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https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
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Menglong DongandGreg Kroah-Hartman
4784326cb2
[ Upstream commit 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>
Signed-off-by: Sasha Levin <sashal@kernel.org>
50 lines
1.7 KiB
C
50 lines
1.7 KiB
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/io.h>
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void foo(void)
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{
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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_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(TASK_BLOCKED, offsetof(struct task_struct, blocked));
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DEFINE(TASK_CRED, offsetof(struct task_struct, cred));
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DEFINE(TASK_REAL_PARENT, offsetof(struct task_struct, real_parent));
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DEFINE(TASK_GROUP_LEADER, offsetof(struct task_struct, group_leader));
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DEFINE(TASK_TGID, offsetof(struct task_struct, tgid));
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BLANK();
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DEFINE(CRED_UID, offsetof(struct cred, uid));
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DEFINE(CRED_EUID, offsetof(struct cred, euid));
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DEFINE(CRED_GID, offsetof(struct cred, gid));
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DEFINE(CRED_EGID, offsetof(struct cred, egid));
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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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DEFINE(SWITCH_STACK_SIZE, sizeof(struct switch_stack));
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DEFINE(PT_PTRACED, PT_PTRACED);
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DEFINE(CLONE_VM, CLONE_VM);
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DEFINE(CLONE_UNTRACED, CLONE_UNTRACED);
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DEFINE(SIGCHLD, SIGCHLD);
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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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