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[78.145.97.89]) by smtp.gmail.com with ESMTPSA id r42-20020a05600c322a00b00380dc2e0d63sm8237627wmp.1.2022.02.26.04.39.20 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Sat, 26 Feb 2022 04:39:20 -0800 (PST) Date: Sat, 26 Feb 2022 12:39:18 +0000 From: Sudip Mukherjee To: Arnd Bergmann Cc: Daniel Vetter , Javier Martinez Canillas , Jani Nikula , Linus Torvalds , linux-kernel@vger.kernel.org Subject: regression: Build failure of mainline kernel with qcom_defconfig Message-ID: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Hi Arnd, All, We recently noticed that arm "qcom_defconfig" failed to build with the error: arm-linux-gnueabi-ld: drivers/gpu/drm/panel/panel-edp.o: in function `panel_edp_probe': drivers/gpu/drm/panel/panel-edp.c:843: undefined reference to `drm_panel_dp_aux_backlight' I have done a bisect and it points to: 9d6366e743f3 ("drm: fb_helper: improve CONFIG_FB dependency") Here is the complete bisect log: # bad: [df0cc57e057f18e44dac8e6c18aba47ab53202f9] Linux 5.16 # good: [8bb7eca972ad531c9b149c0a51ab43a417385813] Linux 5.15 git bisect start 'v5.16' 'v5.15' # good: [2219b0ceefe835b92a8a74a73fe964aa052742a2] Merge tag 'soc-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/soc/soc git bisect good 2219b0ceefe835b92a8a74a73fe964aa052742a2 # good: [206825f50f908771934e1fba2bfc2e1f1138b36a] Merge tag 'mtd/for-5.16' of git://git.kernel.org/pub/scm/linux/kernel/git/mtd/linux git bisect good 206825f50f908771934e1fba2bfc2e1f1138b36a # bad: [4e1fddc98d2585ddd4792b5e44433dcee7ece001] tcp_cubic: fix spurious Hystart ACK train detections for not-cwnd-limited flows git bisect bad 4e1fddc98d2585ddd4792b5e44433dcee7ece001 # good: [dbf49896187fd58c577fa1574a338e4f3672b4b2] Merge branch 'akpm' (patches from Andrew) git bisect good dbf49896187fd58c577fa1574a338e4f3672b4b2 # bad: [0ecca62beb12eeb13965ed602905c8bf53ac93d0] Merge tag 'ceph-for-5.16-rc1' of git://github.com/ceph/ceph-client git bisect bad 0ecca62beb12eeb13965ed602905c8bf53ac93d0 # bad: [304ac8032d3fa2d37750969cd4b8d5736a1829d9] Merge tag 'drm-next-2021-11-12' of git://anongit.freedesktop.org/drm/drm git bisect bad 304ac8032d3fa2d37750969cd4b8d5736a1829d9 # good: [f78e9de80f5ad15719a069a4e6c11e2777122188] Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/dtor/input git bisect good f78e9de80f5ad15719a069a4e6c11e2777122188 # good: [806acd381960008700c15c3dc616d578e9558853] Merge tag 'amd-drm-fixes-5.16-2021-11-03' of https://gitlab.freedesktop.org/agd5f/linux into drm-next git bisect good 806acd381960008700c15c3dc616d578e9558853 # bad: [f8ca7b74192b2e64bdfb89fb63c1d33b92bc899d] Merge tag 'drm-misc-next-fixes-2021-11-10' of git://anongit.freedesktop.org/drm/drm-misc into drm-next git bisect bad f8ca7b74192b2e64bdfb89fb63c1d33b92bc899d # good: [cecbc0c7eba7983965cac94f88d2db00b913253b] drm/i915/hdmi: Turn DP++ TMDS output buffers back on in encoder->shutdown() git bisect good cecbc0c7eba7983965cac94f88d2db00b913253b # bad: [14d9a37c952588930d7226953359fea3ab956d39] Revert "drm/imx: Annotate dma-fence critical section in commit path" git bisect bad 14d9a37c952588930d7226953359fea3ab956d39 # good: [5591c8f79db1729d9c5ac7f5b4d3a5c26e262d93] drm/udl: fix control-message timeout git bisect good 5591c8f79db1729d9c5ac7f5b4d3a5c26e262d93 # bad: [9d6366e743f37d36ef69347924ead7bcc596076e] drm: fb_helper: improve CONFIG_FB dependency git bisect bad 9d6366e743f37d36ef69347924ead7bcc596076e # good: [e0e6d1ea18c804de51b47fa65092c4cf2000604c] MAINTAINERS: dri-devel is for all of drivers/gpu git bisect good e0e6d1ea18c804de51b47fa65092c4cf2000604c # first bad commit: [9d6366e743f37d36ef69347924ead7bcc596076e] drm: fb_helper: improve CONFIG_FB dependency And, indeed reverting "9d6366e743f37d36ef69347924ead7bcc596076e" on top of 9137eda53752 ("Merge tag 'configfs-5.17-2022-02-25' of git://git.infradead.org/users/hch/configfs") fixes the build. I will be happy to test any patch fxing this issue. -- Regards Sudip