Re: linux-next: build warnings after merge of the kbuild tree

From: Masahiro Yamada
Date: Thu May 31 2018 - 21:56:57 EST

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2018-05-31 12:53 GMT+09:00 Kees Cook <keescook@xxxxxxxxxxxx>:
> On Wed, May 30, 2018 at 6:26 PM, Kees Cook <keescook@xxxxxxxxxxxx> wrote:
>> On Wed, May 30, 2018 at 6:12 PM, Masahiro Yamada
>> <yamada.masahiro@xxxxxxxxxxxxx> wrote:
>>> Hi.
>>> (+CC Kees)
>>>
>>> 2018-05-31 7:40 GMT+09:00 Stephen Rothwell <sfr@xxxxxxxxxxxxxxxx>:
>>>> Hi Masahiro,
>>>>
>>>> After merging the kbuild tree, today's linux-next build (x86_64
>>>> allmodconfig) produced these warnings:
>>>>
>>>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c: In function 'wlc_phy_workarounds_nphy_rev7':
>>>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:16563:1: warning: the frame size of 3136 bytes is larger than 2048 bytes [-Wframe-larger-than=]
>>>> }
>>>> ^
>>>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c: In function 'wlc_phy_workarounds_nphy_rev3':
>>>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:16905:1: warning: the frame size of 2872 bytes is larger than 2048 bytes [-Wframe-larger-than=]
>>>> }
>>>> ^
>>>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c: In function 'wlc_phy_cal_txiqlo_nphy':
>>>> drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:26033:1: warning: the frame size of 2432 bytes is larger than 2048 bytes [-Wframe-larger-than=]
>>>> }
>>>> ^
>>>>
>>>> I have no idea what caused these warnings to appear ... nothing in those
>>>> functions looks too bad.
>>>
>>>
>>> This has been triggered by the following commit:
>>>
>>>
>>> commit 0e461945f3504e09b8ecf947b6398adce1287a28
>>> Author: Masahiro Yamada <yamada.masahiro@xxxxxxxxxxxxx>
>>> Date: Mon May 28 18:22:07 2018 +0900
>>>
>>> gcc-plugins: allow to enable GCC_PLUGINS for COMPILE_TEST
>>>
>>>
>>>
>>> CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL was previously disabled
>>> for COMPILE_TEST, which is now enabled.
>>
>> Weird -- I do build tests with plugins enabled pretty regularly. I
>> hadn't seen this before. I'll see if I can figure out what the
>> combination is...
>
> Weirdly, I only see this after merging kbuild/for-next into
> next-20180530. (I don't get the warning if I just force the plugins
> on.)

I see this warning on Linus' tree as well
if the plugins are enabled.

Just remove "depends on !COMPILE_TEST", and try allmodconfig.

masahiro@grover:~/ref/linux$ git show --pretty=short
commit 0512e0134582ef85dee77d51aae77dcd1edec495
Merge: dd52cb8 829bc787
Author: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>

