linux-kernel - [RFC PATCH 08/14] powerpc/ftrace: Use FTRACE_REGS_ADDR to identify the correct ftrace trampoline

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Date:   Thu, 26 Nov 2020 23:38:45 +0530
From:   "Naveen N. Rao" <naveen.n.rao@...ux.vnet.ibm.com>
To:     Steven Rostedt <rostedt@...dmis.org>,
        Michael Ellerman <mpe@...erman.id.au>
Cc:     <linux-kernel@...r.kernel.org>, <linuxppc-dev@...ts.ozlabs.org>
Subject: [RFC PATCH 08/14] powerpc/ftrace: Use FTRACE_REGS_ADDR to identify the correct ftrace trampoline

Use FTRACE_REGS_ADDR instead of keying off
CONFIG_DYNAMIC_FTRACE_WITH_REGS to identify the proper ftrace trampoline
address to use.

Signed-off-by: Naveen N. Rao <naveen.n.rao@...ux.vnet.ibm.com>
---
 arch/powerpc/kernel/trace/ftrace.c | 12 ++----------
 1 file changed, 2 insertions(+), 10 deletions(-)

diff --git a/arch/powerpc/kernel/trace/ftrace.c b/arch/powerpc/kernel/trace/ftrace.c
index 4fe5f373172fd2..14b39f7797d455 100644
--- a/arch/powerpc/kernel/trace/ftrace.c
+++ b/arch/powerpc/kernel/trace/ftrace.c
@@ -361,11 +361,7 @@ static int setup_mcount_compiler_tramp(unsigned long tramp)
 	}
 
 	/* Let's re-write the tramp to go to ftrace_[regs_]caller */
-#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
-	ptr = ppc_global_function_entry((void *)ftrace_regs_caller);
-#else
-	ptr = ppc_global_function_entry((void *)ftrace_caller);
-#endif
+	ptr = ppc_global_function_entry((void *)FTRACE_REGS_ADDR);
 	if (create_branch(&instr, (void *)tramp, ptr, 0)) {
 		pr_debug("%ps is not reachable from existing mcount tramp\n",
 				(void *)ptr);
@@ -885,11 +881,7 @@ int __init ftrace_dyn_arch_init(void)
 		0x7d8903a6,		/* mtctr   r12			*/
 		0x4e800420,		/* bctr				*/
 	};
-#ifdef CONFIG_DYNAMIC_FTRACE_WITH_REGS
-	unsigned long addr = ppc_global_function_entry((void *)ftrace_regs_caller);
-#else
-	unsigned long addr = ppc_global_function_entry((void *)ftrace_caller);
-#endif
+	unsigned long addr = ppc_global_function_entry((void *)FTRACE_REGS_ADDR);
 	long reladdr = addr - kernel_toc_addr();
 
 	if (reladdr > 0x7FFFFFFF || reladdr < -(0x80000000L)) {
-- 
2.25.4