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Sun, 09 Mar 2025 15:20:05 +0100 Message-ID: Date: Sun, 9 Mar 2025 15:20:04 +0100 Precedence: bulk X-Mailing-List: linux-fbdev@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 1/1] fbdev: hyperv_fb: Fix hang in kdump kernel when on Hyper-V Gen 2 VMs To: Michael Kelley , "wei.liu@kernel.org" Cc: "dri-devel@lists.freedesktop.org" , "linux-fbdev@vger.kernel.org" , "linux-kernel@vger.kernel.org" , "linux-hyperv@vger.kernel.org" References: <20250218230130.3207-1-mhklinux@outlook.com> <24668c7d-6333-423e-bd48-28af1431b263@gmx.de> Content-Language: en-US From: Helge Deller Autocrypt: addr=deller@gmx.de; keydata= xsFNBF3Ia3MBEAD3nmWzMgQByYAWnb9cNqspnkb2GLVKzhoH2QD4eRpyDLA/3smlClbeKkWT HLnjgkbPFDmcmCz5V0Wv1mKYRClAHPCIBIJgyICqqUZo2qGmKstUx3pFAiztlXBANpRECgwJ r+8w6mkccOM9GhoPU0vMaD/UVJcJQzvrxVHO8EHS36aUkjKd6cOpdVbCt3qx8cEhCmaFEO6u CL+k5AZQoABbFQEBocZE1/lSYzaHkcHrjn4cQjc3CffXnUVYwlo8EYOtAHgMDC39s9a7S90L 69l6G73lYBD/Br5lnDPlG6dKfGFZZpQ1h8/x+Qz366Ojfq9MuuRJg7ZQpe6foiOtqwKym/zV dVvSdOOc5sHSpfwu5+BVAAyBd6hw4NddlAQUjHSRs3zJ9OfrEx2d3mIfXZ7+pMhZ7qX0Axlq Lq+B5cfLpzkPAgKn11tfXFxP+hcPHIts0bnDz4EEp+HraW+oRCH2m57Y9zhcJTOJaLw4YpTY GRUlF076vZ2Hz/xMEvIJddRGId7UXZgH9a32NDf+BUjWEZvFt1wFSW1r7zb7oGCwZMy2LI/G aHQv/N0NeFMd28z+deyxd0k1CGefHJuJcOJDVtcE1rGQ43aDhWSpXvXKDj42vFD2We6uIo9D 1VNre2+uAxFzqqf026H6cH8hin9Vnx7p3uq3Dka/Y/qmRFnKVQARAQABzRxIZWxnZSBEZWxs ZXIgPGRlbGxlckBnbXguZGU+wsGRBBMBCAA7AhsDBQsJCAcCBhUKCQgLAgQWAgMBAh4BAheA FiEERUSCKCzZENvvPSX4Pl89BKeiRgMFAl3J1zsCGQEACgkQPl89BKeiRgNK7xAAg6kJTPje uBm9PJTUxXaoaLJFXbYdSPfXhqX/BI9Xi2VzhwC2nSmizdFbeobQBTtRIz5LPhjk95t11q0s uP5htzNISPpwxiYZGKrNnXfcPlziI2bUtlz4ke34cLK6MIl1kbS0/kJBxhiXyvyTWk2JmkMi REjR84lCMAoJd1OM9XGFOg94BT5aLlEKFcld9qj7B4UFpma8RbRUpUWdo0omAEgrnhaKJwV8 qt0ULaF/kyP5qbI8iA2PAvIjq73dA4LNKdMFPG7Rw8yITQ1Vi0DlDgDT2RLvKxEQC0o3C6O4 iQq7qamsThLK0JSDRdLDnq6Phv+Yahd7sDMYuk3gIdoyczRkXzncWAYq7XTWl7nZYBVXG1D8 gkdclsnHzEKpTQIzn/rGyZshsjL4pxVUIpw/vdfx8oNRLKj7iduf11g2kFP71e9v2PP94ik3 Xi9oszP+fP770J0B8QM8w745BrcQm41SsILjArK+5mMHrYhM4ZFN7aipK3UXDNs3vjN+t0zi qErzlrxXtsX4J6nqjs/mF9frVkpv7OTAzj7pjFHv0Bu8pRm4AyW6Y5/H6jOup6nkJdP/AFDu 5ImdlA0jhr3iLk9s9WnjBUHyMYu+HD7qR3yhX6uWxg2oB2FWVMRLXbPEt2hRGq09rVQS7DBy dbZgPwou7pD8MTfQhGmDJFKm2jvOwU0EXchrcwEQAOsDQjdtPeaRt8EP2pc8tG+g9eiiX9Sh rX87SLSeKF6uHpEJ3VbhafIU6A7hy7RcIJnQz0hEUdXjH774B8YD3JKnAtfAyuIU2/rOGa/v