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>
45 lines
1.1 KiB
C
45 lines
1.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#ifndef LINUX_DEVICE_ID_X86_CPU_H
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#define LINUX_DEVICE_ID_X86_CPU_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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/* Wild cards for x86_cpu_id::vendor, family, model and feature */
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#define X86_VENDOR_ANY 0xffff
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#define X86_FAMILY_ANY 0
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#define X86_MODEL_ANY 0
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#define X86_STEPPING_ANY 0
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#define X86_STEP_MIN 0
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#define X86_STEP_MAX 0xf
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#define X86_PLATFORM_ANY 0x0
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#define X86_FEATURE_ANY 0 /* Same as FPU, you can't test for that */
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#define X86_CPU_TYPE_ANY 0
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/*
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* Match x86 CPUs for CPU specific drivers.
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* See documentation of "x86_match_cpu" for details.
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*/
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/*
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* MODULE_DEVICE_TABLE expects this struct to be called x86cpu_device_id.
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* Although gcc seems to ignore this error, clang fails without this define.
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*/
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#define x86cpu_device_id x86_cpu_id
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struct x86_cpu_id {
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__u16 vendor;
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__u16 family;
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__u16 model;
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__u16 steppings;
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__u16 feature; /* bit index */
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/* Solely for kernel-internal use: DO NOT EXPORT to userspace! */
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__u16 flags;
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__u8 platform_mask;
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__u8 type;
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kernel_ulong_t driver_data;
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};
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#endif /* ifndef LINUX_DEVICE_ID_X86_CPU_H */
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