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tracing/syscalls: Make arch_syscall_addr weak

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Some architectures use non-trivial system call tables and will not work
with the generic arch_syscall_addr code. For example, PowerPC64 uses a
table of twin long longs.

This patch makes the generic arch_syscall_addr weak to allow
architectures with non-trivial system call tables to override it.

Signed-off-by: Ian Munsie <imunsie@au1.ibm.com>
LKML-Reference: <1296703645-18718-4-git-send-email-imunsie@au1.ibm.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Ian Munsie 2011-02-03 14:27:22 +11:00 • committed by Steven Rostedt
parent 3773b389b6
commit c763ba06bd
2 changed files with 4 additions and 1 deletions
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3
Documentation/trace/ftrace-design.txt
View file

@ -247,6 +247,9 @@ You need very few things to get the syscalls tracing in an arch.
- Support the TIF_SYSCALL_TRACEPOINT thread flags. - Support the TIF_SYSCALL_TRACEPOINT thread flags.
- Put the trace_sys_enter() and trace_sys_exit() tracepoints calls from ptrace - Put the trace_sys_enter() and trace_sys_exit() tracepoints calls from ptrace
in the ptrace syscalls tracing path. in the ptrace syscalls tracing path.
- If the system call table on this arch is more complicated than a simple array
of addresses of the system calls, implement an arch_syscall_addr to return
the address of a given system call.
- Tag this arch as HAVE_SYSCALL_TRACEPOINTS. - Tag this arch as HAVE_SYSCALL_TRACEPOINTS.

2
kernel/trace/trace_syscalls.c
View file

@ -446,7 +446,7 @@ int init_syscall_trace(struct ftrace_event_call *call)
return id; return id;
} }
unsigned long __init arch_syscall_addr(int nr) unsigned long __init __weak arch_syscall_addr(int nr)
{ {
return (unsigned long)sys_call_table[nr]; return (unsigned long)sys_call_table[nr];
} }