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These functions are useful for the EFI app. As a first step towards
making these available outside lib/efi_loader, create a separate header
file and include it where needed. Add proper comments to the functions,
since many are missing at present.
Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
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Sean Edmond <[email protected]> says:
In our datacenter application, a single DHCP server is servicing 36000+ clients.
Improvements are required to the DHCPv4 retransmission behavior to align with
RFC and ensure less pressure is exerted on the server:
- retransmission backoff interval maximum is configurable
(environment variable bootpretransmitperiodmax)
- initial retransmission backoff interval is configurable
(environment variable bootpretransmitperiodinit)
- transaction ID is kept the same for each BOOTP/DHCPv4 request
(not recreated on each retry)
For our application we'll use:
- bootpretransmitperiodmax=16000
- bootpretransmitperiodinit=2000
A new configuration BOOTP_RANDOM_XID has been added to enable a randomized
BOOTP/DHCPv4 transaction ID.
Enhance DHCPv4 sending/parsing option 209 (PXE config file). A previous
patch was accepted. A new patch fixes a possible double free() and
addresses latest review comments.
Link: https://lore.kernel.org/r/[email protected]
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This patch introduces 3 improvements to align with RFC 951:
- retransmission backoff interval maximum is configurable
- initial retranmission backoff interval is configurable
- transaction ID is kept the same for each BOOTP/DHCPv4 request
In applications where thousands of nodes are serviced by a single DHCP
server, maximizing the retransmission backoff interval at 2 seconds (the
current u-boot default) exerts high pressure on the DHCP server and
network layer.
RFC 951 “7.2. Client Retransmission Strategy” states that the
retransmission backoff interval should be limited to 60 seconds. This
patch allows the interval to be configurable using the environment
variable "bootpretransmitperiodmax"
The initial retranmission backoff period defaults to 250ms, which is
also too small for these scenarios with many clients. This patch makes
the initial retransmission interval to be configurable using the
environment variable "bootpretransmitperiodinit".
Also, on a retransmission it is not expected for the transaction ID to
change (only the 'secs' field should be updated). Let's save the
transaction ID and use the same transaction ID for each BOOTP/DHCPv4
exchange.
Signed-off-by: Sean Edmond <[email protected]>
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The formatting with %pa / %pap behaves like %x, which results in an
incorrect value being output. To improve this, a new fine-tuning
Kconfig SPL_USE_TINY_PRINTF_POINTER_SUPPORT for pointer formatting
has been added. If it is enabled, the output of %pa / %pap should
be correct, and if it is disabled, the pointer formatting is
completely unsupported. In addition to indicate unsupported formatting,
'?' will be output. This allows enabling pointer formatting only
when needed. For SPL_NET it is selected by default. Then it also
supports the formatting with %pm, %pM and %pI4.
In summery this level of %p support for tiny printf is possible now:
1) The standard tiny printf won't have support for pointer formatting.
So it doesn't print misleading values for %pa, instead '?' will be
output:
%p => ?
%pa => ?a
%pap => ?ap
2) If SPL_USE_TINY_PRINTF_POINTER_SUPPORT is enabled or DEBUG is defined
tiny printf supports formatting %p and %pa / %pap.
3) If SPL_NET is enabled the support of pointers is extended
for %pm, %pM and %pI4.
Signed-off-by: Christoph Niedermaier <[email protected]>
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Functions called from EFI applications should not do console output.
Refactor the wget code to implement this requirement. The wget_http_info
struct is used to hold the boolean that signifies whether the output is
allowed or not.
Signed-off-by: Jerome Forissier <[email protected]>
Reported-by: Heinrich Schuchardt <[email protected]>
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We don't want ANSI escape-sequences written in tests since it is a pain
to check the output with ut_assert_nextline() et al.
Provide a way to tests to request that these characters not be sent.
Add a proper function comment while we are here, to encourage others.
Signed-off-by: Simon Glass <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
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Linux changed the behaviour of strim() so that a string with only spaces
reduces places the terminator at the start of the string, rather than
returning a pointer to the end of the string.
Bring in this version, from Linux v6.14
Add a comment about the new behaviour.
Signed-off-by: Simon Glass <[email protected]>
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The include file <command.h> does not need anything from <env.h>.
Furthermore, include/env.h itself includes other headers which can lead
to longer indirect inclusion paths. To prepare to remove <env.h> from
<command.h> fix all of the places which had relied on this indirect
inclusion to instead include <env.h> directly.
