kprobes broken in linux-next (was Re: [tip:perf/kprobes] kprobes: Introduce NOKPROBE_SYMBOL() macro to maintain kprobes blacklist)

[Vineet Gupta]

On Thursday 24 April 2014 04:28 PM, tip-bot for Masami Hiramatsu wrote:
> Commit-ID:  376e242429bf8539ef39a080ac113c8799840b13
> Gitweb:     http://git.kernel.org/tip/376e242429bf8539ef39a080ac113c8799840b13
> Author:     Masami Hiramatsu <masami.hiramatsu.pt@xxxxxxxxxxx>
> AuthorDate: Thu, 17 Apr 2014 17:17:05 +0900
> Committer:  Ingo Molnar <mingo@xxxxxxxxxx>
> CommitDate: Thu, 24 Apr 2014 10:02:56 +0200
> 
> kprobes: Introduce NOKPROBE_SYMBOL() macro to maintain kprobes blacklist
> 
> Introduce NOKPROBE_SYMBOL() macro which builds a kprobes
> blacklist at kernel build time.
> 
....

> diff --git a/include/asm-generic/vmlinux.lds.h b/include/asm-generic/vmlinux.lds.h
> index 146e4ff..40ceb3c 100644
> --- a/include/asm-generic/vmlinux.lds.h
> +++ b/include/asm-generic/vmlinux.lds.h
> @@ -109,6 +109,14 @@
>  #define BRANCH_PROFILE()
>  #endif
>  
> +#ifdef CONFIG_KPROBES
> +#define KPROBE_BLACKLIST()	VMLINUX_SYMBOL(__start_kprobe_blacklist) = .; \
> +				*(_kprobe_blacklist)			      \
> +				VMLINUX_SYMBOL(__stop_kprobe_blacklist) = .;
> +#else
> +#define KPROBE_BLACKLIST()
> +#endif
> +
>  #ifdef CONFIG_EVENT_TRACING
>  #define FTRACE_EVENTS()	. = ALIGN(8);					\
>  			VMLINUX_SYMBOL(__start_ftrace_events) = .;	\
> @@ -507,6 +515,7 @@
>  	*(.init.rodata)							\
>  	FTRACE_EVENTS()							\
>  	TRACE_SYSCALLS()						\
> +	KPROBE_BLACKLIST()						\
>  	MEM_DISCARD(init.rodata)					\
>  	CLK_OF_TABLES()							\
>  	RESERVEDMEM_OF_TABLES()						\

Linux-next fails to boot on ARC due to misaligned __start_kprobe_blacklist. Patch
below fixes it.

------------------------>