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The include/generated/asm-offsets.h is generated in Kbuild during compiling from arch/SRCARCH/kernel/asm-offsets.c. When we want to generate another similar offset header file, circular dependency can happen. For example, we want to generate a offset file include/generated/test.h, which is included in include/sched/sched.h. If we generate asm-offsets.h first, it will fail, as include/sched/sched.h is included in asm-offsets.c and include/generated/test.h doesn't exist; If we generate test.h first, it can't success neither, as include/generated/asm-offsets.h is included by it. In x86_64, the macro COMPILE_OFFSETS is used to avoid such circular dependency. We can generate asm-offsets.h first, and if the COMPILE_OFFSETS is defined, we don't include the "generated/test.h". And we define the macro COMPILE_OFFSETS for all the asm-offsets.c for this purpose. Signed-off-by: Menglong Dong <dongml2@chinatelecom.cn> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
62 lines
2.5 KiB
C
62 lines
2.5 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* This program is used to generate definitions needed by
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* assembly language modules.
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*
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* We use the technique used in the OSF Mach kernel code:
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* generate asm statements containing #defines,
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* compile this file to assembler, and then extract the
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* #defines from the assembly-language output.
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*/
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#define COMPILE_OFFSETS
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#include <linux/stddef.h>
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#include <linux/types.h>
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#include <linux/mm.h>
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#include <linux/kbuild.h>
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#include <linux/suspend.h>
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#include <asm/thread_info.h>
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#include <asm/suspend.h>
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int main(void)
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{
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/* offsets into the thread_info struct */
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DEFINE(TI_TASK, offsetof(struct thread_info, task));
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DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
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DEFINE(TI_CPU, offsetof(struct thread_info, cpu));
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DEFINE(TI_PRE_COUNT, offsetof(struct thread_info, preempt_count));
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DEFINE(TI_SIZE, sizeof(struct thread_info));
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#ifdef CONFIG_HIBERNATION
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DEFINE(PBE_ADDRESS, offsetof(struct pbe, address));
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DEFINE(PBE_ORIG_ADDRESS, offsetof(struct pbe, orig_address));
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DEFINE(PBE_NEXT, offsetof(struct pbe, next));
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DEFINE(SWSUSP_ARCH_REGS_SIZE, sizeof(struct swsusp_arch_regs));
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#endif
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DEFINE(SH_SLEEP_MODE, offsetof(struct sh_sleep_data, mode));
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DEFINE(SH_SLEEP_SF_PRE, offsetof(struct sh_sleep_data, sf_pre));
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DEFINE(SH_SLEEP_SF_POST, offsetof(struct sh_sleep_data, sf_post));
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DEFINE(SH_SLEEP_RESUME, offsetof(struct sh_sleep_data, resume));
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DEFINE(SH_SLEEP_VBR, offsetof(struct sh_sleep_data, vbr));
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DEFINE(SH_SLEEP_SPC, offsetof(struct sh_sleep_data, spc));
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DEFINE(SH_SLEEP_SR, offsetof(struct sh_sleep_data, sr));
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DEFINE(SH_SLEEP_SP, offsetof(struct sh_sleep_data, sp));
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DEFINE(SH_SLEEP_BASE_ADDR, offsetof(struct sh_sleep_data, addr));
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DEFINE(SH_SLEEP_BASE_DATA, offsetof(struct sh_sleep_data, data));
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DEFINE(SH_SLEEP_REG_STBCR, offsetof(struct sh_sleep_regs, stbcr));
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DEFINE(SH_SLEEP_REG_BAR, offsetof(struct sh_sleep_regs, bar));
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DEFINE(SH_SLEEP_REG_PTEH, offsetof(struct sh_sleep_regs, pteh));
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DEFINE(SH_SLEEP_REG_PTEL, offsetof(struct sh_sleep_regs, ptel));
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DEFINE(SH_SLEEP_REG_TTB, offsetof(struct sh_sleep_regs, ttb));
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DEFINE(SH_SLEEP_REG_TEA, offsetof(struct sh_sleep_regs, tea));
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DEFINE(SH_SLEEP_REG_MMUCR, offsetof(struct sh_sleep_regs, mmucr));
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DEFINE(SH_SLEEP_REG_PTEA, offsetof(struct sh_sleep_regs, ptea));
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DEFINE(SH_SLEEP_REG_PASCR, offsetof(struct sh_sleep_regs, pascr));
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DEFINE(SH_SLEEP_REG_IRMCR, offsetof(struct sh_sleep_regs, irmcr));
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DEFINE(SH_SLEEP_REG_CCR, offsetof(struct sh_sleep_regs, ccr));
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DEFINE(SH_SLEEP_REG_RAMCR, offsetof(struct sh_sleep_regs, ramcr));
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return 0;
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}
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