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35561bab76
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>
33 lines
913 B
C
33 lines
913 B
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* Generate definitions needed by assembly language modules.
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* This code generates raw asm output which is post-processed to extract
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* and format the required data.
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*/
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#define COMPILE_OFFSETS
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#include <linux/types.h>
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#include <linux/stddef.h>
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#include <linux/sched.h>
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#include <linux/ptrace.h>
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#include <linux/kbuild.h>
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#include <asm/machvec.h>
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static void __used foo(void)
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{
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DEFINE(TI_FLAGS, offsetof(struct thread_info, flags));
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DEFINE(TI_FP, offsetof(struct thread_info, fp));
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DEFINE(TI_STATUS, offsetof(struct thread_info, status));
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BLANK();
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DEFINE(SP_OFF, offsetof(struct pt_regs, ps));
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DEFINE(SIZEOF_PT_REGS, sizeof(struct pt_regs));
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BLANK();
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DEFINE(SWITCH_STACK_SIZE, sizeof(struct switch_stack));
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BLANK();
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DEFINE(HAE_CACHE, offsetof(struct alpha_machine_vector, hae_cache));
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DEFINE(HAE_REG, offsetof(struct alpha_machine_vector, hae_register));
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}
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