mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2026-08-09 06:14:34 +02:00
Uwe Kleine-König (The Capable Hub)
ad428f5811
<linux/mod_devicetable.h> is included transitively in nearly every driver in an x86_64 allmodconfig build of v7.1: $ find drivers -name \*.o -not -name \*.mod.o | wc -l 21330 $ find drivers -name \*.o.cmd -not -name \*.mod.o.cmd | xargs grep -l mod_devicetable.h | wc -l 17038 The result is that even when touching an obscure device id struct most of the kernel needs to be recompiled. Given that each driver typically only needs one or two of these structures, splitting into per subsystem headers and only including what is really needed reduces the amount of needed recompilation. Implement the first step and define each device id struct in a separate header (together with its associated #defines). <linux/mod_devicetable.h> is modified to include all the new headers to continue to provide the same symbols. Several headers currently include <linux/mod_devicetable.h>, those that are most lukrative to include only their subsystem headers only are: $ git -C source grep -l mod_devicetable.h include/linux | while read h; do echo -n "$h:"; find drivers -name \*.o.cmd -not -name \*.mod.o.cmd | xargs grep -l $h | wc -l; done | sort -t: -k2 -n -r | head include/linux/of.h:10897 include/linux/pci.h:7920 include/linux/acpi.h:7097 include/linux/i2c.h:5402 include/linux/spi/spi.h:1897 include/linux/dmi.h:1643 include/linux/usb.h:1222 include/linux/input.h:1205 include/linux/mdio.h:835 include/linux/phy.h:733 struct cpu_feature isn't really a device_id struct. That is kept in <linux/mod_devicetable.h> for now. Acked-by: Danilo Krummrich <dakr@kernel.org> Acked-by: Takashi Sakamoto <o-takashi@sakamocchi.jp> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> # zorro Link: https://patch.msgid.link/41400e323be8640702b906d04327e833c5bdaf4a.1782808461.git.u.kleine-koenig@baylibre.com [Drop "MOD" from the header guards] Signed-off-by: Uwe Kleine-König (The Capable Hub) <u.kleine-koenig@baylibre.com>
41 lines
1003 B
C
41 lines
1003 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_DEVICE_ID_CDX_H
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#define LINUX_DEVICE_ID_CDX_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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#endif
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#define CDX_ANY_ID (0xFFFF)
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enum {
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CDX_ID_F_VFIO_DRIVER_OVERRIDE = 1,
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};
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/**
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* struct cdx_device_id - CDX device identifier
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* @vendor: Vendor ID
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* @device: Device ID
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* @subvendor: Subsystem vendor ID (or CDX_ANY_ID)
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* @subdevice: Subsystem device ID (or CDX_ANY_ID)
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* @class: Device class
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* Most drivers do not need to specify class/class_mask
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* as vendor/device is normally sufficient.
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* @class_mask: Limit which sub-fields of the class field are compared.
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* @override_only: Match only when dev->driver_override is this driver.
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*
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* Type of entries in the "device Id" table for CDX devices supported by
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* a CDX device driver.
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*/
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struct cdx_device_id {
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__u16 vendor;
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__u16 device;
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__u16 subvendor;
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__u16 subdevice;
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__u32 class;
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__u32 class_mask;
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__u32 override_only;
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};
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#endif /* ifndef LINUX_DEVICE_ID_CDX_H */
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