Signed-off-by: Tom Rini <[email protected]>
---
Cc: Anatolij Gustschin <[email protected]>
Cc: Bin Meng <[email protected]>
Cc: Heinrich Schuchardt <[email protected]>
Cc: Ilias Apalodimas <[email protected]>
Cc: Jaehoon Chung <[email protected]>
Cc: Jerome Forissier <[email protected]>
Cc: Linus Walleij <[email protected]>
Cc: Lukasz Majewski <[email protected]>
Cc: Marek Vasut <[email protected]>
Cc: Mark Kettenis <[email protected]>
Cc: Masahisa Kojima <[email protected]>
Cc: Mattijs Korpershoek <[email protected]>
Cc: Patrice Chotard <[email protected]>
Cc: Patrick Delaunay <[email protected]>
Cc: Rayagonda Kokatanur <[email protected]>
Cc: Simon Glass <[email protected]>
Cc: Simon Goldschmidt <[email protected]>
Cc: Stefan Bosch <[email protected]>
Cc: Tien Fong Chee <[email protected]>
Cc: Tingting Meng <[email protected]>
Cc: Tobias Waldekranz <[email protected]>
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Imitate in dtbdump what initrddump does for color,
newlines and input handling. The output parsing in
the CI is strict and with the current output the CI
is not recongnizing the prompt '=>'.
Signed-off-by: Adriano Cordova <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
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Currently, when decompressing a gzip-compressed image during bootm, a
generic error such as "inflate() returned -5" is shown when the buffer is
too small. However, it is not immediately clear that this is caused by
CONFIG_SYS_BOOTM_LEN being too small.
This patch improves error handling by:
- Detecting Z_BUF_ERROR (-5) returned from the inflate() call
- Suggesting the user to increase CONFIG_SYS_BOOTM_LEN when applicable
- Preserving the original return code from zunzip() instead of overwriting
it with -1
By providing clearer hints when decompression fails due to insufficient
buffer size, this change helps users diagnose and fix boot failures more
easily.
Signed-off-by: Aristo Chen <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>
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Caleb Connolly <[email protected]> says:
Introduce a new event to signal that the live tree has been built,
allowing boards to perform fixups on the tree before devices are bound.
Crucially this allows for devices to be enabled or disabled, but also
allows for properties that are parsed during the bind stage to be
modified (such as dr_mode for dwc3).
With this in place, mach-snapdragon is switched over to use the event
and some hacky U-Boot specific DT overrides (which had to be undone
prior to booting an image) are removed in favour of fixing up the
livetree (which is not passed on to further boot stages).
Finally, some minor fixes are made for the QCM2290 RB1 board, the sdcard
is enabled and it now uses USB host mode in U-Boot like it's bigger
sibling the RB2.
Link: https://lore.kernel.org/r/[email protected]
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OF_LIVE offers a variety of benefits, one of them being that the live
tree can be modified without caring about the underlying FDT. This is
particularly valuable for working around U-Boot limitations like lacking
USB superspeed support on Qualcomm platforms, no runtime OTG, or
peripherals like the sdcard being broken (and displaying potentially
worrying error messages).
Add an event to signal when the live tree has been built so that we can
apply fixups to it directly before devices are bound.
Signed-off-by: Caleb Connolly <[email protected]>
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Support for calculating video damage
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Now that we have a damage tracking API, let's populate damage done by
UEFI payloads when they BLT data onto the screen.
Signed-off-by: Alexander Graf <[email protected]>
Reported-by: Da Xue <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
[Alper: Add struct comment for new member]
Signed-off-by: Alper Nebi Yasak <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
Link: https://lore.kernel.org/u-boot/[email protected]/
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Signed-off-by: Adriano Cordova <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
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Do not try to create an initrd device path nor try to register
an initrd with the EFI_LOAD_FILE2_PROTOCOL if none is provided.
Handle initrd installation in efi_binary_run_dp with
efi_install_initrd, imitating what is done for the fdt.
Fixes: 36835a9105c ("efi_loader: binary_run: register an initrd")
Reported-by: Weizhao Ouyang <[email protected]>
Signed-off-by: Adriano Cordova <[email protected]>
Tested-by: Weizhao Ouyang <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
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This series from Raymond Mao <[email protected]> fixes some cases
of passing the device tree to U-Boot via standard passage and then
ensures that we set the environment variable of the device tree
correctly in this case.
