add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/arch/x86/include/asm/thread_info.h
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@@ -56,16 +56,23 @@
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 struct thread_info {
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 	unsigned long		flags;		/* low level flags */
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 	u32			status;		/* thread synchronous flags */
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+	int			preempt_lazy_count;	/* 0 => lazy preemptable
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+							  <0 => BUG */
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 };
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 #define INIT_THREAD_INFO(tsk)			\
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 {						\
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 	.flags		= 0,			\
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+	.preempt_lazy_count = 0,		\
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 }
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 #else /* !__ASSEMBLY__ */
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 #include <asm/asm-offsets.h>
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+
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+#define GET_THREAD_INFO(reg) \
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+	_ASM_MOV PER_CPU_VAR(cpu_current_top_of_stack),reg ; \
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+	_ASM_SUB $(THREAD_SIZE),reg ;
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 #endif
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@@ -91,6 +98,7 @@
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 #define TIF_NOCPUID		15	/* CPUID is not accessible in userland */
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 #define TIF_NOTSC		16	/* TSC is not accessible in userland */
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 #define TIF_IA32		17	/* IA32 compatibility process */
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+#define TIF_NEED_RESCHED_LAZY	18	/* lazy rescheduling necessary */
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 #define TIF_NOHZ		19	/* in adaptive nohz mode */
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 #define TIF_MEMDIE		20	/* is terminating due to OOM killer */
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 #define TIF_POLLING_NRFLAG	21	/* idle is polling for TIF_NEED_RESCHED */
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@@ -120,6 +128,7 @@
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 #define _TIF_NOCPUID		(1 << TIF_NOCPUID)
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 #define _TIF_NOTSC		(1 << TIF_NOTSC)
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 #define _TIF_IA32		(1 << TIF_IA32)
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+#define _TIF_NEED_RESCHED_LAZY	(1 << TIF_NEED_RESCHED_LAZY)
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 #define _TIF_NOHZ		(1 << TIF_NOHZ)
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 #define _TIF_POLLING_NRFLAG	(1 << TIF_POLLING_NRFLAG)
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 #define _TIF_IO_BITMAP		(1 << TIF_IO_BITMAP)
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@@ -165,6 +174,8 @@
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 #define _TIF_WORK_CTXSW_PREV (_TIF_WORK_CTXSW|_TIF_USER_RETURN_NOTIFY)
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 #define _TIF_WORK_CTXSW_NEXT (_TIF_WORK_CTXSW)
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+#define _TIF_NEED_RESCHED_MASK	(_TIF_NEED_RESCHED | _TIF_NEED_RESCHED_LAZY)
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+
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 #define STACK_WARN		(THREAD_SIZE/8)
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 /*