From: David Woodhouse <dwmw@amazon.co.uk>
To: Andi Kleen <ak@linux.intel.com>
Cc: Paul Turner <pjt@google.com>, LKML <linux-kernel@vger.kernel.org>,
Linus Torvalds <torvalds@linux-foundation.org>,
Greg Kroah-Hartman <gregkh@linux-foundation.org>,
Tim Chen <tim.c.chen@linux.intel.com>,
Dave Hansen <dave.hansen@intel.com>,
tglx@linutronix.de, Kees Cook <keescook@google.com>,
Rik van Riel <riel@redhat.com>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@amacapital.net>,
Jiri Kosina <jikos@kernel.org>,
gnomes@lxorguk.ukuu.org.uk
Subject: [PATCH v5 11/12] x86/retpoline: Exclude objtool with retpoline
Date: Sat, 6 Jan 2018 11:49:33 +0000 [thread overview]
Message-ID: <1515239374-23361-12-git-send-email-dwmw@amazon.co.uk> (raw)
In-Reply-To: <1515239374-23361-1-git-send-email-dwmw@amazon.co.uk>
From: Andi Kleen <ak@linux.intel.com>
objtool's assembler nanny currently cannot deal with the code generated
by the retpoline compiler and throws hundreds of warnings, mostly
because it sees calls that don't have a symbolic target.
Exclude all the options that rely on objtool when RETPOLINE is active.
This mainly means that we use the frame pointer unwinder and livepatch
is not supported.
Eventually objtool can be fixed to handle this.
Signed-off-by: Andi Kleen <ak@linux.intel.com>
Signed-off-by: David Woodhouse <dwmw@amazon.co.uk>
---
arch/x86/Kconfig | 4 ++--
arch/x86/Kconfig.debug | 6 +++---
2 files changed, 5 insertions(+), 5 deletions(-)
diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 77c58ae..651d25f 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -171,8 +171,8 @@ config X86
select HAVE_PERF_USER_STACK_DUMP
select HAVE_RCU_TABLE_FREE
select HAVE_REGS_AND_STACK_ACCESS_API
- select HAVE_RELIABLE_STACKTRACE if X86_64 && UNWINDER_FRAME_POINTER && STACK_VALIDATION
- select HAVE_STACK_VALIDATION if X86_64
+ select HAVE_RELIABLE_STACKTRACE if X86_64 && UNWINDER_FRAME_POINTER && STACK_VALIDATION && !RETPOLINE
+ select HAVE_STACK_VALIDATION if X86_64 && !RETPOLINE
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_UNSTABLE_SCHED_CLOCK
select HAVE_USER_RETURN_NOTIFIER
diff --git a/arch/x86/Kconfig.debug b/arch/x86/Kconfig.debug
index 6293a87..9f3928d 100644
--- a/arch/x86/Kconfig.debug
+++ b/arch/x86/Kconfig.debug
@@ -359,8 +359,8 @@ config PUNIT_ATOM_DEBUG
choice
prompt "Choose kernel unwinder"
- default UNWINDER_ORC if X86_64
- default UNWINDER_FRAME_POINTER if X86_32
+ default UNWINDER_ORC if X86_64 && !RETPOLINE
+ default UNWINDER_FRAME_POINTER if X86_32 || RETPOLINE
---help---
This determines which method will be used for unwinding kernel stack
traces for panics, oopses, bugs, warnings, perf, /proc/<pid>/stack,
@@ -368,7 +368,7 @@ choice
config UNWINDER_ORC
bool "ORC unwinder"
- depends on X86_64
+ depends on X86_64 && !RETPOLINE
select STACK_VALIDATION
---help---
This option enables the ORC (Oops Rewind Capability) unwinder for
--
2.7.4
next prev parent reply other threads:[~2018-01-06 11:50 UTC|newest]
Thread overview: 36+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-01-06 11:49 [PATCH v5 00/12] Retpoline: Avoid speculative indirect calls in kernel David Woodhouse
2018-01-06 11:49 ` [PATCH v5 01/12] x86/spectre: Add X86_BUG_SPECTRE_V[12] David Woodhouse
2018-01-06 21:05 ` [tip:x86/pti] x86/cpufeatures: " tip-bot for David Woodhouse
2018-01-06 11:49 ` [PATCH v5 02/12] x86/retpoline: Add initial retpoline support David Woodhouse
2018-01-06 17:32 ` David Woodhouse
2018-01-06 18:05 ` [PATCH v5.1 " David Woodhouse
2018-01-06 18:35 ` [PATCH v5 " Eric Biggers
2018-01-06 19:17 ` David Woodhouse
2018-01-06 21:16 ` Andrew Cooper
2018-01-06 21:21 ` Woodhouse, David
2018-01-07 1:44 ` Tom Lendacky
2018-01-06 21:23 ` Thomas Gleixner
2018-01-06 21:34 ` Andrew Cooper
2018-01-06 21:49 ` Woodhouse, David
2018-01-06 11:49 ` [PATCH v5 03/12] x86/retpoline/crypto: Convert crypto assembler indirect jumps David Woodhouse
2018-01-06 11:49 ` [PATCH v5 04/12] x86/retpoline/entry: Convert entry " David Woodhouse
2018-01-06 11:49 ` [PATCH v5 05/12] x86/retpoline/ftrace: Convert ftrace " David Woodhouse
2018-01-06 18:13 ` Linus Torvalds
2018-01-06 19:53 ` Thomas Gleixner
2018-01-07 1:27 ` Linus Torvalds
2018-01-06 11:49 ` [PATCH v5 06/12] x86/retpoline/hyperv: Convert " David Woodhouse
2018-01-06 11:49 ` [PATCH v5 07/12] x86/retpoline/xen: Convert Xen hypercall " David Woodhouse
2018-01-06 11:49 ` [PATCH v5 08/12] x86/retpoline/checksum32: Convert assembler " David Woodhouse
2018-01-06 11:49 ` [PATCH v5 09/12] x86/retpoline/irq32: " David Woodhouse
2018-01-06 11:49 ` [PATCH v5 10/12] x86/retpoline: Add boot time option to disable retpoline David Woodhouse
2018-01-06 11:49 ` David Woodhouse [this message]
2018-01-06 11:49 ` [PATCH v5 12/12] retpoline/modpost: Quieten MODVERSION retpoline build David Woodhouse
2018-01-07 0:10 ` [RFC PATCH 13/12] Retpoline vs. CONFIG_TRIM_UNUSED_SYMBOLS David Woodhouse
2018-01-07 8:03 ` David Woodhouse
2018-01-07 15:09 ` Lu, Hongjiu
2018-01-07 17:32 ` David Woodhouse
2018-01-07 17:57 ` Lu, Hongjiu
2018-01-07 18:18 ` Thomas Gleixner
2018-01-07 18:32 ` Lu, Hongjiu
2018-01-07 20:57 ` David Woodhouse
2018-01-07 22:16 ` David Woodhouse
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