Commit be10ab10 authored by Steven Rostedt's avatar Steven Rostedt Committed by Steven Rostedt

powerpc64/ftrace: use PACA to retrieve TOC in mod_return_to_handler

The mod_return_to_handler needs to switch to the kernel TOC before
jumping to a the kernel code. It currently does this by looking
at the kernel function data and retrieves the TOC that way.

Not only is this inefficient, it also breaks with a relocatable kernel.
The PACA contains the kernel TOC and we can easily retrieve it that
way.
Reported-by: default avatarSachin Sant <sachinp@in.ibm.com>
Signed-off-by: default avatarSteven Rostedt <rostedt@goodmis.org>
parent 9135c3cc
......@@ -1038,8 +1038,7 @@ _GLOBAL(mod_return_to_handler)
* We are in a module using the module's TOC.
* Switch to our TOC to run inside the core kernel.
*/
LOAD_REG_IMMEDIATE(r4,ftrace_return_to_handler)
ld r2, 8(r4)
ld r2, PACATOC(r13)
bl .ftrace_return_to_handler
nop
......
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