17 Dec, 2020
2 commits
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With CONFIG_LTO_CLANG, clang generates LLVM IR instead of ELF object
files. As empty.o is used for probing target properties, disable LTO
for it to produce an object file instead.Bug: 145210207
Change-Id: I8fa54c4c9b71f5d481a364b6eb10a4c34b2b71b7
Link: https://lore.kernel.org/lkml/20201211184633.3213045-12-samitolvanen@google.com/
Signed-off-by: Sami Tolvanen
Reviewed-by: Kees Cook -
With LTO, everything is compiled into LLVM bitcode, so we have to link
each module into native code before modpost. Kbuild uses the .lto.o
suffix for these files, which also ends up in module information. This
change strips the unnecessary .lto suffix from the module name.Bug: 145210207
Change-Id: I25b97a586f273b1b8d1f153b71e567136b0016ec
Link: https://lore.kernel.org/lkml/20201211184633.3213045-11-samitolvanen@google.com/
Suggested-by: Bill Wendling
Signed-off-by: Sami Tolvanen
Reviewed-by: Kees Cook
27 Nov, 2020
2 commits
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In the context of GKI we are exporting quite a few internal kernel
symbols, some of which may be static functions (yes this is bad, but
technically it works). As such, we need to be careful about conflicts
and we really should not allow a symbol to be exported more than once.To ensure this is the case, turn the modpost check 'fatal' to bail out
immediately when such a situation is detected.Bug: 174214891
Signed-off-by: Quentin Perret
Change-Id: I674c9c9c327849503e94d79654e6288411a830af -
Using EXPORT_SYMBOL*() on static functions is fundamentally wrong.
Modpost currently reports that as a warning, but clearly this is not a
pattern we should allow, and all in-tree occurences should have been
fixed by now. So, promote the warn() message to fatal() to make sure
this never happens again.Bug: 174214891
Link: https://lore.kernel.org/lkml/20201124182420.2202514-1-qperret@google.com/
Signed-off-by: Quentin Perret
Change-Id: Ic1382bfa24db556161cf1a184a4d44724d7849a1
26 Oct, 2020
1 commit
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Use a more generic form for __section that requires quotes to avoid
complications with clang and gcc differences.Remove the quote operator # from compiler_attributes.h __section macro.
Convert all unquoted __section(foo) uses to quoted __section("foo").
Also convert __attribute__((section("foo"))) uses to __section("foo")
even if the __attribute__ has multiple list entry forms.Conversion done using the script at:
https://lore.kernel.org/lkml/75393e5ddc272dc7403de74d645e6c6e0f4e70eb.camel@perches.com/2-convert_section.pl
Signed-off-by: Joe Perches
Reviewed-by: Nick Desaulniers
Reviewed-by: Miguel Ojeda
Signed-off-by: Linus Torvalds
10 Aug, 2020
2 commits
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Pull Kbuild updates from Masahiro Yamada:
- run the checker (e.g. sparse) after the compiler
- remove unneeded cc-option tests for old compiler flags
- fix tar-pkg to install dtbs
- introduce ccflags-remove-y and asflags-remove-y syntax
- allow to trace functions in sub-directories of lib/
- introduce hostprogs-always-y and userprogs-always-y syntax
- various Makefile cleanups
* tag 'kbuild-v5.9' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild:
kbuild: stop filtering out $(GCC_PLUGINS_CFLAGS) from cc-option base
kbuild: include scripts/Makefile.* only when relevant CONFIG is enabled
kbuild: introduce hostprogs-always-y and userprogs-always-y
kbuild: sort hostprogs before passing it to ifneq
kbuild: move host .so build rules to scripts/gcc-plugins/Makefile
kbuild: Replace HTTP links with HTTPS ones
kbuild: trace functions in subdirectories of lib/
kbuild: introduce ccflags-remove-y and asflags-remove-y
kbuild: do not export LDFLAGS_vmlinux
kbuild: always create directories of targets
powerpc/boot: add DTB to 'targets'
kbuild: buildtar: add dtbs support
kbuild: remove cc-option test of -ffreestanding
kbuild: remove cc-option test of -fno-stack-protector
Revert "kbuild: Create directory for target DTB"
kbuild: run the checker after the compiler -
To build host programs, you need to add the program names to 'hostprogs'
to use the necessary build rule, but it is not enough to build them
because there is no dependency.There are two types of host programs: built as the prerequisite of
another (e.g. gen_crc32table in lib/Makefile), or always built when
Kbuild visits the Makefile (e.g. genksyms in scripts/genksyms/Makefile).The latter is typical in Makefiles under scripts/, which contains host
programs globally used during the kernel build. To build them, you need
to add them to both 'hostprogs' and 'always-y'.This commit adds hostprogs-always-y as a shorthand.
