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| author | Michael Ellerman <mpe@ellerman.id.au> | 2016-03-24 12:04:04 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-04-14 07:47:06 +0200 |
| commit | 5d31a96e6c0187f2c5d7004e005fd094a1277e9e (patch) | |
| tree | 5d2bf3efea21bedf6a0df86b66f4c420fd06190e /arch/powerpc/include/asm/livepatch.h | |
| parent | powerpc/livepatch: Add livepatch header (diff) | |
| download | linux-5d31a96e6c0187f2c5d7004e005fd094a1277e9e.tar.xz linux-5d31a96e6c0187f2c5d7004e005fd094a1277e9e.zip | |
powerpc/livepatch: Add livepatch stack to struct thread_info
In order to support live patching we need to maintain an alternate
stack of TOC & LR values. We use the base of the stack for this, and
store the "live patch stack pointer" in struct thread_info.
Unlike the other fields of thread_info, we can not statically initialise
that value, so it must be done at run time.
This patch just adds the code to support that, it is not enabled until
the next patch which actually adds live patch support.
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Acked-by: Balbir Singh <bsingharora@gmail.com>
Diffstat (limited to 'arch/powerpc/include/asm/livepatch.h')
| -rw-r--r-- | arch/powerpc/include/asm/livepatch.h | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/powerpc/include/asm/livepatch.h b/arch/powerpc/include/asm/livepatch.h index ad36e8e34fa1..a402f7f94896 100644 --- a/arch/powerpc/include/asm/livepatch.h +++ b/arch/powerpc/include/asm/livepatch.h @@ -49,6 +49,14 @@ static inline unsigned long klp_get_ftrace_location(unsigned long faddr) */ return ftrace_location_range(faddr, faddr + 16); } + +static inline void klp_init_thread_info(struct thread_info *ti) +{ + /* + 1 to account for STACK_END_MAGIC */ + ti->livepatch_sp = (unsigned long *)(ti + 1) + 1; +} +#else +static void klp_init_thread_info(struct thread_info *ti) { } #endif /* CONFIG_LIVEPATCH */ #endif /* _ASM_POWERPC_LIVEPATCH_H */ |