add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/arch/arm/kernel/perf_callchain.c
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@@ -37,7 +37,7 @@
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 	struct frame_tail buftail;
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 	unsigned long err;
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-	if (!access_ok(VERIFY_READ, tail, sizeof(buftail)))
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+	if (!access_ok(tail, sizeof(buftail)))
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 		return NULL;
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 	pagefault_disable();
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@@ -62,9 +62,10 @@
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 void
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 perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
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 {
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+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
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 	struct frame_tail __user *tail;
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-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
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+	if (guest_cbs && guest_cbs->is_in_guest()) {
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 		/* We don't support guest os callchain now */
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 		return;
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 	}
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@@ -98,9 +99,10 @@
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 void
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 perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
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 {
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+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
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 	struct stackframe fr;
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-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
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+	if (guest_cbs && guest_cbs->is_in_guest()) {
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 		/* We don't support guest os callchain now */
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 		return;
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 	}
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@@ -111,18 +113,21 @@
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 unsigned long perf_instruction_pointer(struct pt_regs *regs)
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 {
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-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest())
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-		return perf_guest_cbs->get_guest_ip();
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+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
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+
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+	if (guest_cbs && guest_cbs->is_in_guest())
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+		return guest_cbs->get_guest_ip();
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 	return instruction_pointer(regs);
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 }
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 unsigned long perf_misc_flags(struct pt_regs *regs)
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 {
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+	struct perf_guest_info_callbacks *guest_cbs = perf_get_guest_cbs();
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 	int misc = 0;
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-	if (perf_guest_cbs && perf_guest_cbs->is_in_guest()) {
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-		if (perf_guest_cbs->is_user_mode())
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+	if (guest_cbs && guest_cbs->is_in_guest()) {
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+		if (guest_cbs->is_user_mode())
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 			misc |= PERF_RECORD_MISC_GUEST_USER;
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 		else
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 			misc |= PERF_RECORD_MISC_GUEST_KERNEL;