UN4BY6U6TVIOv9piVQByBthGQh4YHhePSKtPzK9Pv/6rd8H3IWnJK/dXiUDQllkedrENXrZp eLUjhyp94ooo9XqRl44YqlsrSUh+BzW7wqwfmu26UjmAzIZYVCPCq5IjD96QrhLf6naY6En3 ++tqCAWPkqKvWfRdXPOz4GK08uhcBp3jZHTVkcbo5qahVpv8Y8mzOvSIAxnIjb+cklVxjyY9 dVlrhfKiK5L+zA2fWUreVBqLs1SjfHm5OGuQ2qqzVcMYJGH/uisJn22VXB1c48yYyGv2HUN5 lC1JHQUV9734I5cczA2Gfo27nTHy3zANj4hy+s/q1adzvn7hMokU7OehwKrNXafFfwWVK3OG 1dSjWtgIv5KJi1XZk5TV6JlPZSqj4D8pUwIx3KSp0cD7xTEZATRfc47Yc+cyKcXG034tNEAc xZNTR1kMi9njdxc1wzM9T6pspTtA0vuD3ee94Dg+nDrH1As24uwfFLguiILPzpl0kLaPYYgB wumlL2nGcB6RVRRFMiAS5uOTEk+sJ/tRiQwO3K8vmaECaNJRfJC7weH+jww1Dzo0f1TP6rUa fTBRABEBAAHCwXYEGAEIACAWIQRFRIIoLNkQ2+89Jfg+Xz0Ep6JGAwUCXchrcwIbDAAKCRA+ Xz0Ep6JGAxtdEAC54NQMBwjUNqBNCMsh6WrwQwbg9tkJw718QHPw43gKFSxFIYzdBzD/YMPH l+2fFiefvmI4uNDjlyCITGSM+T6b8cA7YAKvZhzJyJSS7pRzsIKGjhk7zADL1+PJei9p9idy RbmFKo0dAL+ac0t/EZULHGPuIiavWLgwYLVoUEBwz86ZtEtVmDmEsj8ryWw75ZIarNDhV74s BdM2ffUJk3+vWe25BPcJiaZkTuFt+xt2CdbvpZv3IPrEkp9GAKof2hHdFCRKMtgxBo8Kao6p Ws/Vv68FusAi94ySuZT3fp1xGWWf5+1jX4ylC//w0Rj85QihTpA2MylORUNFvH0MRJx4mlFk XN6G+5jIIJhG46LUucQ28+VyEDNcGL3tarnkw8ngEhAbnvMJ2RTx8vGh7PssKaGzAUmNNZiG MB4mPKqvDZ02j1wp7vthQcOEg08z1+XHXb8ZZKST7yTVa5P89JymGE8CBGdQaAXnqYK3/yWf FwRDcGV6nxanxZGKEkSHHOm8jHwvQWvPP73pvuPBEPtKGLzbgd7OOcGZWtq2hNC6cRtsRdDx 4TAGMCz4j238m+2mdbdhRh3iBnWT5yPFfnv/2IjFAk+sdix1Mrr+LIDF++kiekeq0yUpDdc4 ExBy2xf6dd+tuFFBp3/VDN4U0UfG4QJ2fg19zE5Z8dS4jGIbLg== In-Reply-To: Content-Type: text/plain; charset=UTF-8; format=flowed Content-Transfer-Encoding: quoted-printable X-Provags-ID: V03:K1:l70lS2fMfJxjdlphzMlS2nvWxd1I98pF1dIsGqawjoEGjZG074S khIHmH+AlgLRErba8t9RP9JTC5pGBidh7FK3p14ISZLtVb8fWeqH6135L/MGk1I9UwfNiFs 6220HUhpOK3Bz2BOP5v263T6BJ4Aq81uP9fgkkzHcBz1eoO+KCFXRERhyNtNUrbR6Xzh7EF LglDCD1Qzfe82z3JT2qaA== X-Spam-Flag: NO UI-OutboundReport: notjunk:1;M01:P0:vGdK+Z0kilA=;JpL4QeABnVv/sJkRK/eOzZB/e01 ujDrvqwQW/2bvgvZv7JeEERECgFMRWMtjHcAgSACL0xZTg2BLSK+LT6ZQW0gNtXrmuTnH9ZJE AjiG2cqorPObhYkJezlwFL6ybt+kUGppLMrLd/vdxdFGR0fVutbFqaZ3U5Dkx9VRj1Tz5t6Jg dJf8tX0qgZWrMVBtTiylSopy8yPwL3keK/PivD7tdKPe5dg1RCOfK+hyx+Gfnb0Ow3cQ17XQw vJ9ddt7cyyMjWpsyuIx1uNo3V/KlRlJug/IoW6CD4/gcQna4fdl+xEIfWeN7IrRBmNj+l59ab Rdp5TO3e07uhSoGg2c0PyyyuduRakXJQcjpEBZ0KFCCyfl2BBg1hqJyCOmUGccunY7npUI2fQ wZ+ZkoPZc1xhPB3AKamUDSvB88kCOH9qk/a5xFDugoKcb1EZGgPwJBXtGc6/Eqe6BI1HxKVtU qXpw6ra5ETZDg4C3wkEZCet6/GCvTgToGpZU+eHybNpXlGT8IlyA7k9805sIXocmYNBD9CHfI