powerpc/module: Create a special stub for ftrace_caller()

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In order to support the new -mprofile-kernel ABI, we need to be able to
call from the module back to ftrace_caller() (in the kernel) without
using the module's r2. That is because the function in this module which
is calling ftrace_caller() may not have setup r2, if it doesn't
otherwise need it (ie. it accesses no globals).

To make that work we add a new stub which is used for calling
ftrace_caller(), which uses the kernel toc instead of the module toc.

Reviewed-by: Balbir Singh <bsingharora@gmail.com>
Reviewed-by: Torsten Duwe <duwe@suse.de>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>

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Michael Ellerman 2016-03-03 15:26:56 +11:00

parent f17c4e01e9

commit 336a7b5dd8

1 changed files with 68 additions and 1 deletions

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arch/powerpc/kernel/module_64.c

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