Subject: [PATCH 3/5] powerpc: ftrace, added missing icache flush

From: Steven Rostedt <[email-masked]>
Date: Wed, 26 Nov 2008 16:58:24 -0500

From: Steven Rostedt <[email-masked]>

Impact: fix to PowerPC code modification

After modifying code it is essential to flush the icache. This patch
adds the missing flush.

Reported-by: Paul Mackerras <[email-masked]>
Signed-off-by: Steven Rostedt <[email-masked]>
---
 arch/powerpc/kernel/ftrace.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/arch/powerpc/kernel/ftrace.c b/arch/powerpc/kernel/ftrace.c
index ea454a0..a4640e4 100644
--- a/arch/powerpc/kernel/ftrace.c
+++ b/arch/powerpc/kernel/ftrace.c
@@ -271,6 +271,9 @@ __ftrace_make_nop(struct module *mod,
 	if (probe_kernel_write((void *)ip, &op, MCOUNT_INSN_SIZE))
 		return -EPERM;
 
+
+	flush_icache_range(ip, ip + 8);
+
 	return 0;
 }
 
@@ -342,6 +345,8 @@ __ftrace_make_nop(struct module *mod,
 	if (probe_kernel_write((void *)ip, &op, MCOUNT_INSN_SIZE))
 		return -EPERM;
 
+	flush_icache_range(ip, ip + 8);
+
 	return 0;
 }
 #endif /* PPC64 */
@@ -438,6 +443,8 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
 	if (probe_kernel_write((void *)ip, op, MCOUNT_INSN_SIZE * 2))
 		return -EPERM;
 
+	flush_icache_range(ip, ip + 8);
+
 	return 0;
 }
 #else
@@ -481,6 +488,8 @@ __ftrace_make_call(struct dyn_ftrace *rec, unsigned long addr)
 	if (probe_kernel_write((void *)ip, &op, MCOUNT_INSN_SIZE))
 		return -EPERM;
 
+	flush_icache_range(ip, ip + 8);
+
 	return 0;
 }
 #endif /* CONFIG_PPC64 */
-- 
1.5.6.5

--