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| author | Michael Ellerman <mpe@ellerman.id.au> | 2016-03-24 22:04:04 +1100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-04-14 15:47:06 +1000 |
| commit | 5d31a96e6c0187f2c5d7004e005fd094a1277e9e (patch) | |
| tree | 5d2bf3efea21bedf6a0df86b66f4c420fd06190e /arch/powerpc/kernel/process.c | |
| parent | f63e6d89876034c21ecd18bb1cd0d6c5b8da11a5 (diff) | |
| download | op-kernel-dev-5d31a96e6c0187f2c5d7004e005fd094a1277e9e.zip op-kernel-dev-5d31a96e6c0187f2c5d7004e005fd094a1277e9e.tar.gz | |
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/kernel/process.c')
| -rw-r--r-- | arch/powerpc/kernel/process.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c index dccc87e..a38ce49 100644 --- a/arch/powerpc/kernel/process.c +++ b/arch/powerpc/kernel/process.c @@ -55,6 +55,8 @@ #include <asm/firmware.h> #endif #include <asm/code-patching.h> +#include <asm/livepatch.h> + #include <linux/kprobes.h> #include <linux/kdebug.h> @@ -1267,13 +1269,15 @@ int copy_thread(unsigned long clone_flags, unsigned long usp, extern void ret_from_kernel_thread(void); void (*f)(void); unsigned long sp = (unsigned long)task_stack_page(p) + THREAD_SIZE; + struct thread_info *ti = task_thread_info(p); + + klp_init_thread_info(ti); /* Copy registers */ sp -= sizeof(struct pt_regs); childregs = (struct pt_regs *) sp; if (unlikely(p->flags & PF_KTHREAD)) { /* kernel thread */ - struct thread_info *ti = (void *)task_stack_page(p); memset(childregs, 0, sizeof(struct pt_regs)); childregs->gpr[1] = sp + sizeof(struct pt_regs); /* function */ |
