1 files changed, 0 insertions, 97 deletions
diff --git a/arch/metag/kernel/perf_callchain.c b/arch/metag/kernel/perf_callchain.c
deleted file mode 100644
index d325ba101de0..000000000000
--- a/arch/metag/kernel/perf_callchain.c
+++ /dev/null
@@ -1,97 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0
-/*
- * Perf callchain handling code.
- *
- *   Based on the ARM perf implementation.
- */
-
-#include <linux/kernel.h>
-#include <linux/sched.h>
-#include <linux/perf_event.h>
-#include <linux/uaccess.h>
-#include <asm/ptrace.h>
-#include <asm/stacktrace.h>
-
-static bool is_valid_call(unsigned long calladdr)
-{
-	unsigned int callinsn;
-
-	/* Check the possible return address is aligned. */
-	if (!(calladdr & 0x3)) {
-		if (!get_user(callinsn, (unsigned int *)calladdr)) {
-			/* Check for CALLR or SWAP PC,D1RtP. */
-			if ((callinsn & 0xff000000) == 0xab000000 ||
-			    callinsn == 0xa3200aa0)
-				return true;
-		}
-	}
-	return false;
-}
-
-static struct metag_frame __user *
-user_backtrace(struct metag_frame __user *user_frame,
-	       struct perf_callchain_entry_ctx *entry)
-{
-	struct metag_frame frame;
-	unsigned long calladdr;
-
-	/* We cannot rely on having frame pointers in user code. */
-	while (1) {
-		/* Also check accessibility of one struct frame beyond */
-		if (!access_ok(VERIFY_READ, user_frame, sizeof(frame)))
-			return 0;
-		if (__copy_from_user_inatomic(&frame, user_frame,
-					      sizeof(frame)))
-			return 0;
-
-		--user_frame;
-
-		calladdr = frame.lr - 4;
-		if (is_valid_call(calladdr)) {
-			perf_callchain_store(entry, calladdr);
-			return user_frame;
-		}
-	}
-
-	return 0;
-}
-
-void
-perf_callchain_user(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
-{
-	unsigned long sp = regs->ctx.AX[0].U0;
-	struct metag_frame __user *frame;
-
-	frame = (struct metag_frame __user *)sp;
-
-	--frame;
-
-	while ((entry->nr < entry->max_stack) && frame)
-		frame = user_backtrace(frame, entry);
-}
-
-/*
- * Gets called by walk_stackframe() for every stackframe. This will be called
- * whist unwinding the stackframe and is like a subroutine return so we use
- * the PC.
- */
-static int
-callchain_trace(struct stackframe *fr,
-		void *data)
-{
-	struct perf_callchain_entry_ctx *entry = data;
-	perf_callchain_store(entry, fr->pc);
-	return 0;
-}
-
-void
-perf_callchain_kernel(struct perf_callchain_entry_ctx *entry, struct pt_regs *regs)
-{
-	struct stackframe fr;
-
-	fr.fp = regs->ctx.AX[1].U0;
-	fr.sp = regs->ctx.AX[0].U0;
-	fr.lr = regs->ctx.DX[4].U1;
-	fr.pc = regs->ctx.CurrPC;
-	walk_stackframe(&fr, callchain_trace, entry);
-}