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![Tejun Heo](/assets/img/avatar_default.png)
percpu.h is included by sched.h and module.h and thus ends up being included when building most .c files. percpu.h includes slab.h which in turn includes gfp.h making everything defined by the two files universally available and complicating inclusion dependencies. percpu.h -> slab.h dependency is about to be removed. Prepare for this change by updating users of gfp and slab facilities include those headers directly instead of assuming availability. As this conversion needs to touch large number of source files, the following script is used as the basis of conversion. http://userweb.kernel.org/~tj/misc/slabh-sweep.py The script does the followings. * Scan files for gfp and slab usages and update includes such that only the necessary includes are there. ie. if only gfp is used, gfp.h, if slab is used, slab.h. * When the script inserts a new include, it looks at the include blocks and try to put the new include such that its order conforms to its surrounding. It's put in the include block which contains core kernel includes, in the same order that the rest are ordered - alphabetical, Christmas tree, rev-Xmas-tree or at the end if there doesn't seem to be any matching order. * If the script can't find a place to put a new include (mostly because the file doesn't have fitting include block), it prints out an error message indicating which .h file needs to be added to the file. The conversion was done in the following steps. 1. The initial automatic conversion of all .c files updated slightly over 4000 files, deleting around 700 includes and adding ~480 gfp.h and ~3000 slab.h inclusions. The script emitted errors for ~400 files. 2. Each error was manually checked. Some didn't need the inclusion, some needed manual addition while adding it to implementation .h or embedding .c file was more appropriate for others. This step added inclusions to around 150 files. 3. The script was run again and the output was compared to the edits from #2 to make sure no file was left behind. 4. Several build tests were done and a couple of problems were fixed. e.g. lib/decompress_*.c used malloc/free() wrappers around slab APIs requiring slab.h to be added manually. 5. The script was run on all .h files but without automatically editing them as sprinkling gfp.h and slab.h inclusions around .h files could easily lead to inclusion dependency hell. Most gfp.h inclusion directives were ignored as stuff from gfp.h was usually wildly available and often used in preprocessor macros. Each slab.h inclusion directive was examined and added manually as necessary. 6. percpu.h was updated not to include slab.h. 7. Build test were done on the following configurations and failures were fixed. CONFIG_GCOV_KERNEL was turned off for all tests (as my distributed build env didn't work with gcov compiles) and a few more options had to be turned off depending on archs to make things build (like ipr on powerpc/64 which failed due to missing writeq). * x86 and x86_64 UP and SMP allmodconfig and a custom test config. * powerpc and powerpc64 SMP allmodconfig * sparc and sparc64 SMP allmodconfig * ia64 SMP allmodconfig * s390 SMP allmodconfig * alpha SMP allmodconfig * um on x86_64 SMP allmodconfig 8. percpu.h modifications were reverted so that it could be applied as a separate patch and serve as bisection point. Given the fact that I had only a couple of failures from tests on step 6, I'm fairly confident about the coverage of this conversion patch. If there is a breakage, it's likely to be something in one of the arch headers which should be easily discoverable easily on most builds of the specific arch. Signed-off-by: Tejun Heo <tj@kernel.org> Guess-its-ok-by: Christoph Lameter <cl@linux-foundation.org> Cc: Ingo Molnar <mingo@redhat.com> Cc: Lee Schermerhorn <Lee.Schermerhorn@hp.com>
283 lines
6.9 KiB
C
283 lines
6.9 KiB
C
/*
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* acpi_container.c - ACPI Generic Container Driver
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* ($Revision: )
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*
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* Copyright (C) 2004 Anil S Keshavamurthy (anil.s.keshavamurthy@intel.com)
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* Copyright (C) 2004 Keiichiro Tokunaga (tokunaga.keiich@jp.fujitsu.com)
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* Copyright (C) 2004 Motoyuki Ito (motoyuki@soft.fujitsu.com)
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* Copyright (C) 2004 Intel Corp.
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* Copyright (C) 2004 FUJITSU LIMITED
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or (at
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* your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA.
