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From: Frederic Weisbecker on 17 Mar 2010 15:20
On Tue, Mar 16, 2010 at 01:46:17PM -0400, Jason Baron wrote:
> Add arch_compat_syscall_addr(int nr) for x86_64. This is in preparation for adding
> compat syscall support to the event tracer.
>
> Signed-off-by: Jason Baron <jbaron(a)redhat.com>
> ---
> arch/x86/include/asm/syscall.h | 5 +++++
> arch/x86/kernel/ftrace.c | 8 ++++++++
> 2 files changed, 13 insertions(+), 0 deletions(-)
>
> diff --git a/arch/x86/include/asm/syscall.h b/arch/x86/include/asm/syscall.h
> index c4a348f..4e462cc 100644
> --- a/arch/x86/include/asm/syscall.h
> +++ b/arch/x86/include/asm/syscall.h
> @@ -16,7 +16,12 @@
> #include <linux/sched.h>
> #include <linux/err.h>
>
> +#if defined(CONFIG_COMPAT) && defined(CONFIG_FTRACE_SYSCALLS)
> + #define __HAVE_ARCH_FTRACE_COMPAT_SYSCALLS
> +#endif
> +



A config would be better:

arch/Kconfig:

config HAVE_COMPAT_FTRACE_SYSCALLS
bool

config COMPAT_FTRACE_SYSCALLS
def_bool y
depends on COMPAT && FTRACE_SYSCALLS && HAVE_COMPAT_FTRACE_SYSCALLS

arch/x86/Kconfig:

config X86
[...]
select HAVE_COMPAT_FTRACE_SYSCALLS
[...]

So that we centralize the definition of COMPAT_FTRACE_SYSCALLS and
we don't need every archs to redefine the dependency and to stay sync
with potential dependency changes.

Thanks.



> extern const unsigned long sys_call_table[];
> +extern const unsigned long *ia32_sys_call_table;
>
> /*
> * Only the low 32 bits of orig_ax are meaningful, so we return int.
> diff --git a/arch/x86/kernel/ftrace.c b/arch/x86/kernel/ftrace.c
> index cd37469..4b36a0b 100644
> --- a/arch/x86/kernel/ftrace.c
> +++ b/arch/x86/kernel/ftrace.c
> @@ -26,6 +26,7 @@
> #include <asm/ftrace.h>
> #include <asm/nops.h>
> #include <asm/nmi.h>
> +#include <asm/syscall.h>
>
>
> #ifdef CONFIG_DYNAMIC_FTRACE
> @@ -510,3 +511,10 @@ void prepare_ftrace_return(unsigned long *parent, unsigned long self_addr,
> }
> }
> #endif /* CONFIG_FUNCTION_GRAPH_TRACER */
> +
> +#ifdef __HAVE_ARCH_FTRACE_COMPAT_SYSCALLS
> +unsigned long __init arch_compat_syscall_addr(int nr)
> +{
> + return (unsigned long)(&ia32_sys_call_table)[nr];
> +}
> +#endif
> --
> 1.6.5.1
>

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Prev: perf probe: Accessing members in data structures
Next: [PATCH 4/4] exit: avoid sig->count in __exit_signal() to detect the group-dead case