From: "Luis R. Rodriguez" <mcg...@suse.com> What started off as a witch hunt for a solution to the systemd kernel-module-loading-timeout-and-it-killing-drivers-issue (TM) ended up in our last discussions [0] agreement for us to add to the kernel what systemd expected us to be doing: asynchronous probing.
This implements support for that, but please note that upon further inspection of what the timeout is doing and implicating (documented on patch number 5 in this series) its also recommended that systemd revisit its timeout and perhaps consider simply not killing kmod workers. Even if the killing goes away this framework can still be desirable, and its expected this will be expanded to support built-in drivers as well later. This goes build tested with allmodconfig, and run time tested with and without bus.safe_mod_async_probe=1 on 4 different systems. As noted on patch #5 systemd should not use bus.safe_mod_async_probe=1 but instead issue a request per module so that in other cases where its not advisable to use async probe (also documented on patch #5) it can avoid it. We also enable a flag to let drivers specify if they never want to enable async probe for whatever reason and an example is provided on how to do this. This should have 0 impact unless userspace is issuing the module parameter for modules, or if any of the new module parameters are used to help test things. [0] https://lkml.org/lkml/2014/9/12/625 Luis R. Rodriguez (5): module: add extra argument for parse_params() callback driver-core: enable drivers to opt-out of async probe amd64_edac: enforce synchronous probe driver-core: generalize freeing driver private member driver-core: add driver asynchronous probe support arch/powerpc/mm/hugetlbpage.c | 4 +- drivers/base/base.h | 6 ++ drivers/base/bus.c | 150 ++++++++++++++++++++++++++++++++++++++++-- drivers/base/dd.c | 7 ++ drivers/edac/amd64_edac.c | 1 + include/linux/device.h | 5 ++ include/linux/module.h | 2 + include/linux/moduleparam.h | 3 +- init/main.c | 25 ++++--- kernel/module.c | 16 ++++- kernel/params.c | 11 ++-- lib/dynamic_debug.c | 4 +- 12 files changed, 206 insertions(+), 28 deletions(-) -- 2.1.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