Link: https://lore.kernel.org/r/[email protected]
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When a bloblist is valid and contains fdt, it explicitly means
a previous boot stage is passing transfer list compliant with
Firmware Handoff specification, thus the fdt from bloblist should
not be overridden with the ones from board or env variables.
Fixes: 70fe23859437 ("fdt: Allow the devicetree to come from a bloblist")
Signed-off-by: Raymond Mao <[email protected]>
Reviewed-by: Caleb Connolly <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
Reviewed-by: Simon Glass <[email protected]>
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When starting image add the image load address to the debug output.
Signed-off-by: Heinrich Schuchardt <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
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Without the HII configuration protocol the debug version of the UEFI shell
cannot be used.
Signed-off-by: Heinrich Schuchardt <[email protected]>
Acked-by: Ilias Apalodimas <[email protected]>
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If there is no UCLASS_SYSINFO device available, parent_node will be
ofnode_null(). Calling ofnode_find_subnode() then triggers an assertion:
drivers/core/ofnode.c:598: ofnode_find_subnode: Assertion `ofnode_valid(node)' failed.
Check for a valid parent_node, not just that OF_CONTROL is enabled.
Fixes: 44ffb6f0ecaf ("smbios: Allow properties to come from the device tree")
Signed-off-by: Samuel Holland <[email protected]>
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Jerome Forissier <[email protected]> says:
This series introduces threads and uses them to improve the performance
of the USB bus scanning code and to implement background jobs in the
shell via two new commands: 'spawn' and 'wait'.
The threading framework is called 'uthread' and is inspired from the
barebox threads [2]. setjmp() and longjmp() are used to save and
restore contexts, as well as a non-standard extension called initjmp().
This new function is added in several patches, one for each
architecture that supports HAVE_SETJMP. A new symbol is defined:
HAVE_INITJMP. Two tests, one for initjmp() and one for the uthread
scheduling, are added to the lib suite.
After introducing threads and making schedule() and udelay() a thread
re-scheduling point, the USB stack initialization is modified to benefit
from concurrency when UTHREAD is enabled, where uthreads are used in
usb_init() to initialize and scan multiple busses at the same time.
The code was tested on arm64 and arm QEMU with 4 simulated XHCI buses
and some devices. On this platform the USB scan takes 2.2 s instead of
5.6 s. Tested on i.MX93 EVK with two USB hubs, one ethernet adapter and
one webcam on each, "usb start" takes 2.4 s instead of 4.6 s.
Finally, the spawn and wait commands are introduced, allowing the use of
threads from the shell. Tested on the i.MX93 EVK with a spinning HDD
connected to USB1 and the network connected to ENET1. The USB plus DHCP
init sequence "spawn usb start; spawn dhcp; wait" takes 4.5 seconds
instead of 8 seconds for "usb start; dhcp".
[1] https://patchwork.ozlabs.org/project/uboot/list/?series=446674
[2] https://github.com/barebox/barebox/blob/master/common/bthread.c
Link: https://lore.kernel.org/r/[email protected]
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Introduce a uthread scheduling loop into udelay() when CONFIG_UTHREAD
is enabled. This means that any uthread calling into udelay() may yield
to uthread and be scheduled again later. There is no delay in the
scheduling loop because tests have shown that such a delay can have a
detrimental effect on the console (input drops characters).
Signed-off-by: Jerome Forissier <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
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Add struct uthread_mutex and uthread_mutex_lock(),
uthread_mutex_trylock(), uthread_mutex_unlock() to protect shared data
structures from concurrent modifications.
Signed-off-by: Jerome Forissier <[email protected]>
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Add a new internal API called uthread (Kconfig symbol: UTHREAD) which
provides cooperative multi-tasking. The goal is to be able to improve
the performance of some parts of U-Boot by overlapping lengthy
operations, and also implement background jobs in the U-Boot shell.
Each uthread has its own stack allocated on the heap. The default stack
size is defined by the UTHREAD_STACK_SIZE symbol and is used when
uthread_create() receives zero for the stack_sz argument.
The implementation is based on context-switching via initjmp()/setjmp()/
longjmp() and is inspired from barebox threads [1]. A notion of thread
group helps with dependencies, such as when a thread needs to block
until a number of other threads have returned.
The name "uthread" comes from "user-space threads" because the
scheduling happens with no help from a higher privileged mode, contrary
to more complex models where kernel threads are defined. But the 'u'
may as well stand for 'U-Boot' since the bootloader may actually be
running at any privilege level and the notion of user vs. kernel may
not make much sense in this context.
