On Fri, Sep 13, 2019 at 05:20:21PM +0300, Moore, Robert wrote: > -----Original Message----- > From: Nikolaus Voss [mailto:nv@xxxxxxx] > Sent: Friday, September 13, 2019 12:44 AM > To: Moore, Robert <robert.moore@xxxxxxxxx> > Cc: Shevchenko, Andriy <andriy.shevchenko@xxxxxxxxx>; Schmauss, Erik <erik.schmauss@xxxxxxxxx>; Rafael J. Wysocki <rjw@xxxxxxxxxxxxx>; Len Brown <lenb@xxxxxxxxxx>; Jacek Anaszewski <jacek.anaszewski@xxxxxxxxx>; Pavel Machek <pavel@xxxxxx>; Dan Murphy <dmurphy@xxxxxx>; linux-acpi@xxxxxxxxxxxxxxx; devel@xxxxxxxxxx; linux-kernel@xxxxxxxxxxxxxxx; Ferry Toth <ftoth@xxxxxxxxxx>; nikolaus.voss@xxxxxxxxxxxxxxxxxxxxx > Subject: RE: [PATCH] ACPICA: make acpi_load_table() return table index > > Bob, > > On Thu, 12 Sep 2019, Moore, Robert wrote: > > The ability to unload an ACPI table (especially AML tables such as > > SSDTs) is in the process of being deprecated in ACPICA -- since it is > > also deprecated in the current ACPI specification. This is being done > > because of the difficulty of deleting the namespace entries for the > > table. FYI, Windows does not properly support this function either. > > ok, I see it can be a problem to unload an AML table with all it's consequences e.g. with respect to driver unregistering in setups with complex dependencies. It will only work properly under certain conditions > - nevertheless acpi_tb_unload_table() is still exported in ACPICA and we should get this working as it worked before. > > AcpiTbUnloadTable is not exported, it is an internal interface only -- as > recognized by the "AcpiTb". In Linux it became a part of ABI when the commit 772bf1e2878ecfca0d1f332071c83e021dd9cf01 Author: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> Date: Fri Jun 9 20:36:31 2017 +0200 ACPI: configfs: Unload SSDT on configfs entry removal appeared in the kernel. > I'm not sure that I want to change the interface > to AcpiLoadTable just for something that is being deprecated. Already, we > throw an ACPI_EXCEPTION if the Unload operator is encountered in the AML byte > stream. The same thing with AcpiUnloadParentTable - it is being deprecated. > > ACPI_EXCEPTION ((AE_INFO, AE_NOT_IMPLEMENTED, > "AML Unload operator is not supported")); -- With Best Regards, Andy Shevchenko
