diff options
| author | Alexander Duyck <alexander.h.duyck@intel.com> | 2012-11-16 22:57:32 +0100 |
|---|---|---|
| committer | H. Peter Anvin <hpa@linux.intel.com> | 2012-11-17 01:42:09 +0100 |
| commit | 217f155e9fc68bf2a6c58a7b47e0d1ce68d78818 (patch) | |
| tree | dec7fde874eb98b5520d936e38acd9b93d14c9ca | |
| parent | x86: Use __pa_symbol instead of __pa on C visible symbols (diff) | |
| download | linux-217f155e9fc68bf2a6c58a7b47e0d1ce68d78818.tar.xz linux-217f155e9fc68bf2a6c58a7b47e0d1ce68d78818.zip | |
x86/ftrace: Use __pa_symbol instead of __pa on C visible symbols
Instead of using __pa which is meant to be a general function for converting
virtual addresses to physical addresses we can use __pa_symbol which is the
preferred way of decoding kernel text virtual addresses to physical addresses.
In this case we are not directly converting C visible symbols however if we
know that the instruction pointer is somewhere between _text and _etext we
know that we are going to be translating an address form the kernel text
space.
Cc: Steven Rostedt <rostedt@goodmis.org>
Cc: Frederic Weisbecker <fweisbec@gmail.com>
Signed-off-by: Alexander Duyck <alexander.h.duyck@intel.com>
Link: http://lkml.kernel.org/r/20121116215718.8521.24026.stgit@ahduyck-cp1.jf.intel.com
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
| -rw-r--r-- | arch/x86/kernel/ftrace.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c index 1d414029f1d8..42a392a9fd02 100644 --- a/arch/x86/kernel/ftrace.c +++ b/arch/x86/kernel/ftrace.c @@ -89,7 +89,7 @@ do_ftrace_mod_code(unsigned long ip, const void *new_code) * kernel identity mapping to modify code. */ if (within(ip, (unsigned long)_text, (unsigned long)_etext)) - ip = (unsigned long)__va(__pa(ip)); + ip = (unsigned long)__va(__pa_symbol(ip)); return probe_kernel_write((void *)ip, new_code, MCOUNT_INSN_SIZE); } @@ -279,7 +279,7 @@ static int ftrace_write(unsigned long ip, const char *val, int size) * kernel identity mapping to modify code. */ if (within(ip, (unsigned long)_text, (unsigned long)_etext)) - ip = (unsigned long)__va(__pa(ip)); + ip = (unsigned long)__va(__pa_symbol(ip)); return probe_kernel_write((void *)ip, val, size); } |