Merge tag 'xfs-4.17-fixes-3' of
git://git.kernel.org/pub/scm/fs/xfs/xfs-linux

masahiro@grover:~/ref/linux$ git diff
diff --git a/arch/Kconfig b/arch/Kconfig
index 75dd23a..7d44cfe 100644
--- a/arch/Kconfig
+++ b/arch/Kconfig
@@ -410,7 +410,6 @@ config HAVE_GCC_PLUGINS
menuconfig GCC_PLUGINS
bool "GCC plugins"
depends on HAVE_GCC_PLUGINS
- depends on !COMPILE_TEST
help
GCC plugins are loadable modules that provide extra features to the
compiler. They are useful for runtime instrumentation and
static analysis.
masahiro@grover:~/ref/linux$ make allmodconfig
HOSTCC scripts/basic/fixdep
HOSTCC scripts/kconfig/conf.o
YACC scripts/kconfig/zconf.tab.c
LEX scripts/kconfig/zconf.lex.c
HOSTCC scripts/kconfig/zconf.tab.o
HOSTLD scripts/kconfig/conf
scripts/kconfig/conf --allmodconfig Kconfig
#
# configuration written to .config
#
masahiro@grover:~/ref/linux$ make
drivers/net/wireless/broadcom/brcm80211/brcmsmac/
scripts/kconfig/conf --syncconfig Kconfig
SYSTBL arch/x86/include/generated/asm/syscalls_32.h
SYSHDR arch/x86/include/generated/asm/unistd_32_ia32.h
SYSHDR arch/x86/include/generated/asm/unistd_64_x32.h
SYSTBL arch/x86/include/generated/asm/syscalls_64.h
HYPERCALLS arch/x86/include/generated/asm/xen-hypercalls.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_32.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_64.h
SYSHDR arch/x86/include/generated/uapi/asm/unistd_x32.h
HOSTCC scripts/basic/bin2c
HOSTCC arch/x86/tools/relocs_32.o
HOSTCC arch/x86/tools/relocs_64.o
HOSTCC arch/x86/tools/relocs_common.o
HOSTLD arch/x86/tools/relocs
CHK include/config/kernel.release
UPD include/config/kernel.release
WRAP arch/x86/include/generated/uapi/asm/bpf_perf_event.h
WRAP arch/x86/include/generated/uapi/asm/poll.h
WRAP arch/x86/include/generated/asm/dma-contiguous.h
WRAP arch/x86/include/generated/asm/early_ioremap.h
WRAP arch/x86/include/generated/asm/mcs_spinlock.h
WRAP arch/x86/include/generated/asm/mm-arch-hooks.h
CHK include/generated/uapi/linux/version.h
UPD include/generated/uapi/linux/version.h
CHK include/generated/utsrelease.h
UPD include/generated/utsrelease.h
CC arch/x86/purgatory/purgatory.o
AS arch/x86/purgatory/stack.o
AS arch/x86/purgatory/setup-x86_64.o
CC arch/x86/purgatory/sha256.o
AS arch/x86/purgatory/entry64.o
CC arch/x86/purgatory/string.o
LD arch/x86/purgatory/purgatory.ro
BIN2C arch/x86/purgatory/kexec-purgatory.c
HOSTCXX -fPIC scripts/gcc-plugins/latent_entropy_plugin.o
HOSTLLD -shared scripts/gcc-plugins/latent_entropy_plugin.so
HOSTCXX -fPIC scripts/gcc-plugins/structleak_plugin.o
HOSTLLD -shared scripts/gcc-plugins/structleak_plugin.so
GENSEED scripts/gcc-plugins/randomize_layout_seed.h
HOSTCXX -fPIC scripts/gcc-plugins/randomize_layout_plugin.o
HOSTLLD -shared scripts/gcc-plugins/randomize_layout_plugin.so
CC kernel/bounds.s
CHK include/generated/bounds.h
UPD include/generated/bounds.h
CHK include/generated/timeconst.h
UPD include/generated/timeconst.h
CC arch/x86/kernel/asm-offsets.s
CHK include/generated/asm-offsets.h
UPD include/generated/asm-offsets.h
CALL scripts/checksyscalls.sh
DESCEND objtool
HOSTCC /home/masahiro/ref/linux/tools/objtool/fixdep.o
HOSTLD /home/masahiro/ref/linux/tools/objtool/fixdep-in.o
LINK /home/masahiro/ref/linux/tools/objtool/fixdep
CC /home/masahiro/ref/linux/tools/objtool/exec-cmd.o
CC /home/masahiro/ref/linux/tools/objtool/help.o
CC /home/masahiro/ref/linux/tools/objtool/pager.o
CC /home/masahiro/ref/linux/tools/objtool/parse-options.o
CC /home/masahiro/ref/linux/tools/objtool/run-command.o
CC /home/masahiro/ref/linux/tools/objtool/sigchain.o
CC /home/masahiro/ref/linux/tools/objtool/subcmd-config.o
LD /home/masahiro/ref/linux/tools/objtool/libsubcmd-in.o
AR /home/masahiro/ref/linux/tools/objtool/libsubcmd.a
CC /home/masahiro/ref/linux/tools/objtool/arch/x86/decode.o
LD /home/masahiro/ref/linux/tools/objtool/arch/x86/objtool-in.o
CC /home/masahiro/ref/linux/tools/objtool/builtin-check.o
CC /home/masahiro/ref/linux/tools/objtool/builtin-orc.o
CC /home/masahiro/ref/linux/tools/objtool/check.o
CC /home/masahiro/ref/linux/tools/objtool/orc_gen.o
CC /home/masahiro/ref/linux/tools/objtool/orc_dump.o
CC /home/masahiro/ref/linux/tools/objtool/elf.o
CC /home/masahiro/ref/linux/tools/objtool/special.o