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*
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* ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
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*/
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#include <linux/kernel.h>
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#include <linux/module.h>
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#include <linux/init.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/acpi.h>
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#include <acpi/acpi_bus.h>
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#include <acpi/acpi_drivers.h>
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#include <acpi/container.h>
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#define PREFIX "ACPI: "
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#define ACPI_CONTAINER_DEVICE_NAME "ACPI container device"
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#define ACPI_CONTAINER_CLASS "container"
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#define INSTALL_NOTIFY_HANDLER 1
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#define UNINSTALL_NOTIFY_HANDLER 2
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#define _COMPONENT ACPI_CONTAINER_COMPONENT
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ACPI_MODULE_NAME("container");
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MODULE_AUTHOR("Anil S Keshavamurthy");
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MODULE_DESCRIPTION("ACPI container driver");
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MODULE_LICENSE("GPL");
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static int acpi_container_add(struct acpi_device *device);
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static int acpi_container_remove(struct acpi_device *device, int type);
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static const struct acpi_device_id container_device_ids[] = {
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{"ACPI0004", 0},
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{"PNP0A05", 0},
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{"PNP0A06", 0},
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{"", 0},
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};
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MODULE_DEVICE_TABLE(acpi, container_device_ids);
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static struct acpi_driver acpi_container_driver = {
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.name = "container",
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.class = ACPI_CONTAINER_CLASS,
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.ids = container_device_ids,
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.ops = {
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.add = acpi_container_add,
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.remove = acpi_container_remove,
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},
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};
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/*******************************************************************/
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static int is_device_present(acpi_handle handle)
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{
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acpi_handle temp;
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acpi_status status;
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unsigned long long sta;
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status = acpi_get_handle(handle, "_STA", &temp);
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if (ACPI_FAILURE(status))
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return 1; /* _STA not found, assume device present */
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status = acpi_evaluate_integer(handle, "_STA", NULL, &sta);
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if (ACPI_FAILURE(status))
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return 0; /* Firmware error */
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return ((sta & ACPI_STA_DEVICE_PRESENT) == ACPI_STA_DEVICE_PRESENT);
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}
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/*******************************************************************/
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static int acpi_container_add(struct acpi_device *device)
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{
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struct acpi_container *container;
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if (!device) {
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printk(KERN_ERR PREFIX "device is NULL\n");
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return -EINVAL;
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}
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container = kzalloc(sizeof(struct acpi_container), GFP_KERNEL);
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if (!container)
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return -ENOMEM;
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container->handle = device->handle;
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strcpy(acpi_device_name(device), ACPI_CONTAINER_DEVICE_NAME);
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strcpy(acpi_device_class(device), ACPI_CONTAINER_CLASS);
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device->driver_data = container;
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ACPI_DEBUG_PRINT((ACPI_DB_INFO, "Device <%s> bid <%s>\n",
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acpi_device_name(device), acpi_device_bid(device)));
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return 0;
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}
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static int acpi_container_remove(struct acpi_device *device, int type)
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{
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acpi_status status = AE_OK;
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struct acpi_container *pc = NULL;
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pc = acpi_driver_data(device);
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kfree(pc);
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return status;
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}
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static int container_device_add(struct acpi_device **device, acpi_handle handle)
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{
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acpi_handle phandle;
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struct acpi_device *pdev;
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int result;
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if (acpi_get_parent(handle, &phandle)) {
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return -ENODEV;
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}
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if (acpi_bus_get_device(phandle, &pdev)) {
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return -ENODEV;
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}
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if (acpi_bus_add(device, pdev, handle, ACPI_BUS_TYPE_DEVICE)) {
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return -ENODEV;
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}
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result = acpi_bus_start(*device);
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return result;
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}
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static void container_notify_cb(acpi_handle handle, u32 type, void *context)
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{
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struct acpi_device *device = NULL;
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int result;
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int present;
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acpi_status status;
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present = is_device_present(handle);
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switch (type) {
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case ACPI_NOTIFY_BUS_CHECK:
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/* Fall through */
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case ACPI_NOTIFY_DEVICE_CHECK:
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printk(KERN_WARNING "Container driver received %s event\n",
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(type == ACPI_NOTIFY_BUS_CHECK) ?
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"ACPI_NOTIFY_BUS_CHECK" : "ACPI_NOTIFY_DEVICE_CHECK");
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status = acpi_bus_get_device(handle, &device);
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if (present) {
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if (ACPI_FAILURE(status) || !device) {
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result = container_device_add(&device, handle);
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if (!result)
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kobject_uevent(&device->dev.kobj,
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KOBJ_ONLINE);
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else
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printk(KERN_WARNING
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"Failed to add container\n");
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}
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} else {
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if (ACPI_SUCCESS(status)) {
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/* device exist and this is a remove request */
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kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
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}
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}
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break;
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case ACPI_NOTIFY_EJECT_REQUEST:
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if (!acpi_bus_get_device(handle, &device) && device) {
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kobject_uevent(&device->dev.kobj, KOBJ_OFFLINE);
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}
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break;
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default:
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break;
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}
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return;
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}
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static acpi_status
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container_walk_namespace_cb(acpi_handle handle,
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u32 lvl, void *context, void **rv)
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{
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char *hid = NULL;
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struct acpi_device_info *info;
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acpi_status status;
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int *action = context;
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status = acpi_get_object_info(handle, &info);
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if (ACPI_FAILURE(status)) {
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return AE_OK;
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}
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if (info->valid & ACPI_VALID_HID)
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hid = info->hardware_id.string;
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if (hid == NULL) {
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goto end;
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}
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if (strcmp(hid, "ACPI0004") && strcmp(hid, "PNP0A05") &&
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strcmp(hid, "PNP0A06")) {
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goto end;
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}
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switch (*action) {
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case INSTALL_NOTIFY_HANDLER:
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acpi_install_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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container_notify_cb, NULL);
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break;
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case UNINSTALL_NOTIFY_HANDLER:
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acpi_remove_notify_handler(handle,
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ACPI_SYSTEM_NOTIFY,
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container_notify_cb);
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break;
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default:
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break;
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}
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end:
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kfree(info);
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return AE_OK;
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}
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static int __init acpi_container_init(void)
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{
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int result = 0;
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int action = INSTALL_NOTIFY_HANDLER;
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result = acpi_bus_register_driver(&acpi_container_driver);
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if (result < 0) {
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return (result);
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}
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/* register notify handler to every container device */
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acpi_walk_namespace(ACPI_TYPE_DEVICE,
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ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX,
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container_walk_namespace_cb, NULL, &action, NULL);
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return (0);
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}
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static void __exit acpi_container_exit(void)
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{
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int action = UNINSTALL_NOTIFY_HANDLER;
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acpi_walk_namespace(ACPI_TYPE_DEVICE,
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ACPI_ROOT_OBJECT,
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ACPI_UINT32_MAX,
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container_walk_namespace_cb, NULL, &action, NULL);
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acpi_bus_unregister_driver(&acpi_container_driver);
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return;
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}
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module_init(acpi_container_init);
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module_exit(acpi_container_exit);
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