change otg to host mode

hc

2024-05-11 04dd17822334871b23ea2862f7798fb0e0007777

 kernel/arch/x86/lib/memmove_64.S
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@@ -8,7 +8,7 @@
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  */
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 #include <linux/linkage.h>
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 #include <asm/cpufeatures.h>
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-#include <asm/alternative-asm.h>
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+#include <asm/alternative.h>
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 #include <asm/export.h>
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 #undef memmove
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@@ -24,15 +24,10 @@
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  * Output:
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  * rax: dest
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  */
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-.weak memmove
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-.p2align 4, 0x90
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-memmove:
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-ENTRY(__memmove)
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+SYM_FUNC_START_WEAK(memmove)
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+SYM_FUNC_START(__memmove)
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-	/* Handle more 32 bytes in loop */
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 	mov %rdi, %rax
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-	cmp $0x20, %rdx
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-	jb	1f
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 	/* Decide forward/backward copy mode */
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 	cmp %rdi, %rsi
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@@ -42,8 +37,10 @@
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 	cmp %rdi, %r8
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 	jg 2f
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+	/* FSRM implies ERMS => no length checks, do the copy directly */
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 .Lmemmove_begin_forward:
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-	ALTERNATIVE "", "movq %rdx, %rcx; rep movsb; retq", X86_FEATURE_ERMS
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+	ALTERNATIVE "cmp $0x20, %rdx; jb 1f", "", X86_FEATURE_FSRM
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+	ALTERNATIVE "", "jmp .Lmemmove_erms", X86_FEATURE_ERMS
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 	/*
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 	 * movsq instruction have many startup latency
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@@ -114,6 +111,8 @@
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 	 */
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 	.p2align 4
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 2:
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+	cmp $0x20, %rdx
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+	jb 1f
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 	cmp $680, %rdx
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 	jb 6f
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 	cmp %dil, %sil
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@@ -206,8 +205,13 @@
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 	movb (%rsi), %r11b
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 	movb %r11b, (%rdi)
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 13:
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-	retq
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-ENDPROC(__memmove)
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-ENDPROC(memmove)
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+	RET
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+
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+.Lmemmove_erms:
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+	movq %rdx, %rcx
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+	rep movsb
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+	RET
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+SYM_FUNC_END(__memmove)
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+SYM_FUNC_END_ALIAS(memmove)
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 EXPORT_SYMBOL(__memmove)
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 EXPORT_SYMBOL(memmove)