[1] https://github.com/barebox/barebox/blob/master/common/bthread.c
Signed-off-by: Jerome Forissier <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
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Jerome Forissier <[email protected]> says:
There is a bug in the print_guid() unit test in test/common/print.c when
PARTITION_TYPE_GUID is not enabled but either CMD_EFIDEBUG or EFI are.
The first patch fixes the issue and the second one enables UNIT_TEST in
the qemu_arm64 defconfig so that the unit tests are run in CI (this
platform has CMD_EFIDEBUG so the bug applies).
Link: https://lore.kernel.org/r/[email protected]
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The name defined for PARTITION_SYSTEM_GUID in list_guid[] depends on
configuration options. It is "system" if CONFIG_PARTITION_TYPE_GUID is
enabled or "System Partition" if CONFIG_CMD_EFIDEBUG or CONFIG_EFI are
enabled. In addition, the unit test in test/common/print.c is incorrect
because it expects only "system" (or a hex GUID).
Make things more consistent by using a clear and unique name: "EFI
System Partition" whatever the configuration, and update the unit test
accordingly.
Signed-off-by: Jerome Forissier <[email protected]>
Suggested-by: Heinrich Schuchardt <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
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UEFI binaries should be executed in EL2 or EL1 even if U-Boot is started
in EL3. Provide a unit test.
Reviewed-by: Ilias Apalodimas <[email protected]>
Signed-off-by: Heinrich Schuchardt <[email protected]>
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Jerome Forissier <[email protected]> says:
This series replaces the dynamic initcalls (with function pointers) with
static calls, and gets rid of initcall_run_list(), init_sequence_f,
init_sequence_f_r and init_sequence_r. This makes the code simpler and the
binary slighlty smaller: -2281 bytes/-0.21 % with LTO enabled and -510
bytes/-0.05 % with LTO disabled (xilinx_zynqmp_kria_defconfig).
Execution time doesn't seem to change noticeably. There is no impact on
the SPL.
The inline assembly fixes, although they look unrelated, are triggered
on some platforms with LTO enabled. For example: kirkwood_defconfig.
CI: https://source.denx.de/u-boot/custodians/u-boot-net/-/pipelines/25514
Link: https://lore.kernel.org/r/[email protected]
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Now that all initcalls have been converted to static calls, remove
initcall_run_list().
Signed-off-by: Jerome Forissier <[email protected]>
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Tom reports that generating the ESL file we need for authenticated
capsule updates fails to work on azure which expects a RO git tree.
Move it to $(objtree)
Reported-by: Tom Rini <[email protected]>
Signed-off-by: Ilias Apalodimas <[email protected]>
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Tom Rini <[email protected]> says:
This series switches to always using $(PHASE_) in Makefiles when
building rather than $(PHASE_) or $(XPL_). It also starts on documenting
this part of the build, but as a follow-up we need to rename
doc/develop/spl.rst and expand on explaining things a bit.
Link: https://lore.kernel.org/r/[email protected]
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It is confusing to have both "$(PHASE_)" and "$(XPL_)" be used in our
Makefiles as part of the macros to determine when to do something in our
Makefiles based on what phase of the build we are in. For consistency,
bring this down to a single macro and use "$(PHASE_)" only.
Signed-off-by: Tom Rini <[email protected]>
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Because we've already returned early in the event 'handle' is NULL we
don't need these extra not NULL checks. Remove them
Signed-off-by: Bryan Brattlof <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
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Since commit 53d5a221632e ("emulation: Use bloblist to hold tables")
`make qemu-riscv64_smode_defconfig acpi.config && make` fails with
qfw_acpi.c:146:(.text.evt_write_acpi_tables+0xc):
undefined reference to `bloblist_add'
Build with bloblist support.
Fixes: 53d5a221632e ("emulation: Use bloblist to hold tables")
Reviewed-by: Ilias Apalodimas <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Signed-off-by: Heinrich Schuchardt <[email protected]>
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commit ddf67daac39d ("efi_capsule: Move signature from DTB to .rodata")
was reverted in
commit 47a25e81d35c ("Revert "efi_capsule: Move signature from DTB to .rodata"")
because that's what U-Boot was usually doing -- using the DT to store
configuration and data. Some of the discussions can be found here [0].
(Ab)using the device tree to store random data isn't ideal though.
On top of that with new features introduced over the years, keeping
the certificates in the DT has proven to be problematic.
One of the reasons is that platforms might send U-Boot a DTB
from the previous stage loader using a transfer list which won't contain
the signatures since other loaders are not aware of internal
U-Boot ABIs. On top of that QEMU creates the DTB on the fly, so adding
the capsule certificate there does not work and requires users to dump
it and re-create it injecting the public keys.
Now that we have proper memory permissions for arm64, move the certificate
to .rodata and read it from there.
[0] https://lore.kernel.org/u-boot/CAPnjgZ2uM=n8Qo-a=DUkx5VW5Bzp5Xy8=Wgmrw8ESqUBK00YJQ@mail.gmail.com/
Signed-off-by: Ilias Apalodimas <[email protected]>
Tested-by: Jonathan Humphreys <[email protected]> # on TI sk-am62p-lp
Tested-by: Neil Armstrong <[email protected]> # on AML-A311D-CC
Tested-by: Raymond Mao <[email protected]>
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The new_packagelist() function of the HII Protocols implementation is
calling malloc() without checking its return code; fix this.
Signed-off-by: Vincent Stehlé <[email protected]>
Cc: Heinrich Schuchardt <[email protected]>
Cc: Ilias Apalodimas <[email protected]>
Cc: Tom Rini <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
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Instead of just printing the label, add information for the Device
path as well so it's easier to see if we are booting from disk, network
etc
Signed-off-by: Ilias Apalodimas <[email protected]>
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Calling bootefi on an address that was loaded from memory (e.g., cramfs
or SPI flash via "sf read", etc.), currently results in the EFI binary
not being able to access the EFI image device path.
For example, iPXE would fail with an error "EFI could not get loaded
image's device path: Error 0x7f39e082 (https://ipxe.org/7f39e082)".
This is due to an incomplete special-case in efi_binary_run, where a new
device path was created but not used in all required places.
Fix the in-memory special case, set the "bootefi_device_path" to the
generated "file_path".
iPXE will now boot, and report the device path as
"/MemoryMapped(0x0,0xSTART,0xLEN)"
Signed-off-by: Christian Kohlschütter <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
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Add support to install an initrd when running an EFI binary
with efi_binary_run
Signed-off-by: Adriano Cordova <[email protected]>
Acked-by: Ilias Apalodimas <[email protected]>
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U-Boot can pass an initrd to subsequent boot stages via the
EFI_LOAD_FILE2_PROTOCOL. The current implementation only supports
this functionality via the efi boot manager: the initrd is taken
from the load options of the BootCurrent variable. This commit adds
support for registering a memory mapped initrd, e.g. loaded from a
FIT image. For now this new method takes precedence over loading the
initrd from the BootCurrent variable (if both are present) because
the BootCurrent variable is not cleared on exiting the boot manager.
Signed-off-by: Adriano Cordova <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
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U-Boot currently reserves only 0x3000 bytes when copying the FDT
in copy_fdt(), which may not be sufficient if additional nodes
(such as FMAN firmware) are added later.
This patch uses the exisitng SYS_FDT_PAD to reserve space for FDT fixup
instead of hardcoded value.
This change prevents potential corruption when resizing FDT after
EFI boot, especially when firmware like FMAN requires additional
space.
Signed-off-by: Gabriel Nesteruk <[email protected]>
Signed-off-by: Pawel Kochanowski <[email protected]>
Reviewed-by: Heinrich Schuchardt <[email protected]>
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When BLOBLIST_TABLES is used, the ACPI tables are not currently added to
the list of EFI tables. While we don't want to create a new memory
region, we do want to tell EFI about the tables.
Fix this by covering this case. At some point the non-bloblist code can
likely be removed.
Signed-off-by: Simon Glass <[email protected]>
Fixes: 3da59ee9579 ("efi_loader: Avoid mapping the ACPI tables twice")
Signed-off-by: Patrick Rudolph <[email protected]>
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Now that capsule update sets the dfu_alt_info environment variable
explicitly, there is no need to support it in the set_dfu_alt_info()
function. Decouple SET_DFU_ALT_INFO from EFI_CAPSULE_FIRMWARE_FIT and
EFI_CAPSULE_FIRMWARE_RAW. For many boards, this was the only use of
set_dfu_alt_info() so remove the function entirely.
