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>
35 lines
995 B
C
35 lines
995 B
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_DEVICE_ID_DFL_H
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#define LINUX_DEVICE_ID_DFL_H
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#ifdef __KERNEL__
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#include <linux/types.h>
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typedef unsigned long kernel_ulong_t;
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#endif
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/*
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* DFL (Device Feature List)
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*
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* DFL defines a linked list of feature headers within the device MMIO space to
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* provide an extensible way of adding features. Software can walk through these
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* predefined data structures to enumerate features. It is now used in the FPGA.
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* See Documentation/fpga/dfl.rst for more information.
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*
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* The dfl bus type is introduced to match the individual feature devices (dfl
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* devices) for specific dfl drivers.
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*/
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/**
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* struct dfl_device_id - dfl device identifier
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* @type: DFL FIU type of the device. See enum dfl_id_type.
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* @feature_id: feature identifier local to its DFL FIU type.
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* @driver_data: driver specific data.
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*/
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struct dfl_device_id {
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__u16 type;
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__u16 feature_id;
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kernel_ulong_t driver_data;
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};
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#endif /* ifndef LINUX_DEVICE_ID_DFL_H */
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