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From: "Shevchenko, Andriy" <andriy.shevchenko@intel.com>
To: "Schmauss, Erik" <erik.schmauss@intel.com>
Cc: "Moore, Robert" <robert.moore@intel.com>,
	Nikolaus Voss <nikolaus.voss@loewensteinmedical.de>,
	"Rafael J. Wysocki" <rjw@rjwysocki.net>,
	Ferry Toth <fntoth@gmail.com>, Len Brown <lenb@kernel.org>,
	Jacek Anaszewski <jacek.anaszewski@gmail.com>,
	Pavel Machek <pavel@ucw.cz>, Dan Murphy <dmurphy@ti.com>,
	"linux-acpi@vger.kernel.org" <linux-acpi@vger.kernel.org>,
	"devel@acpica.org" <devel@acpica.org>,
	"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
	"nv@vosn.de" <nv@vosn.de>
Subject: Re: [PATCH] ACPICA: make acpi_load_table() return table index
Date: Thu, 26 Sep 2019 11:09:36 +0300
Message-ID: <20190926080936.GB32742@smile.fi.intel.com> (raw)
In-Reply-To: <CF6A88132359CE47947DB4C6E1709ED53C646E97@ORSMSX122.amr.corp.intel.com>

On Wed, Sep 25, 2019 at 09:13:34PM +0300, Schmauss, Erik wrote:
> > -----Original Message-----
> > From: Ferry Toth <ftoth@telfort.nl>
> > Sent: Thursday, September 12, 2019 12:37 PM
> > To: Moore, Robert <robert.moore@intel.com>; Nikolaus Voss
> > <nikolaus.voss@loewensteinmedical.de>; Shevchenko, Andriy
> > <andriy.shevchenko@intel.com>; Schmauss, Erik <erik.schmauss@intel.com>;
> > Rafael J. Wysocki <rjw@rjwysocki.net>
> > Cc: Len Brown <lenb@kernel.org>; Jacek Anaszewski
> > <jacek.anaszewski@gmail.com>; Pavel Machek <pavel@ucw.cz>; Dan Murphy
> > <dmurphy@ti.com>; linux-acpi@vger.kernel.org; devel@acpica.org; linux-
> > kernel@vger.kernel.org; nv@vosn.de
> > Subject: Re: [PATCH] ACPICA: make acpi_load_table() return table index
> > 
> > Op 12-09-19 om 16:19 schreef Moore, Robert:
> > > Nikolaus,
> > > 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.
> > 
> > I really hope this is not the case. On x86 loading/unloading SSDTs has proven to
> > be a powerful way to handle reconfigurable hardware without rebooting and
> > without requiring dedicated platform drivers. Same for user plugable hardware
> > on i2c/spi busses.
> > 
> > This has worked before and will violate the "don't break user space" rule.
> 
> If the table index wasn't being used, how did this work before?
> Which commit broke this?
> 
> Bob and I are trying to understand if this is a regression or a new feature request...

It is a regression as I explained in my bisecting message.

Before it uses acpi_tb_* API directly.
I thought Bob already got the idea.

-- 
With Best Regards,
Andy Shevchenko



  reply index

Thread overview: 57+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-05-29 12:18 [PATCH 0/3] PWM framework: add support referencing PWMs from ACPI Nikolaus Voss
2019-05-29 12:18 ` [PATCH 1/3] ACPI: Resolve objects on host-directed table loads Nikolaus Voss
2019-05-30 14:42   ` Dan Murphy
2019-05-31 12:23     ` Pavel Machek
2019-05-31 12:45       ` Dan Murphy
2019-05-31 12:46     ` Dan Murphy
2019-06-03  9:12       ` Nikolaus Voss
2019-08-14 18:50   ` Andy Shevchenko
2019-08-14 20:27     ` Schmauss, Erik
2019-08-16 11:57       ` Nikolaus Voss
2019-08-30 14:53         ` Shevchenko, Andriy
2019-09-04  7:20           ` Nikolaus Voss
2019-09-06 17:46             ` Shevchenko, Andriy
2019-09-12  8:05               ` Nikolaus Voss
2019-09-12  8:07               ` [PATCH] ACPICA: make acpi_load_table() return table index Nikolaus Voss
2019-09-12 14:19                 ` Moore, Robert
2019-09-12 19:36                   ` Ferry Toth
2019-09-25 18:13                     ` Schmauss, Erik
2019-09-26  8:09                       ` Shevchenko, Andriy [this message]
2019-09-13  7:44                   ` Nikolaus Voss
2019-09-13 14:20                     ` Moore, Robert
2019-09-13 15:12                       ` Shevchenko, Andriy
2019-09-13 16:48                         ` Ferry Toth
2019-09-13 16:48                           ` Ferry Toth
2019-09-13 17:40                           ` Moore, Robert
2019-09-13 19:56                             ` Rafael J. Wysocki
2019-09-16  9:46                             ` Nikolaus Voss
2019-09-18 14:13                               ` Moore, Robert
2019-09-18 14:31                                 ` Nikolaus Voss
2019-09-19 17:05                                   ` Moore, Robert
2019-09-23  9:05                                     ` Nikolaus Voss
2019-09-24 19:41                                       ` Moore, Robert
2019-09-25 10:18                                         ` Nikolaus Voss
2019-09-25 10:53                                           ` Shevchenko, Andriy
2019-09-19  8:13                 ` Rafael J. Wysocki
2019-09-23  9:08                   ` Nikolaus Voss
2019-09-23  9:47                   ` [PATCH] ACPICA: Introduce acpi_load_table_with_index() Nikolaus Voss
2019-09-24 12:07                     ` Shevchenko, Andriy
2019-09-24 12:08                       ` Shevchenko, Andriy
2019-09-25 10:20                         ` Nikolaus Voss
2019-09-24 15:11                     ` Andy Shevchenko
2019-09-25 10:22                       ` Nikolaus Voss
2019-09-26 16:09                 ` [PATCH] ACPICA: make acpi_load_table() return table index Schmauss, Erik
2019-09-26 16:35                   ` Shevchenko, Andriy
2019-09-26 16:51                     ` Schmauss, Erik
2019-09-26 17:47                       ` Shevchenko, Andriy
2019-09-26 18:44                       ` Nikolaus Voss
2019-09-26 19:26                         ` Rafael J. Wysocki
2019-09-26 19:41                           ` Schmauss, Erik
2019-09-26 18:43                   ` Nikolaus Voss
2019-05-29 12:18 ` [PATCH 2/3] PWM framework: add support referencing PWMs from ACPI Nikolaus Voss
2019-05-30 14:54   ` Dan Murphy
2019-05-31 12:24     ` Pavel Machek
2019-06-03  9:27     ` Nikolaus Voss
2019-05-29 12:18 ` [PATCH 3/3] leds-pwm.c: support ACPI via firmware-node framework Nikolaus Voss
2019-05-30 15:14   ` Dan Murphy
2019-06-03  9:44     ` Nikolaus Voss

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