From: Borislav Petkov <bp@alien8.de>
To: Steven Rostedt <rostedt@goodmis.org>
Cc: tip-bot2 for Jiri Slaby <tip-bot2@linutronix.de>,
linux-kernel@vger.kernel.org, linux-tip-commits@vger.kernel.org,
Jiri Slaby <jslaby@suse.cz>, "H. Peter Anvin" <hpa@zytor.com>,
Ingo Molnar <mingo@redhat.com>,
Josh Poimboeuf <jpoimboe@redhat.com>,
linux-arch@vger.kernel.org,
Masami Hiramatsu <mhiramat@kernel.org>,
Peter Zijlstra <peterz@infradead.org>,
Thomas Gleixner <tglx@linutronix.de>, x86-ml <x86@kernel.org>,
Ingo Molnar <mingo@kernel.org>
Subject: [PATCH] x86/ftrace: Get rid of function_hook
Date: Mon, 21 Oct 2019 16:10:38 +0200 [thread overview]
Message-ID: <20191021141038.GC7014@zn.tnic> (raw)
In-Reply-To: <20191019073424.GA27353@zn.tnic>
From: Borislav Petkov <bp@suse.de>
function_hook is used as a better name than the default __fentry__
which is the profiling counter which gcc adds before every function's
prologue. Thus, it is not called from C and cannot have the same
semantics as a pure C function - it saves/restores regs so that a C
function can be called.
Drop the function_hook symbol and use __fentry__ directly for better
alignment with gcc's documentation.
Switch the marking to SYM_CODE_START/_END which is reserved for
non-standard, special functions.
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: Jonathan Corbet <corbet@lwn.net>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: linux-doc@vger.kernel.org
Cc: linux-kernel@vger.kernel.org
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: "Steven Rostedt (VMware)" <rostedt@goodmis.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86@kernel.org
---
Documentation/asm-annotations.rst | 4 ++--
arch/x86/kernel/ftrace_32.S | 8 +++-----
arch/x86/kernel/ftrace_64.S | 13 ++++++-------
3 files changed, 11 insertions(+), 14 deletions(-)
diff --git a/Documentation/asm-annotations.rst b/Documentation/asm-annotations.rst
index 29ccd6e61fe5..f55c2bb74d00 100644
--- a/Documentation/asm-annotations.rst
+++ b/Documentation/asm-annotations.rst
@@ -117,9 +117,9 @@ This section covers ``SYM_FUNC_*`` and ``SYM_CODE_*`` enumerated above.
So in most cases, developers should write something like in the following
example, having some asm instructions in between the macros, of course::
- SYM_FUNC_START(function_hook)
+ SYM_FUNC_START(memset)
... asm insns ...
- SYM_FUNC_END(function_hook)
+ SYM_FUNC_END(memset)
In fact, this kind of annotation corresponds to the now deprecated ``ENTRY``
and ``ENDPROC`` macros.
diff --git a/arch/x86/kernel/ftrace_32.S b/arch/x86/kernel/ftrace_32.S
index 8ed1f5d371f0..77be7e7e5e59 100644
--- a/arch/x86/kernel/ftrace_32.S
+++ b/arch/x86/kernel/ftrace_32.S
@@ -12,18 +12,16 @@
#include <asm/frame.h>
#include <asm/asm-offsets.h>
-# define function_hook __fentry__
-EXPORT_SYMBOL(__fentry__)
-
#ifdef CONFIG_FRAME_POINTER
# define MCOUNT_FRAME 1 /* using frame = true */
#else
# define MCOUNT_FRAME 0 /* using frame = false */
#endif
-SYM_FUNC_START(function_hook)
+SYM_CODE_START(__fentry__)
ret
-SYM_FUNC_END(function_hook)
+SYM_CODE_END(__fentry__)
+EXPORT_SYMBOL(__fentry__)
SYM_CODE_START(ftrace_caller)
diff --git a/arch/x86/kernel/ftrace_64.S b/arch/x86/kernel/ftrace_64.S
index 69c8d1b9119e..3029fe4f8547 100644
--- a/arch/x86/kernel/ftrace_64.S
+++ b/arch/x86/kernel/ftrace_64.S
@@ -14,9 +14,6 @@
.code64
.section .entry.text, "ax"
-# define function_hook __fentry__
-EXPORT_SYMBOL(__fentry__)
-
#ifdef CONFIG_FRAME_POINTER
/* Save parent and function stack frames (rip and rbp) */
# define MCOUNT_FRAME_SIZE (8+16*2)
@@ -132,9 +129,10 @@ EXPORT_SYMBOL(__fentry__)
#ifdef CONFIG_DYNAMIC_FTRACE
-SYM_FUNC_START(function_hook)
+SYM_CODE_START(__fentry__)
retq
-SYM_FUNC_END(function_hook)
+SYM_CODE_END(__fentry__)
+EXPORT_SYMBOL(__fentry__)
SYM_FUNC_START(ftrace_caller)
/* save_mcount_regs fills in first two parameters */
@@ -248,7 +246,7 @@ SYM_FUNC_END(ftrace_regs_caller)
#else /* ! CONFIG_DYNAMIC_FTRACE */
-SYM_FUNC_START(function_hook)
+SYM_CODE_START(__fentry__)
cmpq $ftrace_stub, ftrace_trace_function
jnz trace
@@ -279,7 +277,8 @@ trace:
restore_mcount_regs
jmp fgraph_trace
-SYM_FUNC_END(function_hook)
+SYM_CODE_END(__fentry__)
+EXPORT_SYMBOL(__fentry__)
#endif /* CONFIG_DYNAMIC_FTRACE */
#ifdef CONFIG_FUNCTION_GRAPH_TRACER
--
2.21.0
--
Regards/Gruss,
Boris.