VRiCR2Dd7vf5OkAoWZMHh1c5F49j+L1kIum86g4OYgukvHXypFV6HWqEJOP+oH0cjDUKwQCmN ak2Cb8pd2eU/Oxv9Kz0yZd/7ZAy7lxd+IWMdhKl49QXO01cwkdq9Pkv2spUiYrLejPsJsreX4 C5x+miIBEApKsaLTj1M8ixWwngzAJk2VkEWZ7zZZGp3ndvKdCKXBqrfdsBMo3aJfMRT8z6bCR FFRHqrCZJtpE/ckmihawGSxU/sSDD97LpyXBMTSN+Fwb4N6WhOqrwPU+wFbJZGIoxow8W30cF jodnkbX4Xkk639vniL2Qz1klgpn/um4y1NKKM8/HyVdwQZMMnzVP4Ny0j/Jegdu3JscpO1bpQ 7CYFW9uqF7Dgyq0lP85wDzmh14wJKWCw1j7bpvH1RWNHpRnwjxTWf06mPyFTCSkoVdQrqEg6K 8ktzMyQWkX/Jk1tMTKsBHEWS7TObHSTwhqaBJ4kO06sIIKt8FNJ2zhNwdZMFBQITlsS/EJYrq Bt6BOqN20zIxAj3/ZCeN4axRseBkWXLHimztF5uwgYBzjkh0pc80aYmGIgL7Bq3XzOc4/iAyC n1Jb9+gv7SG1htI13IdgNOff+CJbxinPJgMbRycwoz07SUCX3PPlzd8FsDH5z0DEyKDLgeGJQ VPwYPWB3DowGSgqtm7DEdSCnpAqOetKLj6t/yKHmh5NV3yhR3jBDRq2fFTXuzOVEQoORYLnfv eUvTogLQdSePYu0fcgIhDmVnPelEm7hglYi1DXwnFPVA094Scd7K9/BhvDAg3Mc+Lukj9Zq1I oQ+TOngX9XXXIo6ZzjO8uPcxhHsxBUFoiG+DRYWv88AFSwYUfBiUZHEueuqJXoROdy/NeLcbe ASjsQ7Vmj86qrjyYN+eXd+tCbcpyIHgrQ7JiRsmsz/LIBl0mPkL3pQojUz73Gqli3owuqJDSF k9FInNg== On 3/9/25 05:10, Michael Kelley wrote: > From: Helge Deller Sent: Saturday, March 8, 2025 6:59 PM >> >> On 2/19/25 00:01, mhkelley58@gmail.com wrote: >>> From: Michael Kelley >>> > [snip] > >>> >>> Reported-by: Thomas Tai >>> Fixes: c25a19afb81c ("fbdev/hyperv_fb: Do not clear global screen_info= ") >>> Signed-off-by: Michael Kelley >>> --- >>> The "Fixes" tag uses commit c25a19afb81c because that's where the prob= lem >>> was re-exposed, and how far back a stable backport is needed. But I've >>> taken a completely different, and hopefully better, approach in the >>> solution that isn't related to the code changes in c25a19afb81c. >>> >>> drivers/video/fbdev/hyperv_fb.c | 20 +++++++++++++------- >>> 1 file changed, 13 insertions(+), 7 deletions(-) >> >> applied to fbdev tree. >> > > Thank you! > > Related, I noticed the patch "fbdev: hyperv_fb: iounmap() the correct > memory when removing a device" is also in the fbdev for-next branch. > Wei Liu previously applied this patch to the hyperv-fixes tree (see [1]) > and it's already in linux-next. Won't having it also in fbdev produce a > merge conflict? > [1] https://lore.kernel.org/linux-hyperv/Z6wHDw8BssJyQHiM@liuwe-devbox-d= ebian-v2/ Thanks Michael! I now dropped that patch from the fbdev tree to avoid collisions. Btw, I'm fine if we agree that all hyperv-fbdev fixes & patches go through hyperv or other trees. Just let me know. Helge