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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>
201 lines
4.2 KiB
C
201 lines
4.2 KiB
C
/*
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* dell_led.c - Dell LED Driver
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*
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* Copyright (C) 2010 Dell Inc.
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* Louis Davis <louis_davis@dell.com>
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* Jim Dailey <jim_dailey@dell.com>
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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
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* published by the Free Software Foundation.
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*
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*/
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#include <linux/acpi.h>
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#include <linux/leds.h>
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#include <linux/slab.h>
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MODULE_AUTHOR("Louis Davis/Jim Dailey");
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MODULE_DESCRIPTION("Dell LED Control Driver");
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MODULE_LICENSE("GPL");
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#define DELL_LED_BIOS_GUID "F6E4FE6E-909D-47cb-8BAB-C9F6F2F8D396"
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MODULE_ALIAS("wmi:" DELL_LED_BIOS_GUID);
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/* Error Result Codes: */
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#define INVALID_DEVICE_ID 250
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#define INVALID_PARAMETER 251
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#define INVALID_BUFFER 252
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#define INTERFACE_ERROR 253
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#define UNSUPPORTED_COMMAND 254
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#define UNSPECIFIED_ERROR 255
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/* Device ID */
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#define DEVICE_ID_PANEL_BACK 1
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/* LED Commands */
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#define CMD_LED_ON 16
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#define CMD_LED_OFF 17
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#define CMD_LED_BLINK 18
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struct bios_args {
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unsigned char length;
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unsigned char result_code;
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unsigned char device_id;
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unsigned char command;
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unsigned char on_time;
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unsigned char off_time;
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};
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static int dell_led_perform_fn(u8 length,
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u8 result_code,
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u8 device_id,
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u8 command,
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u8 on_time,
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u8 off_time)
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{
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struct bios_args *bios_return;
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u8 return_code;
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union acpi_object *obj;
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struct acpi_buffer output = { ACPI_ALLOCATE_BUFFER, NULL };
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struct acpi_buffer input;
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acpi_status status;
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struct bios_args args;
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args.length = length;
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args.result_code = result_code;
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args.device_id = device_id;
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args.command = command;
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args.on_time = on_time;
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args.off_time = off_time;
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input.length = sizeof(struct bios_args);
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input.pointer = &args;
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status = wmi_evaluate_method(DELL_LED_BIOS_GUID,
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1,
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1,
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&input,
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&output);
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if (ACPI_FAILURE(status))
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return status;
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obj = output.pointer;
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if (!obj)
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return -EINVAL;
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else if (obj->type != ACPI_TYPE_BUFFER) {
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kfree(obj);
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return -EINVAL;
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}
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bios_return = ((struct bios_args *)obj->buffer.pointer);
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return_code = bios_return->result_code;
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kfree(obj);
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return return_code;
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}
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static int led_on(void)
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{
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return dell_led_perform_fn(3, /* Length of command */
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INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
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DEVICE_ID_PANEL_BACK, /* Device ID */
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CMD_LED_ON, /* Command */
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0, /* not used */
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0); /* not used */
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}
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static int led_off(void)
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{
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return dell_led_perform_fn(3, /* Length of command */
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INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
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DEVICE_ID_PANEL_BACK, /* Device ID */
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CMD_LED_OFF, /* Command */
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0, /* not used */
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0); /* not used */
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}
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static int led_blink(unsigned char on_eighths,
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unsigned char off_eighths)
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{
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return dell_led_perform_fn(5, /* Length of command */
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INTERFACE_ERROR, /* Init to INTERFACE_ERROR */
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DEVICE_ID_PANEL_BACK, /* Device ID */
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CMD_LED_BLINK, /* Command */
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on_eighths, /* blink on in eigths of a second */
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off_eighths); /* blink off in eights of a second */
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}
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static void dell_led_set(struct led_classdev *led_cdev,
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enum led_brightness value)
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{
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if (value == LED_OFF)
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led_off();
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else
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led_on();
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}
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static int dell_led_blink(struct led_classdev *led_cdev,
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unsigned long *delay_on,
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unsigned long *delay_off)
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{
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unsigned long on_eighths;
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unsigned long off_eighths;
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/* The Dell LED delay is based on 125ms intervals.
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Need to round up to next interval. */
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on_eighths = (*delay_on + 124) / 125;
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if (0 == on_eighths)
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on_eighths = 1;
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if (on_eighths > 255)
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on_eighths = 255;
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*delay_on = on_eighths * 125;
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off_eighths = (*delay_off + 124) / 125;
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if (0 == off_eighths)
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off_eighths = 1;
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if (off_eighths > 255)
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off_eighths = 255;
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*delay_off = off_eighths * 125;
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led_blink(on_eighths, off_eighths);
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return 0;
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}
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static struct led_classdev dell_led = {
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.name = "dell::lid",
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.brightness = LED_OFF,
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.max_brightness = 1,
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.brightness_set = dell_led_set,
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.blink_set = dell_led_blink,
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.flags = LED_CORE_SUSPENDRESUME,
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};
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static int __init dell_led_init(void)
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{
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int error = 0;
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if (!wmi_has_guid(DELL_LED_BIOS_GUID))
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return -ENODEV;
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error = led_off();
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if (error != 0)
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return -ENODEV;
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return led_classdev_register(NULL, &dell_led);
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}
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static void __exit dell_led_exit(void)
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{
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led_classdev_unregister(&dell_led);
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led_off();
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}
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module_init(dell_led_init);
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module_exit(dell_led_exit);
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