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| author | Steven Rostedt (Red Hat) <rostedt@goodmis.org> | 2014-06-25 17:59:45 +0200 |
|---|---|---|
| committer | Steven Rostedt <rostedt@goodmis.org> | 2014-07-18 19:57:02 +0200 |
| commit | fdc841b58cf5268fa349eaf9f74fd9a8c6944a34 (patch) | |
| tree | c2a7617a5785be7c3b396c09e1ccf1192b60a6b0 | |
| parent | ftrace: Remove check for HAVE_FUNCTION_TRACE_MCOUNT_TEST (diff) | |
| download | linux-fdc841b58cf5268fa349eaf9f74fd9a8c6944a34.tar.xz linux-fdc841b58cf5268fa349eaf9f74fd9a8c6944a34.zip | |
ftrace: x86: Remove check of obsolete variable function_trace_stop
Nothing sets function_trace_stop to disable function tracing anymore.
Remove the check for it in the arch code.
Link: http://lkml.kernel.org/r/53C54D32.6000000@zytor.com
Acked-by: H. Peter Anvin <hpa@linux.intel.com>
Reviewed-by: Masami Hiramatsu <masami.hiramatsu.pt@hitachi.com>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
| -rw-r--r-- | arch/x86/Kconfig | 1 | ||||
| -rw-r--r-- | arch/x86/kernel/entry_32.S | 9 | ||||
| -rw-r--r-- | arch/x86/kernel/mcount_64.S | 18 |
3 files changed, 1 insertions, 27 deletions
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig index a8f749ef0fdc..5b45e8fccaca 100644 --- a/arch/x86/Kconfig +++ b/arch/x86/Kconfig @@ -54,7 +54,6 @@ config X86 select HAVE_FUNCTION_TRACER select HAVE_FUNCTION_GRAPH_TRACER select HAVE_FUNCTION_GRAPH_FP_TEST - select HAVE_FUNCTION_TRACE_MCOUNT_TEST select HAVE_SYSCALL_TRACEPOINTS select SYSCTL_EXCEPTION_TRACE select HAVE_KVM diff --git a/arch/x86/kernel/entry_32.S b/arch/x86/kernel/entry_32.S index dbaa23e78b36..64762c62e8a7 100644 --- a/arch/x86/kernel/entry_32.S +++ b/arch/x86/kernel/entry_32.S @@ -1058,9 +1058,6 @@ ENTRY(mcount) END(mcount) ENTRY(ftrace_caller) - cmpl $0, function_trace_stop - jne ftrace_stub - pushl %eax pushl %ecx pushl %edx @@ -1092,8 +1089,6 @@ END(ftrace_caller) ENTRY(ftrace_regs_caller) pushf /* push flags before compare (in cs location) */ - cmpl $0, function_trace_stop - jne ftrace_restore_flags /* * i386 does not save SS and ESP when coming from kernel. @@ -1152,7 +1147,6 @@ GLOBAL(ftrace_regs_call) popf /* Pop flags at end (no addl to corrupt flags) */ jmp ftrace_ret -ftrace_restore_flags: popf jmp ftrace_stub #else /* ! CONFIG_DYNAMIC_FTRACE */ @@ -1161,9 +1155,6 @@ ENTRY(mcount) cmpl $__PAGE_OFFSET, %esp jb ftrace_stub /* Paging not enabled yet? */ - cmpl $0, function_trace_stop - jne ftrace_stub - cmpl $ftrace_stub, ftrace_trace_function jnz trace #ifdef CONFIG_FUNCTION_GRAPH_TRACER diff --git a/arch/x86/kernel/mcount_64.S b/arch/x86/kernel/mcount_64.S index 6b4e3c3b3d74..c73aecf10d34 100644 --- a/arch/x86/kernel/mcount_64.S +++ b/arch/x86/kernel/mcount_64.S @@ -46,10 +46,6 @@ END(function_hook) .endm ENTRY(ftrace_caller) - /* Check if tracing was disabled (quick check) */ - cmpl $0, function_trace_stop - jne ftrace_stub - ftrace_caller_setup /* regs go into 4th parameter (but make it NULL) */ movq $0, %rcx @@ -73,10 +69,6 @@ ENTRY(ftrace_regs_caller) /* Save the current flags before compare (in SS location)*/ pushfq - /* Check if tracing was disabled (quick check) */ - cmpl $0, function_trace_stop - jne ftrace_restore_flags - /* skip=8 to skip flags saved in SS */ ftrace_caller_setup 8 @@ -131,7 +123,7 @@ GLOBAL(ftrace_regs_call) popfq jmp ftrace_return -ftrace_restore_flags: + popfq jmp ftrace_stub @@ -141,9 +133,6 @@ END(ftrace_regs_caller) #else /* ! CONFIG_DYNAMIC_FTRACE */ ENTRY(function_hook) - cmpl $0, function_trace_stop - jne ftrace_stub - cmpq $ftrace_stub, ftrace_trace_function jnz trace @@ -182,10 +171,6 @@ END(function_hook) ENTRY(ftrace_graph_caller) MCOUNT_SAVE_FRAME - /* Check if tracing was disabled (quick check) */ - cmpl $0, function_trace_stop - jne fgraph_skip - #ifdef CC_USING_FENTRY leaq SS+16(%rsp), %rdi movq $0, %rdx /* No framepointers needed */ @@ -198,7 +183,6 @@ ENTRY(ftrace_graph_caller) call prepare_ftrace_return -fgraph_skip: MCOUNT_RESTORE_FRAME retq |