x86/ftrace: Use __pa_symbol instead of __pa on C visible symbols
authorAlexander Duyck <alexander.h.duyck@intel.com>
Fri, 16 Nov 2012 21:57:32 +0000 (13:57 -0800)
committerH. Peter Anvin <hpa@linux.intel.com>
Sat, 17 Nov 2012 00:42:09 +0000 (16:42 -0800)
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>
arch/x86/kernel/ftrace.c

index 1d414029f1d800ff67ae21bd2e74794ad06efa32..42a392a9fd02fd3c0e306e3a4f4da323444dc3fd 100644 (file)
@@ -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);
 }