Fixes: a9e6f01a941f ("efi: Define set_dfu_alt_info() for boards with UEFI capsule update enabled")
Signed-off-by: Jonathan Humphreys <[email protected]>
Signed-off-by: Michal Simek <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>
Reviewed-by: Neil Armstrong <[email protected]> # for board/libre-computer/*
Reviewed-by: Ilias Apalodimas <[email protected]>
Reviewed-by: Wadim Egorov <[email protected]> # for
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The current implementation of EFI capsule update uses set_dfu_alt_info() to
set the dfu_alt_info environment variable with the settings it requires.
However, set_dfu_alt_info() is doing this for all DFU operations, even
those unrelated to capsule update.
Thus other uses of DFU, such as DFU boot which sets its own value for the
dfu_alt_info environment variable, will have that setting overwritten with
the capsule update setting. Similarly, any user defined value for the
dfu_alt_info environment variable would get overwritten when any DFU
operation was performed, including simply performing a "dfu 0 list"
command.
The solution is stop using the set_dfu_alt_info() mechanism to set the
dfu_alt_info environment variable and instead explicitly set it to the
capsule update's setting just before performing the capsule update's DFU
operation, and then restore the environment variable back to its original
value.
This patch implements the explicit setting and restoring of the
dfu_alt_info environment variable as part of the EFI capsule update
operation.
The fix is fully implemented in a subsequent patch that removes the capsule
update dfu_alt_info support in set_dfu_alt_info().
Signed-off-by: Jonathan Humphreys <[email protected]>
Reviewed-by: Mattijs Korpershoek <[email protected]>
Reviewed-by: Ilias Apalodimas <[email protected]>
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Andre Przywara <[email protected]> says:
C's implicit fallthrough behaviour in switch/case statements can lead to
subtle bugs. Quite some while ago many compilers introduced warnings in
those cases, requiring intentional fallthrough's to be annotated.
So far we were not enabling that compiler option, so many ambiguities
and some bugs in the code went unnoticed.
This series adds the required annotations in code paths that the first
stage of the U-Boot CI covers. There is a large number of cases left
in the libbz2 code. The usage of switch/case is borderline insane there,
labels are hidden in macros, and there are no breaks, but just goto's.
Upstream still uses very similar code, without any annotations. I still
am not 100% sure those are meant to fall through or not, and plan to do
further investigations, but didn't want to hold the rest of the patches
back. You can see for yourself by applying patch 18/18 and building for
sandbox64, for instance.
Because of this we cannot quite enable the warning in the Makefile yet,
but those fixes are worth regardless, and be it to increase readability.
Please note that those patches do not fix anything, really, they just add
those fallthrough annotations, so the series is not really critical.
Link: https://lore.kernel.org/r/[email protected]
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In some cases in the generic code, we were already using switch/case
fallthrough annotations comments, though in a way which might not be
understood by most compilers.
Replace two non-standard /* no break */ comments with our fallthrough;
statement-like macro, to make this visible to the compiler.
Also use this macro in place of an /* Fall through */ comment, to be
more consistent.
Signed-off-by: Andre Przywara <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
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The inflate state machine in zlib uses switch/case fall-through's
extensively, as it sometimes advances the state, and lets the
conveniently placed next case statement handle the new state already.
The pattern here is:
state->mode = LEN;
case LEN:
Annotate those occasions with the "fallthrough;" macro, to let compilers
know this is fine when using -Wimplicit-fallthrough.
This mimics the upstream commit 76f70abbc73f:
Author: Mark Adler <[email protected]>
Date: Sun Mar 27 00:12:38 2022 -0700
Subject: Add fallthrough comments for gcc.
Signed-off-by: Andre Przywara <[email protected]>
Link: https://github.com/madler/zlib/commit/76f70abbc73f
Reviewed-by: Tom Rini <[email protected]>
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Heinrich Schuchardt <[email protected]> says:
Introduce a new function to update ACPI table headers.
This allows to simplify the existing code.
Link: https://lore.kernel.org/r/[email protected]
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If tiny printf is used with 0x%08X (upper case X) the output is
always 0x00000000. It could be confusing if upper case instead
of lower case is used intentionally or accidentally because the
actual value is not output. To avoid this confusion, treat output
of %X as %x. As a compromise for tiny printf, the hex value is
then output correctly, but in lower case. This is done to keep it
tiny printf small.
Signed-off-by: Christoph Niedermaier <[email protected]>
Reviewed-by: Tom Rini <[email protected]>
Reviewed-by: Marek Vasut <[email protected]>
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