add at24 driver

hc

2023-11-06 15ade055295d13f95d49e3d99b09f3bbfb4a43e7

 kernel/arch/arm/kernel/entry-armv.S
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@@ -209,11 +209,18 @@
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 #ifdef CONFIG_PREEMPT
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 	ldr	r8, [tsk, #TI_PREEMPT]		@ get preempt count
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-	ldr	r0, [tsk, #TI_FLAGS]		@ get flags
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 	teq	r8, #0				@ if preempt count != 0
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+	bne	1f				@ return from exeption
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+	ldr	r0, [tsk, #TI_FLAGS]		@ get flags
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+	tst	r0, #_TIF_NEED_RESCHED		@ if NEED_RESCHED is set
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+	blne	svc_preempt			@ preempt!
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+
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+	ldr	r8, [tsk, #TI_PREEMPT_LAZY]	@ get preempt lazy count
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+	teq	r8, #0				@ if preempt lazy count != 0
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 	movne	r0, #0				@ force flags to 0
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-	tst	r0, #_TIF_NEED_RESCHED
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+	tst	r0, #_TIF_NEED_RESCHED_LAZY
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 	blne	svc_preempt
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+1:
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 #endif
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 	svc_exit r5, irq = 1			@ return from exception
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@@ -228,8 +235,14 @@
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 1:	bl	preempt_schedule_irq		@ irq en/disable is done inside
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 	ldr	r0, [tsk, #TI_FLAGS]		@ get new tasks TI_FLAGS
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 	tst	r0, #_TIF_NEED_RESCHED
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+	bne	1b
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+	tst	r0, #_TIF_NEED_RESCHED_LAZY
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 	reteq	r8				@ go again
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-	b	1b
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+	ldr	r0, [tsk, #TI_PREEMPT_LAZY]	@ get preempt lazy count
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+	teq	r0, #0				@ if preempt lazy count != 0
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+	beq	1b
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+	ret	r8				@ go again
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+
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 #endif
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 __und_fault: