* [PATCH] kbuild: deprecate cc-option-align
@ 2017-06-19 7:28 Masahiro Yamada
2017-06-22 8:59 ` Ingo Molnar
2017-06-25 4:00 ` Masahiro Yamada
0 siblings, 2 replies; 3+ messages in thread
From: Masahiro Yamada @ 2017-06-19 7:28 UTC (permalink / raw)
To: linux-kbuild
Cc: Masahiro Yamada, Matthias Kaehlcke, Marcin Nowakowski,
Arnd Bergmann, Mark Charlebois, Kees Cook, Michal Marek,
linux-kernel, x86, H. Peter Anvin, Jonathan Corbet,
Thomas Gleixner, linux-doc, Josh Poimboeuf, Ingo Molnar,
Emese Revfy
Documentation/kbuild/makefiles.txt says the change for align options
occurred at GCC 3.0, and Documentation/process/changes.rst says the
minimal supported GCC version is 3.2, so it should be safe to hard-code
-falign* options.
Fix the only user arch/x86/Makefile_32.cpu and deprecate the
cc-option-align.
Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
---
x86 maintainers,
If this patch looks OK, could you give me Acked-by?
Documentation/kbuild/makefiles.txt | 16 ----------------
arch/x86/Makefile_32.cpu | 7 +++----
scripts/Kbuild.include | 5 -----
3 files changed, 3 insertions(+), 25 deletions(-)
diff --git a/Documentation/kbuild/makefiles.txt b/Documentation/kbuild/makefiles.txt
index 1c49e87cea4f..247fb331c4b2 100644
--- a/Documentation/kbuild/makefiles.txt
+++ b/Documentation/kbuild/makefiles.txt
@@ -486,22 +486,6 @@ more details, with real examples.
respectively.
Note: cc-option-yn uses KBUILD_CFLAGS for $(CC) options
- cc-option-align
- gcc versions >= 3.0 changed the type of options used to specify
- alignment of functions, loops etc. $(cc-option-align), when used
- as prefix to the align options, will select the right prefix:
- gcc < 3.00
- cc-option-align = -malign
- gcc >= 3.00
- cc-option-align = -falign
-
- Example:
- KBUILD_CFLAGS += $(cc-option-align)-functions=4
-
- In the above example, the option -falign-functions=4 is used for
- gcc >= 3.00. For gcc < 3.00, -malign-functions=4 is used.
- Note: cc-option-align uses KBUILD_CFLAGS for $(CC) options
-
cc-disable-warning
cc-disable-warning checks if gcc supports a given warning and returns
the commandline switch to disable it. This special function is needed,
diff --git a/arch/x86/Makefile_32.cpu b/arch/x86/Makefile_32.cpu
index a45eb15b7cf2..f3717d36718a 100644
--- a/arch/x86/Makefile_32.cpu
+++ b/arch/x86/Makefile_32.cpu
@@ -9,7 +9,6 @@ else
tune = $(call cc-option,-mcpu=$(1),$(2))
endif
-align := $(cc-option-align)
