From: Dan Williams <dan.j.williams@intel.com>
To: Borislav Petkov <bp@alien8.de>,
Jonathan Cameron <Jonathan.Cameron@huawei.com>
Cc: Shiju Jose <shiju.jose@huawei.com>,
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Dmitry Torokhov <dmitry.torokhov@gmail.com>
Subject: Re: [RFC PATCH v8 01/10] ras: scrub: Add scrub subsystem
Date: Thu, 9 May 2024 14:21:28 -0700 [thread overview]
Message-ID: <663d3e58a0f73_1c0a1929487@dwillia2-xfh.jf.intel.com.notmuch> (raw)
In-Reply-To: <20240509200306.GAZj0r-h5Tnc0ecIOz@fat_crate.local>
Borislav Petkov wrote:
> On Thu, May 09, 2024 at 05:52:18PM +0200, Borislav Petkov wrote:
> > Are you arguing for the nonsensical "it should load" case because it
> > is simply easier this way? How hard is that "jump through hoops" thing
> > anyway?
>
> Let's see: the following patches add something called
> GET_SUPPORTED_FEATURES which is used to detect whether the system has
> patrol scrub functionality etc.
>
> Then there's ras2_acpi_init() which checks for a RAS2 ACPI table.
>
> Are you saying that checking for those two things in the init function
> is jumping through hoops?
Wait, this discussion has gone off the rails.
Recall that there are 461 usages of module_pci_driver() in the kernel.
Every one of those arranges for just registering a PCI driver when the
module is loaded regardless of whether any devices that driver cares
about are present.
Consider the case of the PCI subsystem that allows dynamically updating
the device ids that a driver attaches. I.e.
echo $id > /sys/bus/pci/drivers/$driver/new_id
...the fundamentally does not work if the module unloads itself and the
driver(s) it registers when the PCI bus core finds no devices to attach
at runtime.
The mitigation for keeping unneeded modules unloaded is that udev does
not autoload modules unless a PCI bus udev event matches a module's
published PCI device table.
Don't want to waste module memory? Don't load the module.
next prev parent reply other threads:[~2024-05-09 21:21 UTC|newest]
Thread overview: 54+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-04-19 16:47 [RFC PATCH v8 00/10] ras: scrub: introduce subsystem + CXL/ACPI-RAS2 drivers shiju.jose
2024-04-19 16:47 ` [RFC PATCH v8 01/10] ras: scrub: Add scrub subsystem shiju.jose
2024-04-24 20:25 ` fan
2024-04-25 10:38 ` Shiju Jose
2024-04-25 10:15 ` Borislav Petkov
2024-04-25 18:11 ` Shiju Jose
2024-05-06 10:30 ` Borislav Petkov
2024-05-08 16:59 ` Shiju Jose
2024-05-08 17:20 ` Borislav Petkov
2024-05-08 17:44 ` Shiju Jose
2024-05-08 19:25 ` Borislav Petkov
2024-05-09 9:19 ` Jonathan Cameron
2024-05-09 15:52 ` Borislav Petkov
2024-05-09 20:03 ` Borislav Petkov
2024-05-09 21:21 ` Dan Williams [this message]
2024-05-09 21:51 ` Borislav Petkov
2024-05-09 22:59 ` Dan Williams
2024-05-10 9:25 ` Borislav Petkov
2024-05-10 17:13 ` Dan Williams
2024-05-11 10:17 ` Borislav Petkov
2024-05-17 11:15 ` Jonathan Cameron
2024-05-17 11:44 ` Jonathan Cameron
2024-05-21 8:06 ` Borislav Petkov
2024-05-22 9:40 ` Jonathan Cameron
2024-05-27 9:09 ` Borislav Petkov
2024-05-20 10:54 ` Shiju Jose
2024-05-20 11:58 ` Jonathan Cameron
2024-05-27 9:21 ` Borislav Petkov
2024-05-28 9:06 ` Jonathan Cameron
2024-06-06 16:05 ` Borislav Petkov
2024-05-10 13:31 ` Jonathan Cameron
2024-05-09 21:47 ` Dan Williams
2024-05-10 9:03 ` Jonathan Cameron
2024-04-19 16:47 ` [RFC PATCH v8 02/10] cxl/mbox: Add GET_SUPPORTED_FEATURES mailbox command shiju.jose
2024-04-19 16:47 ` [RFC PATCH v8 03/10] cxl/mbox: Add GET_FEATURE " shiju.jose
2024-04-24 23:19 ` fan
2024-04-25 10:38 ` Shiju Jose
2024-04-19 16:47 ` [RFC PATCH v8 04/10] cxl/mbox: Add SET_FEATURE " shiju.jose
2024-04-25 17:26 ` fan
2024-04-19 16:47 ` [RFC PATCH v8 05/10] cxl/memscrub: Add CXL device patrol scrub control feature shiju.jose
2024-04-26 23:56 ` fan
2024-04-29 11:20 ` Shiju Jose
2024-04-29 12:21 ` Jonathan Cameron
2024-05-10 0:26 ` Dan Williams
2024-05-10 11:23 ` Jonathan Cameron
2024-04-19 16:47 ` [RFC PATCH v8 06/10] ACPICA: Add __free() based cleanup function for acpi_put_table shiju.jose
2024-04-19 18:06 ` Jonathan Cameron
2024-04-19 16:47 ` [RFC PATCH v8 07/10] platform: Add __free() based cleanup function for platform_device_put shiju.jose
2024-04-19 16:47 ` [RFC PATCH v8 08/10] ACPI:RAS2: Add ACPI RAS2 driver shiju.jose
2024-06-05 21:32 ` Daniel Ferguson
2024-04-19 16:47 ` [RFC PATCH v8 09/10] ras: scrub: Add scrub control attributes for ACPI RAS2 shiju.jose
2024-04-19 16:47 ` [RFC PATCH v8 10/10] ras: scrub: ACPI RAS2: Add memory ACPI RAS2 driver shiju.jose
2024-06-05 21:33 ` Daniel Ferguson
2024-06-07 15:46 ` Shiju Jose
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