The same applies to user programs. net/bpfilter/Makefile builds
bpfilter_umh on demand, hence always-y is unneeded. In contrast,
programs under samples/ are added to both 'userprogs' and 'always-y'
so they are always built when Kbuild visits the Makefiles.userprogs-always-y works as a shorthand.
Signed-off-by: Masahiro Yamada
Acked-by: Miguel Ojeda
06 Aug, 2020
1 commit
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Pull char/misc driver updates from Greg KH:
"Here is the large set of char and misc and other driver subsystem
patches for 5.9-rc1. Lots of new driver submissions in here, and
cleanups and features for existing drivers.Highlights are:
- habanalabs driver updates
- coresight driver updates
- nvmem driver updates
- huge number of "W=1" build warning cleanups from Lee Jones
- dyndbg updates
- virtbox driver fixes and updates
- soundwire driver updates
- mei driver updates
- phy driver updates
- fpga driver updates
- lots of smaller individual misc/char driver cleanups and fixesFull details are in the shortlog.
All of these have been in linux-next with no reported issues"
* tag 'char-misc-5.9-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (322 commits)
habanalabs: remove unused but set variable 'ctx_asid'
nvmem: qcom-spmi-sdam: Enable multiple devices
dt-bindings: nvmem: SID: add binding for A100's SID controller
nvmem: update Kconfig description
nvmem: qfprom: Add fuse blowing support
dt-bindings: nvmem: Add properties needed for blowing fuses
dt-bindings: nvmem: qfprom: Convert to yaml
nvmem: qfprom: use NVMEM_DEVID_AUTO for multiple instances
nvmem: core: add support to auto devid
nvmem: core: Add nvmem_cell_read_u8()
nvmem: core: Grammar fixes for help text
nvmem: sc27xx: add sc2730 efuse support
nvmem: Enforce nvmem stride in the sysfs interface
MAINTAINERS: Add git tree for NVMEM FRAMEWORK
nvmem: sprd: Fix return value of sprd_efuse_probe()
drivers: android: Fix the SPDX comment style
drivers: android: Fix a variable declaration coding style issue
drivers: android: Remove braces for a single statement if-else block
drivers: android: Remove the use of else after return
drivers: android: Fix a variable declaration coding style issue
...
27 Jul, 2020
2 commits
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This should resolve the merge/build issues reported when trying to
create linux-next.Reported-by: Stephen Rothwell
Signed-off-by: Greg Kroah-Hartman -
Mention why we open-code strsep, so it is clear that it is intentional.
Fixes: 736bb11898ef ("modpost: remove use of non-standard strsep() in HOSTCC code")
Signed-off-by: Wolfram Sang
Signed-off-by: Masahiro Yamada
07 Jul, 2020
1 commit
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strsep() is neither standard C nor POSIX and used outside
the kernel code here. Using it here requires that the
build host supports it out of the box which is e.g.
not true for a Darwin build host and using a cross-compiler.
This leads to:scripts/mod/modpost.c:145:2: warning: implicit declaration of function 'strsep' [-Wimplicit-function-declaration]
return strsep(stringp, "\n");
^and a segfault when running MODPOST.
See also: https://stackoverflow.com/a/7219504
So let's replace this by strchr() instead of using strsep().
It does not hurt kernel size or speed since this code is run
on the build host.Fixes: ac5100f5432967 ("modpost: add read_text_file() and get_line() helpers")
Co-developed-by: Masahiro Yamada
Signed-off-by: H. Nikolaus Schaller
Signed-off-by: Masahiro Yamada
30 Jun, 2020
1 commit
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The SoundWire 1.2 specification adds new capabilities that were not
present in previous version, such as the class ID.To enable support for class drivers, and well as drivers that address
a specific version, all fields of the sdw_device_id structure need to
be exposed. For SoundWire 1.0 and 1.1 devices, a wildcard is used so
class and version information are ignored.Signed-off-by: Pierre-Louis Bossart
Reviewed-by: Rander Wang
Reviewed-by: Guennadi Liakhovetski
Signed-off-by: Bard Liao
Link: https://lore.kernel.org/r/20200608205436.2402-4-yung-chuan.liao@linux.intel.com
Signed-off-by: Vinod Koul
07 Jun, 2020
2 commits
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Pull Kbuild updates from Masahiro Yamada:
- fix warnings in 'make clean' for ARCH=um, hexagon, h8300, unicore32
- ensure to rebuild all objects when the compiler is upgraded
- exclude system headers from dependency tracking and fixdep processing
- fix potential bit-size mismatch between the kernel and BPF user-mode
helper- add the new syntax 'userprogs' to build user-space programs for the
target architecture (the same arch as the kernel)- compile user-space sample code under samples/ for the target arch
instead of the host arch- make headers_install fail if a CONFIG option is leaked to user-space
- sanitize the output format of scripts/checkstack.pl
- handle ARM 'push' instruction in scripts/checkstack.pl
- error out before modpost if a module name conflict is found
- error out when multiple directories are passed to M= because this
feature is broken for a long time- add CONFIG_DEBUG_INFO_COMPRESSED to support compressed debug info
- a lot of cleanups of modpost
- dump vmlinux symbols out into vmlinux.symvers, and reuse it in the
second pass of modpost- do not run the second pass of modpost if nothing in modules is
updated- install modules.builtin(.modinfo) by 'make install' as well as by
'make modules_install' because it is useful even when
CONFIG_MODULES=n- add new command line variables, GZIP, BZIP2, LZOP, LZMA, LZ4, and XZ
to allow users to use alternatives such as pigz, pbzip2, etc.* tag 'kbuild-v5.8' of git://git.kernel.org/pub/scm/linux/kernel/git/masahiroy/linux-kbuild: (96 commits)
kbuild: add variables for compression tools
Makefile: install modules.builtin even if CONFIG_MODULES=n
mksysmap: Fix the mismatch of '.L' symbols in System.map
kbuild: doc: rename LDFLAGS to KBUILD_LDFLAGS
modpost: change elf_info->size to size_t
modpost: remove is_vmlinux() helper
modpost: strip .o from modname before calling new_module()
modpost: set have_vmlinux in new_module()
modpost: remove mod->skip struct member
modpost: add mod->is_vmlinux struct member
modpost: remove is_vmlinux() call in check_for_{gpl_usage,unused}()
modpost: remove mod->is_dot_o struct member
modpost: move -d option in scripts/Makefile.modpost
modpost: remove -s option
modpost: remove get_next_text() and make {grab,release_}file static
modpost: use read_text_file() and get_line() for reading text files
modpost: avoid false-positive file open error
modpost: fix potential mmap'ed file overrun in get_src_version()
modpost: add read_text_file() and get_line() helpers
modpost: do not call get_modinfo() for vmlinux(.o)
... -
Pull dmi update from Jean Delvare.
* 'dmi-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jdelvare/staging:
firmware/dmi: Report DMI Bios & EC firmware release
06 Jun, 2020
23 commits
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Align with the mmap / munmap APIs.
Signed-off-by: Masahiro Yamada
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Now that is_vmlinux() is called only in new_module(), we can inline
the function call.modname is the basename with '.o' is stripped. No need to compare it
with 'vmlinux.o'.vmlinux is always located at the current working directory. No need
to strip the directory path.Signed-off-by: Masahiro Yamada
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new_module() conditionally strips the .o because the modname has .o
suffix when it is called from read_symbols(), but no .o when it is
called from read_dump().It is clearer to strip .o in read_symbols().
I also used flexible-array for mod->name.
Signed-off-by: Masahiro Yamada
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Set have_vmlinux flag in a single place.
Signed-off-by: Masahiro Yamada
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The meaning of 'skip' is obscure since it does not explain
"what to skip".mod->skip is set when it is vmlinux or the module info came from
a dump file.So, mod->skip is equivalent to (mod->is_vmlinux || mod->from_dump).
For the check in write_namespace_deps_files(), mod->is_vmlinux is
unneeded because the -d option is not passed in the first pass of
modpost.Signed-off-by: Masahiro Yamada
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is_vmlinux() is called in several places to check whether the current
module is vmlinux or not.It is faster and clearer to check mod->is_vmlinux flag.
Signed-off-by: Masahiro Yamada
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check_exports() is never called for vmlinux because mod->skip is set
for vmlinux.Hence, check_for_gpl_usage() and check_for_unused() are not called
for vmlinux, either. is_vmlinux() is always false here.Remove the is_vmlinux() calls, and hard-code the ".ko" suffix.
Signed-off-by: Masahiro Yamada
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Previously, there were two cases where mod->is_dot_o is unset:
[1] the executable 'vmlinux' in the second pass of modpost
[2] modules loaded by read_dump()I think [1] was intended usage to distinguish 'vmlinux.o' and 'vmlinux'.
Now that modpost does not parse the executable 'vmlinux', this case
does not happen.[2] is obscure, maybe a bug. Module.symver stores module paths without
extension. So, none of modules loaded by read_dump() has the .o suffix,
and new_module() unsets ->is_dot_o. Anyway, it is not a big deal because
handle_symbol() is not called for the case.To sum up, all the parsed ELF files are .o files.
mod->is_dot_o is unneeded.
Signed-off-by: Masahiro Yamada
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The -s option was added by commit 8d8d8289df65 ("kbuild: do not do
section mismatch checks on vmlinux in 2nd pass").Now that the second pass does not parse vmlinux, this option is
unneeded.Signed-off-by: Masahiro Yamada
-
get_next_line() is no longer used. Remove.
grab_file() and release_file() are only used in modpost.c. Make them
static.Signed-off-by: Masahiro Yamada
-
grab_file() mmaps a file, but it is not so efficient here because
get_next_line() copies every line to the temporary buffer anyway.read_text_file() and get_line() are simpler. get_line() exploits the
library function strchr().Going forward, the missing *.symvers or *.cmd is a fatal error.
This should not happen because scripts/Makefile.modpost guards the
-i option files with $(wildcard $(input-symdump)).Signed-off-by: Masahiro Yamada
-
One problem of grab_file() is that it cannot distinguish the following
two cases:- It cannot read the file (the file does not exist, or read permission
is not set)- It can read the file, but the file size is zero
This is because grab_file() calls mmap(), which requires the mapped
length is greater than 0. Hence, grab_file() fails for both cases.If an empty header file were included for checksum calculation, the
following warning would be printed:WARNING: modpost: could not open ...: Invalid argument
An empty file is a valid source file, so it should not fail.
Use read_text_file() instead. It can read a zero-length file.
Then, parse_file() will succeed with doing nothing.Going forward, the first case (it cannot read the file) is a fatal
error. If the source file from which an object was compiled is missing,
something went wrong.Signed-off-by: Masahiro Yamada
-
I do not know how reliably this function works, but it looks dangerous
to me.strchr(sources, '\n');
... continues searching until it finds '\n' or it reaches the '\0'
terminator. In other words, 'sources' should be a null-terminated
string.However, grab_file() just mmaps a file, so 'sources' is not terminated
with null byte. If the file does not contain '\n' at all, strchr() will
go beyond the mmap'ed memory.Use read_text_file(), which loads the file content into a malloc'ed
buffer, appending null byte.Here we are interested only in the first line of *.mod files. Use
get_line() helper to get the first line.This also makes missing *.mod file a fatal error.
Commit 4be40e22233c ("kbuild: do not emit src version warning for
non-modules") ignored missing *.mod files.I do not fully understand what that commit addressed, but commit
91341d4b2c19 ("kbuild: introduce new option to enhance section mismatch
analysis") introduced partial section checks by using modpost. built-in.o
was parsed by modpost. Even modules had a problem because *.mod files
were created after the modpost check.Commit b7dca6dd1e59 ("kbuild: create *.mod with full directory path and
remove MODVERDIR") stopped doing that. Now that modpost is only invoked
after the directory descend, *.mod files should always exist at the
modpost stage.Signed-off-by: Masahiro Yamada
-
modpost uses grab_file() to open a file, but it is not suitable for
a text file because the mmap'ed file is not terminated by null byte.
Actually, I see some issues for the use of grab_file().The new helper, read_text_file() loads the whole file content into a
malloc'ed buffer, and appends a null byte. Then, get_line() reads
each line.To handle text files, I intend to replace as follows:
grab_file() -> read_text_file()
get_new_line() -> get_line()Signed-off-by: Masahiro Yamada
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The three calls of get_modinfo() ("license", "import_ns", "version")
always return NULL for vmlinux(.o) because the built-in module info is
prefixed with __MODULE_INFO_PREFIX.It is harmless to call get_modinfo(), but there is no point to search
for what apparently does not exist.Signed-off-by: Masahiro Yamada
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As far as I understood, this code gets rid of '$Revision$' or '$Revision:'
of CVS, RCS or whatever in MODULE_VERSION() tags.Remove the primeval code.
Signed-off-by: Masahiro Yamada
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check_exports() does not print warnings about unresolved symbols if
vmlinux is missing because there would be too many.This situation happens when you do 'make modules' from the clean
tree, or compile external modules against a kernel tree that has
not been completely built.It is dangerous to not check unresolved symbols because you might be
building useless modules. At least it should be warned.Signed-off-by: Masahiro Yamada
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Currently, the second pass of modpost is always invoked when you run
'make' or 'make modules' even if none of modules is changed.Use if_changed to invoke it only when it is necessary.
Signed-off-by: Masahiro Yamada
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Previously, the -i option had two functions; load a symbol dump file,
and set the external_module flag.I want to assign a dedicate option for each of them.
Going forward, the -i is used to load a symbol dump file, and the -e
to set the external_module flag.With this, we will be able to use -i for loading in-kernel symbols.
Signed-off-by: Masahiro Yamada
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The -i option is used to include Modules.symver as well as files from
$(KBUILD_EXTRA_SYMBOLS).Make the struct and variable names more generic.
Signed-off-by: Masahiro Yamada
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Now that there is no difference between -i and -e, they can be unified.
Make modpost accept the -i option multiple times, then remove -e.
I will reuse -e for a different purpose.
Signed-off-by: Masahiro Yamada
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The meaning of sym->kernel is obscure; it is set for in-kernel symbols
loaded from Modules.symvers. This happens only when we are building
external modules, and it is used to determine whether to dump symbols
to $(KBUILD_EXTMOD)/Modules.symversIt is clearer to remember whether the symbol or module came from a dump
file or ELF object.This changes the KBUILD_EXTRA_SYMBOLS behavior. Previously, symbols
loaded from KBUILD_EXTRA_SYMBOLS are accumulated into the current
$(KBUILD_EXTMOD)/Modules.symversGoing forward, they will be only used to check symbol references, but
not dumped into the current $(KBUILD_EXTMOD)/Modules.symvers. I believe
this makes more sense.sym->vmlinux will have no user. Remove it too.
Signed-off-by: Masahiro Yamada
-
Some vendors like HPe or Dell, encode the release version of their BIOS
in the "System BIOS {Major|Minor} Release" fields of Type 0.This information is used to know which bios release actually runs.
It could be used for some quirks, debugging sessions or inventory tasks.A typical output for a Dell system running the 65.27 bios is :
[root@t1700 ~]# cat /sys/devices/virtual/dmi/id/bios_release
65.27
[root@t1700 ~]#Servers that have a BMC encode the release version of their firmware in the
"Embedded Controller Firmware {Major|Minor} Release" fields of Type 0.This information is used to know which BMC release actually runs.
It could be used for some quirks, debugging sessions or inventory tasks.A typical output for a Dell system running the 3.75 bmc release is :
[root@t1700 ~]# cat /sys/devices/virtual/dmi/id/ec_firmware_release
3.75
[root@t1700 ~]#Signed-off-by: Erwan Velu
Signed-off-by: Jean Delvare
04 Jun, 2020
1 commit
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Pull networking updates from David Miller:
1) Allow setting bluetooth L2CAP modes via socket option, from Luiz
Augusto von Dentz.2) Add GSO partial support to igc, from Sasha Neftin.
3) Several cleanups and improvements to r8169 from Heiner Kallweit.
