oa_stream_disable'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:2820: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_oa_stream_init'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3010: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_read'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3098: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_poll_locked'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3129: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_poll'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3152: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_enable_locked'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3181: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_disable_locked'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3273: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_ioctl'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3296: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_destroy_locked'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3321: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_release'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3379: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_open_ioctl_locked'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3534: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'read_properties_unlocked'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3717: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_open_ioctl'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3760: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_register'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:3789: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_unregister'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:4009: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_add_config_ioctl'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:4162: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_remove_config_ioctl'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:4260: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_init'.
        ./Documentation/gpu/i915:646: ./drivers/gpu/drm/i915/i915_perf.c:4423: 
WARNING: Duplicate C declaration, also defined in 'gpu/i915'.
        Declaration is 'i915_perf_fini'.

With Sphinx 3, C declarations can't be duplicated anymore,
so let's exclude those from the other internals found on
i915_perf.c file.

Signed-off-by: Mauro Carvalho Chehab <mchehab+hua...@kernel.org>
---
 Documentation/gpu/i915.rst | 29 +++++++++++++++++++++++++----
 1 file changed, 25 insertions(+), 4 deletions(-)

diff --git a/Documentation/gpu/i915.rst b/Documentation/gpu/i915.rst
index 33cc6ddf8f64..cff1f154b473 100644
--- a/Documentation/gpu/i915.rst
+++ b/Documentation/gpu/i915.rst
@@ -636,15 +636,36 @@ i915 Perf Observation Architecture Stream
 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
    :functions: i915_oa_poll_wait
 
-All i915 Perf Internals
------------------------
+Other i915 Perf Internals
+-------------------------
 
-This section simply includes all currently documented i915 perf internals, in
-no particular order, but may include some more minor utilities or platform
+This section simply includes all other currently documented i915 perf 
internals,
+in no particular order, but may include some more minor utilities or platform
 specific details than found in the more high-level sections.
 
 .. kernel-doc:: drivers/gpu/drm/i915/i915_perf.c
    :internal:
+   :no-identifiers:
+       i915_perf_init
+       i915_perf_fini
+       i915_perf_register
+       i915_perf_unregister
+       i915_perf_open_ioctl
+       i915_perf_release
+       i915_perf_add_config_ioctl
+       i915_perf_remove_config_ioctl
+       read_properties_unlocked
+       i915_perf_open_ioctl_locked
+       i915_perf_destroy_locked
+       i915_perf_read i915_perf_ioctl
+       i915_perf_enable_locked
+       i915_perf_disable_locked
+       i915_perf_poll i915_perf_poll_locked
+       i915_oa_stream_init i915_oa_read
+       i915_oa_stream_enable
+       i915_oa_stream_disable
+       i915_oa_wait_unlocked
+       i915_oa_poll_wait
 
 Style
 =====
-- 
2.26.2

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