diff options
Diffstat (limited to 'arch/metag/kernel/ftrace.c')
| -rw-r--r-- | arch/metag/kernel/ftrace.c | 11 |
1 files changed, 5 insertions, 6 deletions
diff --git a/arch/metag/kernel/ftrace.c b/arch/metag/kernel/ftrace.c index ed1d685157c2..ac8c039b0318 100644 --- a/arch/metag/kernel/ftrace.c +++ b/arch/metag/kernel/ftrace.c @@ -54,12 +54,11 @@ static int ftrace_modify_code(unsigned long pc, unsigned char *old_code, unsigned char replaced[MCOUNT_INSN_SIZE]; /* - * Note: Due to modules and __init, code can - * disappear and change, we need to protect against faulting - * as well as code changing. - * - * No real locking needed, this code is run through - * kstop_machine. + * Note: + * We are paranoid about modifying text, as if a bug was to happen, it + * could cause us to read or write to someplace that could cause harm. + * Carefully read and modify the code with probe_kernel_*(), and make + * sure what we read is what we expected it to be before modifying it. */ /* read the text we want to modify */ |