4) Add IF_OPER_TESTING link state and use it when ethtool triggers a
device self-test. From Andrew Lunn.5) Start moving away from custom driver versions, use the globally
defined kernel version instead, from Leon Romanovsky.6) Support GRO vis gro_cells in DSA layer, from Alexander Lobakin.
7) Allow hard IRQ deferral during NAPI, from Eric Dumazet.
8) Add sriov and vf support to hinic, from Luo bin.
9) Support Media Redundancy Protocol (MRP) in the bridging code, from
Horatiu Vultur.10) Support netmap in the nft_nat code, from Pablo Neira Ayuso.
11) Allow UDPv6 encapsulation of ESP in the ipsec code, from Sabrina
Dubroca. Also add ipv6 support for espintcp.12) Lots of ReST conversions of the networking documentation, from Mauro
Carvalho Chehab.13) Support configuration of ethtool rxnfc flows in bcmgenet driver,
from Doug Berger.14) Allow to dump cgroup id and filter by it in inet_diag code, from
Dmitry Yakunin.15) Add infrastructure to export netlink attribute policies to
userspace, from Johannes Berg.16) Several optimizations to sch_fq scheduler, from Eric Dumazet.
17) Fallback to the default qdisc if qdisc init fails because otherwise
a packet scheduler init failure will make a device inoperative. From
Jesper Dangaard Brouer.18) Several RISCV bpf jit optimizations, from Luke Nelson.
19) Correct the return type of the ->ndo_start_xmit() method in several
drivers, it's netdev_tx_t but many drivers were using
'int'. From Yunjian Wang.20) Add an ethtool interface for PHY master/slave config, from Oleksij
Rempel.21) Add BPF iterators, from Yonghang Song.
22) Add cable test infrastructure, including ethool interfaces, from
Andrew Lunn. Marvell PHY driver is the first to support this
facility.23) Remove zero-length arrays all over, from Gustavo A. R. Silva.
24) Calculate and maintain an explicit frame size in XDP, from Jesper
Dangaard Brouer.25) Add CAP_BPF, from Alexei Starovoitov.
26) Support terse dumps in the packet scheduler, from Vlad Buslov.
27) Support XDP_TX bulking in dpaa2 driver, from Ioana Ciornei.
28) Add devm_register_netdev(), from Bartosz Golaszewski.
29) Minimize qdisc resets, from Cong Wang.
30) Get rid of kernel_getsockopt and kernel_setsockopt in order to
eliminate set_fs/get_fs calls. From Christoph Hellwig.* git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next: (2517 commits)
selftests: net: ip_defrag: ignore EPERM
net_failover: fixed rollback in net_failover_open()
Revert "tipc: Fix potential tipc_aead refcnt leak in tipc_crypto_rcv"
Revert "tipc: Fix potential tipc_node refcnt leak in tipc_rcv"
vmxnet3: allow rx flow hash ops only when rss is enabled
hinic: add set_channels ethtool_ops support
selftests/bpf: Add a default $(CXX) value
tools/bpf: Don't use $(COMPILE.c)
bpf, selftests: Use bpf_probe_read_kernel
s390/bpf: Use bcr 0,%0 as tail call nop filler
s390/bpf: Maintain 8-byte stack alignment
selftests/bpf: Fix verifier test
selftests/bpf: Fix sample_cnt shared between two threads
bpf, selftests: Adapt cls_redirect to call csum_level helper
bpf: Add csum_level helper for fixing up csum levels
bpf: Fix up bpf_skb_adjust_room helper's skb csum setting
sfc: add missing annotation for efx_ef10_try_update_nic_stats_vf()
crypto/chtls: IPv6 support for inline TLS
Crypto/chcr: Fixes a coccinile check error
Crypto/chcr: Fixes compilations warnings
...
03 Jun, 2020
1 commit
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Currently, modpost reads extra symbol dump files in the reverse order.
If '-e foo -e bar' is given, modpost reads bar, foo, in this order.This is probably not a big deal, but there is no good reason to reverse
the order. Read files in the given order.Signed-off-by: Masahiro Yamada
29 May, 2020
1 commit
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Use sym_get_data_by_offset() helper to get access to the .shstrtab
section data. No functional change is intended because
elf->sechdrs[elf->secindex_strings].sh_addr is 0 for both ET_REL
and ET_EXEC object types.Signed-off-by: Masahiro Yamada