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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>
62 lines
1.5 KiB
C
62 lines
1.5 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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* On sparc, thread_info data is static and TI_XXX offsets are computed by hand.
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*/
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#define COMPILE_OFFSETS
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#include <linux/sched.h>
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#include <linux/mm_types.h>
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// #include <linux/mm.h>
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#include <linux/kbuild.h>
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#include <asm/hibernate.h>
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#ifdef CONFIG_SPARC32
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static int __used sparc32_foo(void)
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{
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DEFINE(AOFF_thread_fork_kpsr,
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offsetof(struct thread_struct, fork_kpsr));
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return 0;
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}
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#else
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static int __used sparc64_foo(void)
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{
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#ifdef CONFIG_HIBERNATION
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BLANK();
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OFFSET(SC_REG_FP, saved_context, fp);
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OFFSET(SC_REG_CWP, saved_context, cwp);
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OFFSET(SC_REG_WSTATE, saved_context, wstate);
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OFFSET(SC_REG_TICK, saved_context, tick);
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OFFSET(SC_REG_PSTATE, saved_context, pstate);
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OFFSET(SC_REG_G4, saved_context, g4);
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OFFSET(SC_REG_G5, saved_context, g5);
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OFFSET(SC_REG_G6, saved_context, g6);
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#endif
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return 0;
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}
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#endif
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static int __used foo(void)
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{
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BLANK();
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DEFINE(AOFF_task_thread, offsetof(struct task_struct, thread));
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BLANK();
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DEFINE(AOFF_mm_context, offsetof(struct mm_struct, context));
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BLANK();
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DEFINE(VMA_VM_MM, offsetof(struct vm_area_struct, vm_mm));
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/* DEFINE(NUM_USER_SEGMENTS, TASK_SIZE>>28); */
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return 0;
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}
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