path: root/Documentation/trace
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authorIan Munsie <imunsie@au1.ibm.com>2011-02-03 14:27:23 +1100
committerSteven Rostedt <rostedt@goodmis.org>2011-02-07 21:29:03 -0500
commitb2d55496818d64310b9f5486d4eea76ea614d7f8 (patch)
treeb31ea491ae7d02c6375457fa3269fa0289fd8fb4 /Documentation/trace
parentc763ba06bd9b5db2c46c36276c89103d92d2c604 (diff)
tracing/syscalls: Allow arch specific syscall symbol matching
Some architectures have unusual symbol names and the generic code to match the symbol name with the function name for the syscall metadata will fail. For example, symbols on PPC64 start with a period and the generic code will fail to match them. This patch moves the match logic out into a separate function which an arch can override by defining ARCH_HAS_SYSCALL_MATCH_SYM_NAME in asm/ftrace.h and implementing arch_syscall_match_sym_name. Signed-off-by: Ian Munsie <imunsie@au1.ibm.com> LKML-Reference: <1296703645-18718-5-git-send-email-imunsie@au1.ibm.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
Diffstat (limited to 'Documentation/trace')
1 files changed, 4 insertions, 0 deletions
diff --git a/Documentation/trace/ftrace-design.txt b/Documentation/trace/ftrace-design.txt
index 6fca17beee2..79fcafc7fd6 100644
--- a/Documentation/trace/ftrace-design.txt
+++ b/Documentation/trace/ftrace-design.txt
@@ -250,6 +250,10 @@ You need very few things to get the syscalls tracing in an arch.
- 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.
+- If the symbol names of the system calls do not match the function names on
+ this arch, define ARCH_HAS_SYSCALL_MATCH_SYM_NAME in asm/ftrace.h and
+ implement arch_syscall_match_sym_name with the appropriate logic to return
+ true if the function name corresponds with the symbol name.