cflags-$(CONFIG_M486) += -march=i486
cflags-$(CONFIG_M586) += -march=i586
cflags-$(CONFIG_M586TSC) += -march=i586
@@ -24,11 +23,11 @@ cflags-$(CONFIG_MK6) += -march=k6
# They make zero difference whatsosever to performance at this time.
cflags-$(CONFIG_MK7) += -march=athlon
cflags-$(CONFIG_MK8) += $(call cc-option,-march=k8,-march=athlon)
-cflags-$(CONFIG_MCRUSOE) += -march=i686 $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
-cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
+cflags-$(CONFIG_MCRUSOE) += -march=i686 -falign-functions=0 -falign-jumps=0 -falign-loops=0
+cflags-$(CONFIG_MEFFICEON) += -march=i686 $(call tune,pentium3) -falign-functions=0 -falign-jumps=0 -falign-loops=0
cflags-$(CONFIG_MWINCHIPC6) += $(call cc-option,-march=winchip-c6,-march=i586)
cflags-$(CONFIG_MWINCHIP3D) += $(call cc-option,-march=winchip2,-march=i586)
-cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) $(align)-functions=0 $(align)-jumps=0 $(align)-loops=0
+cflags-$(CONFIG_MCYRIXIII) += $(call cc-option,-march=c3,-march=i486) -falign-functions=0 -falign-jumps=0 -falign-loops=0
cflags-$(CONFIG_MVIAC3_2) += $(call cc-option,-march=c3-2,-march=i686)
cflags-$(CONFIG_MVIAC7) += -march=i686
cflags-$(CONFIG_MCORE2) += -march=i686 $(call tune,core2)
diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 5001bf9b6579..9a7697d17fb5 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -133,11 +133,6 @@ hostcc-option = $(call __cc-option, $(HOSTCC),\
cc-option-yn = $(call try-run,\
$(CC) -Werror $(KBUILD_CPPFLAGS) $(CC_OPTION_CFLAGS) $(1) -c -x c /dev/null -o "$$TMP",y,n)
-# cc-option-align
-# Prefix align with either -falign or -malign
-cc-option-align = $(subst -functions=0,,\
- $(call cc-option,-falign-functions=0,-malign-functions=0))
-
# cc-disable-warning
# Usage: cflags-y += $(call cc-disable-warning,unused-but-set-variable)
cc-disable-warning = $(call try-run,\
--
2.7.4
^ permalink raw reply related [flat|nested] 3+ messages in thread
* Re: [PATCH] kbuild: deprecate cc-option-align
2017-06-19 7:28 [PATCH] kbuild: deprecate cc-option-align Masahiro Yamada
@ 2017-06-22 8:59 ` Ingo Molnar
2017-06-25 4:00 ` Masahiro Yamada
1 sibling, 0 replies; 3+ messages in thread
From: Ingo Molnar @ 2017-06-22 8:59 UTC (permalink / raw)
To: Masahiro Yamada
Cc: linux-kbuild, Matthias Kaehlcke, Marcin Nowakowski,
Arnd Bergmann, Mark Charlebois, Kees Cook, Michal Marek,
linux-kernel, x86, H. Peter Anvin, Jonathan Corbet,
Thomas Gleixner, linux-doc, Josh Poimboeuf, Ingo Molnar,
Emese Revfy
* Masahiro Yamada <yamada.masahiro@socionext.com> wrote:
> Documentation/kbuild/makefiles.txt says the change for align options
> occurred at GCC 3.0, and Documentation/process/changes.rst says the
> minimal supported GCC version is 3.2, so it should be safe to hard-code
> -falign* options.
>
> Fix the only user arch/x86/Makefile_32.cpu and deprecate the
> cc-option-align.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
> ---
>
> x86 maintainers,
>
> If this patch looks OK, could you give me Acked-by?
LGTM in principle, although I haven't tested it:
Acked-by: Ingo Molnar <mingo@kernel.org>
Thanks,
Ingo
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: [PATCH] kbuild: deprecate cc-option-align
2017-06-19 7:28 [PATCH] kbuild: deprecate cc-option-align Masahiro Yamada
2017-06-22 8:59 ` Ingo Molnar
@ 2017-06-25 4:00 ` Masahiro Yamada
1 sibling, 0 replies; 3+ messages in thread
From: Masahiro Yamada @ 2017-06-25 4:00 UTC (permalink / raw)
To: Linux Kbuild mailing list
Cc: Masahiro Yamada, Matthias Kaehlcke, Marcin Nowakowski,
Arnd Bergmann, Mark Charlebois, Kees Cook, Michal Marek,
Linux Kernel Mailing List, X86 ML, H. Peter Anvin,
Jonathan Corbet, Thomas Gleixner, linux-doc, Josh Poimboeuf,
Ingo Molnar, Emese Revfy
2017-06-19 16:28 GMT+09:00 Masahiro Yamada <yamada.masahiro@socionext.com>:
> Documentation/kbuild/makefiles.txt says the change for align options
> occurred at GCC 3.0, and Documentation/process/changes.rst says the
> minimal supported GCC version is 3.2, so it should be safe to hard-code
> -falign* options.
>
> Fix the only user arch/x86/Makefile_32.cpu and deprecate the
> cc-option-align.
>
> Signed-off-by: Masahiro Yamada <yamada.masahiro@socionext.com>
Applied to linux-kbuild/kbuild.
--
Best Regards
Masahiro Yamada
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2017-06-25 4:00 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2017-06-19 7:28 [PATCH] kbuild: deprecate cc-option-align Masahiro Yamada
2017-06-22 8:59 ` Ingo Molnar
2017-06-25 4:00 ` Masahiro Yamada
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).