CC /home/masahiro/ref/linux/tools/objtool/objtool.o
CC /home/masahiro/ref/linux/tools/objtool/libstring.o
CC /home/masahiro/ref/linux/tools/objtool/str_error_r.o
LD /home/masahiro/ref/linux/tools/objtool/objtool-in.o
LINK /home/masahiro/ref/linux/tools/objtool/objtool
HOSTCC scripts/dtc/dtc.o
HOSTCC scripts/dtc/flattree.o
HOSTCC scripts/dtc/fstree.o
HOSTCC scripts/dtc/data.o
HOSTCC scripts/dtc/livetree.o
HOSTCC scripts/dtc/treesource.o
HOSTCC scripts/dtc/srcpos.o
HOSTCC scripts/dtc/checks.o
HOSTCC scripts/dtc/util.o
LEX scripts/dtc/dtc-lexer.lex.c
YACC scripts/dtc/dtc-parser.tab.h
HOSTCC scripts/dtc/dtc-lexer.lex.o
YACC scripts/dtc/dtc-parser.tab.c
HOSTCC scripts/dtc/dtc-parser.tab.o
HOSTLD scripts/dtc/dtc
HOSTCC scripts/genksyms/genksyms.o
YACC scripts/genksyms/parse.tab.c
HOSTCC scripts/genksyms/parse.tab.o
LEX scripts/genksyms/lex.lex.c
YACC scripts/genksyms/parse.tab.h
HOSTCC scripts/genksyms/lex.lex.o
HOSTLD scripts/genksyms/genksyms
CC scripts/mod/empty.o
HOSTCC scripts/mod/mk_elfconfig
MKELF scripts/mod/elfconfig.h
HOSTCC scripts/mod/modpost.o
CC scripts/mod/devicetable-offsets.s
CHK scripts/mod/devicetable-offsets.h
UPD scripts/mod/devicetable-offsets.h
HOSTCC scripts/mod/file2alias.o
HOSTCC scripts/mod/sumversion.o
HOSTLD scripts/mod/modpost
HOSTCC scripts/selinux/genheaders/genheaders
HOSTCC scripts/selinux/mdp/mdp
HOSTCC scripts/kallsyms
HOSTCC scripts/pnmtologo
HOSTCC scripts/conmakehash
HOSTCC scripts/recordmcount
HOSTCC scripts/sortextable
HOSTCC scripts/asn1_compiler
HOSTCC scripts/sign-file
HOSTCC scripts/extract-cert
HOSTCC scripts/insert-sys-cert
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/mac80211_if.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/ucode_loader.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/ampdu.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/antsel.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/channel.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/main.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy_shim.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/pmu.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/rate.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/stf.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/aiutils.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_cmn.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_lcn.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.o
drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c: In
function âwlc_phy_workarounds_nphy_rev7â:
drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:16563:1:
warning: the frame size of 3128 bytes is larger than 2048 bytes
[-Wframe-larger-than=]
}
^
drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c: In
function âwlc_phy_workarounds_nphy_rev3â:
drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:16905:1:
warning: the frame size of 2800 bytes is larger than 2048 bytes
[-Wframe-larger-than=]
}
^
drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c: In
function âwlc_phy_cal_txiqlo_nphyâ:
drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_n.c:26033:1:
warning: the frame size of 2488 bytes is larger than 2048 bytes
[-Wframe-larger-than=]
}
^
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phytbl_lcn.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phytbl_n.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/phy/phy_qmath.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/dma.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcms_trace_events.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/debug.o
CC [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/led.o
LD [M] drivers/net/wireless/broadcom/brcm80211/brcmsmac/brcmsmac.o

> Regardless, I can confirm that CONFIG_GCC_PLUGIN_STRUCTLEAK_BYREF_ALL
> trips it. I'll investigate more tomorrow...
>
> -Kees
>
> --
> Kees Cook
> Pixel Security

--
Best Regards
Masahiro Yamada

Next message: Eric W. Biederman: "[PATCH] memcg: Replace mm->owner with mm->memcg"
Previous message: Stephen Rothwell: "linux-next: manual merge of the vfs tree with the ext3 tree"
In reply to: Kees Cook: "Re: linux-next: build warnings after merge of the kbuild tree"
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