openkylin
/
linux
mirror of https://gitee.com/openkylin/linux.git
9
0
Fork 0
Code Issues Projects Releases Wiki Activity

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>
This commit is contained in:
Alexander Duyck 2012-11-16 13:57:32 -08:00 committed by H. Peter Anvin
parent fc8d782677
commit 217f155e9f
1 changed files with 2 additions and 2 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

4
arch/x86/kernel/ftrace.c
View 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);
}