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From: Sasha Levin <sashal@kernel.org>
To: linux-kernel@vger.kernel.org, stable@vger.kernel.org
Cc: Masahiro Yamada <masahiroy@kernel.org>,
	Sasha Levin <sashal@kernel.org>,
	linux-kbuild@vger.kernel.org
Subject: [PATCH AUTOSEL 5.4 22/51] kbuild: sink stdout from cmd for silent build
Date: Wed, 14 Jul 2021 15:44:44 -0400	[thread overview]
Message-ID: <20210714194513.54827-22-sashal@kernel.org> (raw)
In-Reply-To: <20210714194513.54827-1-sashal@kernel.org>

From: Masahiro Yamada <masahiroy@kernel.org>

[ Upstream commit 174a1dcc96429efce4ef7eb2f5c4506480da2182 ]

When building with 'make -s', no output to stdout should be printed.

As Arnd Bergmann reported [1], mkimage shows the detailed information
of the generated images.

I think this should be suppressed by the 'cmd' macro instead of by
individual scripts.

Insert 'exec >/dev/null;' in order to redirect stdout to /dev/null for
silent builds.

[Note about this implementation]

'exec >/dev/null;' may look somewhat tricky, but this has a reason.

Appending '>/dev/null' at the end of command line is a common way for
redirection, so I first tried this:

  cmd = @set -e; $(echo-cmd) $(cmd_$(1)) >/dev/null

... but it would not work if $(cmd_$(1)) itself contains a redirection.

For example, cmd_wrap in scripts/Makefile.asm-generic redirects the
output from the 'echo' command into the target file.

It would be expanded into:

  echo "#include <asm-generic/$*.h>" > $@ >/dev/null

Then, the target file gets empty because the string will go to /dev/null
instead of $@.

Next, I tried this:

  cmd = @set -e; $(echo-cmd) { $(cmd_$(1)); } >/dev/null

The form above would be expanded into:

  { echo "#include <asm-generic/$*.h>" > $@; } >/dev/null

This works as expected. However, it would be a syntax error if
$(cmd_$(1)) is empty.

When CONFIG_TRIM_UNUSED_KSYMS is disabled, $(call cmd,gen_ksymdeps) in
scripts/Makefile.build would be expanded into:

  set -e;  { ; } >/dev/null

..., which causes an syntax error.

I also tried this:

  cmd = @set -e; $(echo-cmd) ( $(cmd_$(1)) ) >/dev/null

... but this causes a syntax error for the same reason.

So, finally I adopted:

  cmd = @set -e; $(echo-cmd) exec >/dev/null; $(cmd_$(1))

[1]: https://lore.kernel.org/lkml/20210514135752.2910387-1-arnd@kernel.org/

Signed-off-by: Masahiro Yamada <masahiroy@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 scripts/Kbuild.include | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/scripts/Kbuild.include b/scripts/Kbuild.include
index 7da10afc92c6..b14a7d4a2f05 100644
--- a/scripts/Kbuild.include
+++ b/scripts/Kbuild.include
@@ -182,8 +182,13 @@ clean := -f $(srctree)/scripts/Makefile.clean obj
 echo-cmd = $(if $($(quiet)cmd_$(1)),\
 	echo '  $(call escsq,$($(quiet)cmd_$(1)))$(echo-why)';)
 
+# sink stdout for 'make -s'
+       redirect :=
+ quiet_redirect :=
+silent_redirect := exec >/dev/null;
+
 # printing commands
-cmd = @set -e; $(echo-cmd) $(cmd_$(1))
+cmd = @set -e; $(echo-cmd) $($(quiet)redirect) $(cmd_$(1))
 
 ###
 # if_changed      - execute command if any prerequisite is newer than
-- 
2.30.2


  parent reply	other threads:[~2021-07-14 19:53 UTC|newest]