https://people.kernel.org/tglx/notes-about-netiquette
next prev parent reply other threads:[~2019-10-21 14:11 UTC|newest]
Thread overview: 79+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-10-11 11:50 [PATCH v9 00/28] New macros for assembler symbols Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 01/28] linkage: Introduce new " Jiri Slaby
2019-10-14 9:31 ` Rafael J. Wysocki
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 02/28] x86/asm/suspend: Use SYM_DATA for data Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 03/28] x86/asm: Annotate relocate_kernel_{32,64}.c Jiri Slaby
2019-10-14 13:15 ` Borislav Petkov
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 04/28] x86/asm/entry: Annotate THUNKs Jiri Slaby
2019-10-14 13:38 ` Borislav Petkov
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 05/28] x86/asm: Annotate local pseudo-functions Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 06/28] x86/asm/crypto: Annotate local functions Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 07/28] x86/boot: " Jiri Slaby
2019-10-14 14:27 ` Borislav Petkov
2019-10-15 5:43 ` Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 08/28] x86/uaccess: Annotate local function Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 09/28] x86/asm: Annotate aliases Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 10/28] x86/asm/entry: Annotate interrupt symbols properly Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 11/28] x86/asm/head: Annotate data appropriately Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 12/28] x86/boot: " Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 13/28] um: " Jiri Slaby
2019-10-15 15:37 ` Richard Weinberger
2019-10-18 16:30 ` [tip: x86/asm] x86/um: " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 14/28] xen/pvh: " Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 15/28] x86/asm/purgatory: Start using annotations Jiri Slaby
2019-10-15 17:03 ` Borislav Petkov
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 16/28] x86/asm: Do not annotate functions by GLOBAL Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] x86/asm: Do not annotate functions with GLOBAL tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 17/28] x86/asm: Use SYM_INNER_LABEL instead of GLOBAL Jiri Slaby
2019-10-15 17:31 ` Borislav Petkov
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 18/28] x86/asm/realmode: Use SYM_DATA_* " Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:50 ` [PATCH v9 19/28] x86/asm: Kill the last GLOBAL user and remove the macro Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] x86/asm: Remove " tip-bot2 for Jiri Slaby
2019-10-11 11:51 ` [PATCH v9 20/28] x86/asm: Make some functions local Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-11 11:51 ` [PATCH v9 21/28] x86/asm/ftrace: Mark function_hook as function Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
2019-10-18 16:48 ` Steven Rostedt
2019-10-18 16:49 ` Steven Rostedt
2019-10-18 17:13 ` Borislav Petkov
2019-10-18 17:37 ` Steven Rostedt
2019-10-18 19:48 ` Borislav Petkov
2019-10-18 20:31 ` Steven Rostedt
2019-10-19 7:34 ` Borislav Petkov
2019-10-21 14:10 ` Borislav Petkov [this message]
2019-10-21 14:33 ` [PATCH] x86/ftrace: Get rid of function_hook Steven Rostedt
2019-10-22 11:38 ` Jiri Slaby
2019-10-22 12:56 ` Borislav Petkov
2019-10-22 12:57 ` [PATCH -v2] " Borislav Petkov
2019-10-25 9:00 ` [tip: x86/asm] " tip-bot2 for Borislav Petkov
2019-10-11 11:51 ` [PATCH v9 22/28] x86_64/asm: Add ENDs to some functions and relabel with SYM_CODE_* Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] x86/asm/64: " tip-bot2 for Jiri Slaby
2019-10-11 11:51 ` [PATCH v9 23/28] x86_64/asm: Change all ENTRY+END to SYM_CODE_* Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] x86/asm/64: " tip-bot2 for Jiri Slaby
2019-10-11 11:51 ` [PATCH v9 24/28] x86_64/asm: Change all ENTRY+ENDPROC to SYM_FUNC_* Jiri Slaby
2019-10-16 7:12 ` Borislav Petkov
2019-10-18 6:56 ` Herbert Xu
2019-10-11 11:51 ` [PATCH v9 25/28] x86_32/asm: Add ENDs to some functions and relabel with SYM_CODE_* Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] x86/asm/32: " tip-bot2 for Jiri Slaby
2019-10-11 11:51 ` [PATCH v9 26/28] x86_32/asm: Change all ENTRY+END to SYM_CODE_* Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] x86/asm/32: " tip-bot2 for Jiri Slaby
2019-10-11 11:51 ` [PATCH v9 27/28] x86_32/asm: Change all ENTRY+ENDPROC to SYM_FUNC_* Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] x86/asm/32: " tip-bot2 for Jiri Slaby
2019-10-11 11:51 ` [PATCH v9 28/28] x86/asm: Replace WEAK uses by SYM_INNER_LABEL_ALIGN Jiri Slaby
2019-10-18 16:30 ` [tip: x86/asm] " tip-bot2 for Jiri Slaby
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