It is good to update to "Fred" (Xin Wei) off-line and thank you very much for it.
On Tue, Jan 23, 2018 at 8:46 AM, Daniel Axtens <daniel.axt...@canonical.com> wrote: > I have talked to the kernel team about this and updated Fred off-line. > > -- > You received this bug notification because you are subscribed to the bug > report. > https://bugs.launchpad.net/bugs/1738334 > > Title: > hisilicon hibmc regression due to ea642c3216cb ("drm/ttm: add > io_mem_pfn callback") > > Status in linux package in Ubuntu: > Confirmed > > Bug description: > [SRU Justification] > > [Impact] > On Artful kernels, X fails to start and a kernel splat is printed. > > This is cbecause ea642c3216cb ("drm/ttm: add io_mem_pfn callback") is > incomplete: the hisilicon hibmc driver does not contain the callback > and so the kernel tries to execute code at NULL. > > [Fix] > There is a discussion and potential fix at > https://lists.freedesktop.org/archives/dri-devel/2017-November/159002.html > The fix hasn't landed yet and it looks like they're going to re-engineer > the entire section instead. > > Rather than wait for that and deal with the massive regression > potential, the fix I have picked to submit is very very minimal and > touches only hibmc. > > [Regression Potential] > Minimal - fix only touches hibmc driver. Tested on D05 board. > > [Testcase] > Install patched kernel, try to start X. If it succeeds, the fix works. > If there's a kernel splat, the fix does not work. > > [Notes] > HiSilicon would really like this fix in Artful in such time so that when > the next 16.04 point release ships in February, the HWE kernel will work > with Xorg. > > To manage notifications about this bug go to: > https://bugs.launchpad.net/ubuntu/+source/linux/+bug/ > 1738334/+subscriptions > -- Zhanglei Mao Solutions Architect, Sales and Business Development Canonical Group Ltd. zhanglei....@canonical.com +86-13625010929 (m) +852-6700 6026 (m) www.ubuntu.com www.canonical.com -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1738334 Title: hisilicon hibmc regression due to ea642c3216cb ("drm/ttm: add io_mem_pfn callback") Status in linux package in Ubuntu: Confirmed Bug description: [SRU Justification] [Impact] On Artful kernels, X fails to start and a kernel splat is printed. This is cbecause ea642c3216cb ("drm/ttm: add io_mem_pfn callback") is incomplete: the hisilicon hibmc driver does not contain the callback and so the kernel tries to execute code at NULL. [Fix] There is a discussion and potential fix at https://lists.freedesktop.org/archives/dri-devel/2017-November/159002.html The fix hasn't landed yet and it looks like they're going to re-engineer the entire section instead. Rather than wait for that and deal with the massive regression potential, the fix I have picked to submit is very very minimal and touches only hibmc. [Regression Potential] Minimal - fix only touches hibmc driver. Tested on D05 board. [Testcase] Install patched kernel, try to start X. If it succeeds, the fix works. If there's a kernel splat, the fix does not work. [Notes] HiSilicon would really like this fix in Artful in such time so that when the next 16.04 point release ships in February, the HWE kernel will work with Xorg. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1738334/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