Thread overview: 51+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-07-14 19:44 [PATCH AUTOSEL 5.4 01/51] ARM: dts: gemini: rename mdio to the right name Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 02/51] ARM: dts: gemini: add device_type on pci Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 03/51] ARM: dts: rockchip: fix pinctrl sleep nodename for rk3036-kylin and rk3288 Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 04/51] arm64: dts: rockchip: fix pinctrl sleep nodename for rk3399.dtsi Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 05/51] ARM: dts: rockchip: Fix the timer clocks order Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 06/51] ARM: dts: rockchip: Fix IOMMU nodes properties on rk322x Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 07/51] ARM: dts: rockchip: Fix power-controller node names for rk3066a Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 08/51] ARM: dts: rockchip: Fix power-controller node names for rk3188 Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 09/51] ARM: dts: rockchip: Fix power-controller node names for rk3288 Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 10/51] arm64: dts: rockchip: Fix power-controller node names for px30 Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 11/51] arm64: dts: rockchip: Fix power-controller node names for rk3328 Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 12/51] reset: ti-syscon: fix to_ti_syscon_reset_data macro Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 13/51] ARM: brcmstb: dts: fix NAND nodes names Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 14/51] ARM: Cygnus: " Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 15/51] ARM: NSP: " Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 16/51] ARM: dts: BCM63xx: Fix " Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 17/51] ARM: dts: Hurricane 2: " Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 18/51] ARM: dts: imx25-pinfunc: Fix gpio function name for pads GPIO_[A-F] Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 19/51] ARM: dts: imx6: phyFLEX: Fix UART hardware flow control Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 20/51] ARM: imx: pm-imx5: Fix references to imx5_cpu_suspend_info Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 21/51] rtc: mxc_v2: add missing MODULE_DEVICE_TABLE Sasha Levin
2021-07-14 19:44 ` Sasha Levin [this message]
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 23/51] ARM: dts: am335x: align GPIO hog names with dt-schema Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 24/51] ARM: dts: am437x: align gpio " Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 25/51] ARM: dts: omap3: " Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 26/51] ARM: dts: omap5-board-common: " Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 27/51] ARM: dts: dra7x-evm: Align GPIO " Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 28/51] ARM: dts: am57xx-cl-som-am57x: fix ti,no-reset-on-init flag for gpios Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 29/51] ARM: dts: am437x-gp-evm: " Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 30/51] ARM: dts: stm32: fix gpio-keys node on STM32 MCU boards Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 31/51] ARM: dts: stm32: fix RCC node name on stm32f429 MCU Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 32/51] ARM: dts: stm32: fix timer nodes on STM32 MCU to prevent warnings Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 33/51] arm64: dts: juno: Update SCPI nodes as per the YAML schema Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 34/51] ARM: dts: rockchip: fix supply properties in io-domains nodes Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 35/51] ARM: dts: stm32: fix i2c node name on stm32f746 to prevent warnings Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 36/51] ARM: dts: stm32: move stmmac axi config in ethernet node on stm32mp15 Sasha Levin
2021-07-14 19:44 ` [PATCH AUTOSEL 5.4 37/51] soc/tegra: fuse: Fix Tegra234-only builds Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 38/51] firmware: tegra: bpmp: " Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 39/51] arm64: dts: ls208xa: remove bus-num from dspi node Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 40/51] arm64: dts: imx8mq: assign PCIe clocks Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 41/51] thermal/core: Correct function name thermal_zone_device_unregister() Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 42/51] kbuild: mkcompile_h: consider timestamp if KBUILD_BUILD_TIMESTAMP is set Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 43/51] rtc: max77686: Do not enforce (incorrect) interrupt trigger type Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 44/51] scsi: aic7xxx: Fix unintentional sign extension issue on left shift of u8 Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 45/51] scsi: libsas: Add LUN number check in .slave_alloc callback Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 46/51] scsi: be2iscsi: Fix some missing space in some messages Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 47/51] scsi: libfc: Fix array index out of bound exception Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 48/51] scsi: qedf: Add check to synchronize abort and flush Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 49/51] sched/fair: Fix CFS bandwidth hrtimer expiry type Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 50/51] s390: introduce proper type handling call_on_stack() macro Sasha Levin
2021-07-14 19:45 ` [PATCH AUTOSEL 5.4 51/51] cifs: prevent NULL deref in cifs_compose_mount_options() Sasha Levin

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