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>
38 lines
1.1 KiB
C
38 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_DEVICE_ID_TB_H
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#define LINUX_DEVICE_ID_TB_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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#define TBSVC_MATCH_PROTOCOL_KEY 0x0001
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#define TBSVC_MATCH_PROTOCOL_ID 0x0002
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#define TBSVC_MATCH_PROTOCOL_VERSION 0x0004
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#define TBSVC_MATCH_PROTOCOL_REVISION 0x0008
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/**
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* struct tb_service_id - Thunderbolt service identifiers
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* @match_flags: Flags used to match the structure
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* @protocol_key: Protocol key the service supports
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* @protocol_id: Protocol id the service supports
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* @protocol_version: Version of the protocol
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* @protocol_revision: Revision of the protocol software
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* @driver_data: Driver specific data
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*
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* Thunderbolt XDomain services are exposed as devices where each device
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* carries the protocol information the service supports. Thunderbolt
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* XDomain service drivers match against that information.
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*/
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struct tb_service_id {
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__u32 match_flags;
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char protocol_key[8 + 1];
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__u32 protocol_id;
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__u32 protocol_version;
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__u32 protocol_revision;
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kernel_ulong_t driver_data;
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};
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#endif /* ifndef LINUX_DEVICE_ID_TB_H */
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