Buildresult: linus/44x/fsp2_defconfig/powerpc-gcc5 built on Jul 18 2018, 11:37

kisskb

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Status:	OK
Date/Time:	Jul 18 2018, 11:37
Duration:	0:00:58.610129
Builder:	ka2
Revision:	Mark HI and TASKLET softirq synchronous (`3c53776e29f81719efcf8f7a6e30cdf753bee94d)`
Target:	linus/44x/fsp2_defconfig/powerpc-gcc5
Branch:	linus
Compiler:	powerpc-gcc5 (powerpc64-linux-gcc (GCC) 5.3.0)
Config:	44x/fsp2_defconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify 3c53776e29f81719efcf8f7a6e30cdf753bee94d^{commit} 3c53776e29f81719efcf8f7a6e30cdf753bee94d already have revision, skipping fetch # git checkout -q -f -B kisskb 3c53776e29f81719efcf8f7a6e30cdf753bee94d # git clean -qxdf # < git log -1 # commit 3c53776e29f81719efcf8f7a6e30cdf753bee94d # Author: Linus Torvalds <torvalds@linux-foundation.org> # Date: Mon Jan 8 11:51:04 2018 -0800 # # Mark HI and TASKLET softirq synchronous # # Way back in 4.9, we committed 4cd13c21b207 ("softirq: Let ksoftirqd do # its job"), and ever since we've had small nagging issues with it. For # example, we've had: # # 1ff688209e2e ("watchdog: core: make sure the watchdog_worker is not deferred") # 8d5755b3f77b ("watchdog: softdog: fire watchdog even if softirqs do not get to run") # 217f69743681 ("net: busy-poll: allow preemption in sk_busy_loop()") # # all of which worked around some of the effects of that commit. # # The DVB people have also complained that the commit causes excessive USB # URB latencies, which seems to be due to the USB code using tasklets to # schedule USB traffic. This seems to be an issue mainly when already # living on the edge, but waiting for ksoftirqd to handle it really does # seem to cause excessive latencies. # # Now Hanna Hawa reports that this issue isn't just limited to USB URB and # DVB, but also causes timeout problems for the Marvell SoC team: # # "I'm facing kernel panic issue while running raid 5 on sata disks # connected to Macchiatobin (Marvell community board with Armada-8040 # SoC with 4 ARMv8 cores of CA72) Raid 5 built with Marvell DMA engine # and async_tx mechanism (ASYNC_TX_DMA [=y]); the DMA driver (mv_xor_v2) # uses a tasklet to clean the done descriptors from the queue" # # The latency problem causes a panic: # # mv_xor_v2 f0400000.xor: dma_sync_wait: timeout! # Kernel panic - not syncing: async_tx_quiesce: DMA error waiting for transaction # # We've discussed simply just reverting the original commit entirely, and # also much more involved solutions (with per-softirq threads etc). This # patch is intentionally stupid and fairly limited, because the issue # still remains, and the other solutions either got sidetracked or had # other issues. # # We should probably also consider the timer softirqs to be synchronous # and not be delayed to ksoftirqd (since they were the issue with the # earlier watchdog problems), but that should be done as a separate patch. # This does only the tasklet cases. # # Reported-and-tested-by: Hanna Hawa <hannah@marvell.com> # Reported-and-tested-by: Josef Griebichler <griebichler.josef@gmx.at> # Reported-by: Mauro Carvalho Chehab <mchehab@s-opensource.com> # Cc: Alan Stern <stern@rowland.harvard.edu> # Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org> # Cc: Eric Dumazet <edumazet@google.com> # Cc: Ingo Molnar <mingo@kernel.org> # Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> # < /opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < git log --format=%s --max-count=1 3c53776e29f81719efcf8f7a6e30cdf753bee94d # < make -s -j 48 ARCH=powerpc O=/kisskb/build/linus_44x_fsp2_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux- 44x/fsp2_defconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/linus_44x_fsp2_defconfig_powerpc-5.3 CROSS_COMPILE=/opt/cross/kisskb/gcc-5.3.0-nolibc/powerpc64-linux/bin/powerpc64-linux- INFO: Uncompressed kernel (size 0x8a0a24) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0x900000) Image Name: Linux-4.18.0-rc5-g3c53776 Created: Wed Jul 18 11:38:27 2018 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 3901399 Bytes = 3809.96 kB = 3.72 MB Load Address: 00000000 Entry Point: 00000000 Completed OK # rm -rf /kisskb/build/linus_44x_fsp2_defconfig_powerpc-5.3 # Build took: 0:00:58.610129

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