Commit-ID: c763ba06bd9b5db2c46c36276c89103d92d2c604
Gitweb: http://git.kernel.org/tip/c763ba06bd9b5db2c46c36276c89103d92d2c604
Author: Ian Munsie <imunsie@xxxxxxxxxxx>
AuthorDate: Thu, 3 Feb 2011 14:27:22 +1100
Committer: Steven Rostedt <rostedt@xxxxxxxxxxx>
CommitDate: Mon, 7 Feb 2011 21:26:22 -0500
tracing/syscalls: Make arch_syscall_addr weak
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@xxxxxxxxxxx>
LKML-Reference: <1296703645-18718-4-git-send-email-imunsie@xxxxxxxxxxx>
Signed-off-by: Steven Rostedt <rostedt@xxxxxxxxxxx>
---
Documentation/trace/ftrace-design.txt | 3 +++
kernel/trace/trace_syscalls.c | 2 +-
2 files changed, 4 insertions(+), 1 deletions(-)
diff --git a/Documentation/trace/ftrace-design.txt b/Documentation/trace/ftrace-design.txt
index dc52bd4..6fca17b 100644
--- a/Documentation/trace/ftrace-design.txt
+++ b/Documentation/trace/ftrace-design.txt
@@ -247,6 +247,9 @@ You need very few things to get the syscalls tracing in an arch.
- Support the TIF_SYSCALL_TRACEPOINT thread flags.
- Put the trace_sys_enter() and trace_sys_exit() tracepoints calls from ptrace
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.
diff --git a/kernel/trace/trace_syscalls.c b/kernel/trace/trace_syscalls.c
index 4230942..af83154 100644
--- a/kernel/trace/trace_syscalls.c
+++ b/kernel/trace/trace_syscalls.c
@@ -446,7 +446,7 @@ int init_syscall_trace(struct ftrace_event_call *call)
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];
}
--
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