* [PATCH] objtool: Skip unreachable warnings for GCC 4.4 and older
@ 2017-09-27 22:34 Josh Poimboeuf
2017-09-28 5:31 ` [tip:core/urgent] " tip-bot for Josh Poimboeuf
0 siblings, 1 reply; 2+ messages in thread
From: Josh Poimboeuf @ 2017-09-27 22:34 UTC (permalink / raw)
To: Ingo Molnar; +Cc: linux-kernel
The kbuild bot occasionally reports warnings like:
drivers/scsi/pcmcia/aha152x_core.o: warning: objtool: seldo_run()+0x130: unreachable instruction
These warnings are always with GCC 4.4. That version of GCC sometimes
places unreachable instructions after calls to noreturn functions.
The unreachable warnings aren't very important anyway. Just ignore them
for old versions of GCC.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
---
scripts/Makefile.build | 2 ++
1 file changed, 2 insertions(+)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 2e3a10e79ca9..061d0c3a420a 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -265,6 +265,8 @@ objtool_args += --no-fp
endif
ifdef CONFIG_GCOV_KERNEL
objtool_args += --no-unreachable
+else
+objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable)
endif
# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
--
2.13.5
^ permalink raw reply related [flat|nested] 2+ messages in thread
* [tip:core/urgent] objtool: Skip unreachable warnings for GCC 4.4 and older
2017-09-27 22:34 [PATCH] objtool: Skip unreachable warnings for GCC 4.4 and older Josh Poimboeuf
@ 2017-09-28 5:31 ` tip-bot for Josh Poimboeuf
0 siblings, 0 replies; 2+ messages in thread
From: tip-bot for Josh Poimboeuf @ 2017-09-28 5:31 UTC (permalink / raw)
To: linux-tip-commits
Cc: tglx, jpoimboe, linux-kernel, hpa, peterz, fengguang.wu, torvalds, mingo
Commit-ID: da541b20021c781f8b65492eeaee824e729599eb
Gitweb: https://git.kernel.org/tip/da541b20021c781f8b65492eeaee824e729599eb
Author: Josh Poimboeuf <jpoimboe@redhat.com>
AuthorDate: Wed, 27 Sep 2017 17:34:23 -0500
Committer: Ingo Molnar <mingo@kernel.org>
CommitDate: Thu, 28 Sep 2017 07:23:02 +0200
objtool: Skip unreachable warnings for GCC 4.4 and older
The kbuild bot occasionally reports warnings like:
drivers/scsi/pcmcia/aha152x_core.o: warning: objtool: seldo_run()+0x130: unreachable instruction
These warnings are always with GCC 4.4. That version of GCC sometimes
places unreachable instructions after calls to noreturn functions.
The unreachable warnings aren't very important anyway. Just ignore them
for old versions of GCC.
Reported-by: kbuild test robot <fengguang.wu@intel.com>
Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/bc89b807d965b98ec18a0bb94f96a594bd58f2f2.1506551639.git.jpoimboe@redhat.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
---
scripts/Makefile.build | 2 ++
1 file changed, 2 insertions(+)
diff --git a/scripts/Makefile.build b/scripts/Makefile.build
index 2e3a10e7..061d0c3 100644
--- a/scripts/Makefile.build
+++ b/scripts/Makefile.build
@@ -265,6 +265,8 @@ objtool_args += --no-fp
endif
ifdef CONFIG_GCOV_KERNEL
objtool_args += --no-unreachable
+else
+objtool_args += $(call cc-ifversion, -lt, 0405, --no-unreachable)
endif
# 'OBJECT_FILES_NON_STANDARD := y': skip objtool checking for a directory
^ permalink raw reply related [flat|nested] 2+ messages in thread
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2017-09-27 22:34 [PATCH] objtool: Skip unreachable warnings for GCC 4.4 and older Josh Poimboeuf
2017-09-28 5:31 ` [tip:core/urgent] " tip-bot for Josh Poimboeuf
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