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a=z/mQ4Ysz8XfWz/Q5cLBRGdckG28=:19 a=lCpzRmAYbLLaTzLvsPZ7Mbvzbb8=:19 a=xqWC_Br6kY4A:10 a=IkcTkHD0fZMA:10 a=Yq5XynenixoA:10 a=VkNPw1HP01LnGYTKEx00:22 a=bi6dqmuHe4P4UrxVR6um:22 a=HK-ge7EqtdluswH-FwHe:22 a=VwQbUJbxAAAA:8 a=Q-fNiiVtAAAA:8 a=NEAV23lmAAAA:8 a=Ptvq9zoxAAAA:8 a=t7CeM3EgAAAA:8 a=1XWaLZrsAAAA:8 a=f0Godis_OerY_O3KWRMA:9 a=3ZKOabzyN94A:10 a=QEXdDO2ut3YA:10 a=ke9shIQgfMkOMJk9-b84:22 a=FdTzh2GWekK77mhwV6Dw:22 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1121,Hydra:6.1.51,FMLib:17.12.100.49 definitions=2026-03-04_01,2026-03-03_01,2025-10-01_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 suspectscore=0 malwarescore=0 priorityscore=1501 adultscore=0 clxscore=1011 impostorscore=0 lowpriorityscore=0 spamscore=0 phishscore=0 bulkscore=0 classifier=typeunknown authscore=0 authtc= authcc= route=outbound adjust=0 reason=mlx scancount=1 engine=8.22.0-2602130000 definitions=main-2603040020 On 3/4/26 06:33, Ian Rogers wrote: > CAUTION: This email comes from a non Wind River email account! > Do not click links or open attachments unless you recognize the sender and know the content is safe. > > On Mon, Oct 27, 2025 at 7:16 PM Changqing Li wrote: >> Hi, Ian >> >> Kindly ping. Could you reproduce it? Any comments? > Sorry Changqing, > > I was reminded by: > https://lore.kernel.org/lkml/20260303211503.165337-1-mmayer@broadcom.com/ > that "argument list too long" is a problem for others. > > I tried reproducing it, but I think it doesn't fail for me, possibly > because MAX_ARGS is larger on my system: > ``` > $ xargs --show-limits > Your environment variables take up 6133 bytes > POSIX upper limit on argument length (this system): 2088971 > POSIX smallest allowable upper limit on argument length (all systems): 4096 > Maximum length of command we could actually use: 2082838 > Size of command buffer we are actually using: 131072 > Maximum parallelism (--max-procs must be no greater): 2147483647 > ``` > > Anyway, the change makes sense to me. > > Reviewed-by: Ian Rogers > > Thanks, > Ian > Hi, Ian Thanks.  I also cannot reproduce with previous length of tmpdir, maybe caused by perf source changes during this period， but I can still reproduce after I make the tmpdir longer. $ xargs --show-limits Your environment variables take up 3124 bytes POSIX upper limit on argument length (this system): 2091980 POSIX smallest allowable upper limit on argument length (all systems): 4096 Maximum length of command we could actually use: 2088856 Size of command buffer we are actually using: 131072 Maximum parallelism (--max-procs must be no greater): 2147483647 Regards Changqing >> Regards >> >> Changqing >> >> On 8/19/25 11:01, Changqing Li wrote: >>> On 8/19/25 04:38, Ian Rogers wrote: >>>> CAUTION: This email comes from a non Wind River email account! >>>> Do not click links or open attachments unless you recognize the >>>> sender and know the content is safe. >>>> >>>> On Mon, Jul 28, 2025 at 2:31 AM wrote: >>>>> From: Changqing Li >>>>> >>>>> The command length of in-target scales with the depth of the directory >>>>> times the number of objects in the Makefile. When there are many >>>>> objects, and O=[absolute_path] is set, and the absolute_path is >>>>> relatively long. It is possile that this line "$(call >>>>> if_changed,$(host)ld_multi)" will report error: >>>>> "make[4]: /bin/sh: Argument list too long" >>>>> >>>>> For example, build perf tools with O=/long/output/path >>>>> >>>>> Like built-in.a and *.mod rules in scripts/Makefile.build, add >>>>> $(objpredix)/ by the shell command instead of by Make's builtin >>>>> function. >>>>> >>>>> Signed-off-by: Changqing Li >>>> Thanks Changqing, the change makes sense to me. The printf is pushing >>>> the values into xargs rather than using $^ with ld. I've tried >>>> reproducing the error to test your fix by creating long directory >>>> names in /tmp and then passing them to O=. I've not been able to do >>>> this. Could you send a reproduction for me to test? >>>> >>>> Thanks, >>>> Ian >>> Hi, Ian >>> >>> Thanks. Here is my steps: >>> >>> 1. git clone https://github.com/torvalds/linux.git >>> >>> 2. cd linux/tools/perf/ >>> >>> 3. mkdir >>> /tmp/01234567890123456789/0123456789012345678901234567890123456789/0123456789012345678901234567890123456789/012345678901234567890123456789/01234567890123456789/012345678901234567890123456789/01234567890123456789012345678/9012345678901234567890123456789/012345678901234567890123456789/012345678901234567890123456789/01234567890123456789012345678901234567890123456789012345678901234567890123/perf-1.0 >>> >>> 4. make NO_LIBTRACEEVENT=1 >>> O=/tmp/01234567890123456789/0123456789012345678901234567890123456789/0123456789012345678901234567890123456789/012345678901234567890123456789/01234567890123456789/012345678901234567890123456789/01234567890123456789012345678/9012345678901234567890123456789/012345678901234567890123456789/012345678901234567890123456789/01234567890123456789012345678901234567890123456789012345678901234567890123/perf-1.0 >>> >>> >>> 5. Above step failed with error: >>> >>> make[4]: /bin/sh: Argument list too long >>> >>> make[4]: *** [/buildarea2/cli10/tmp/linux/tools/build/Makefile.build >>> :148: >>> /tmp/01234567890123456789/0123456789012345678901234567890123456789/0123456789012345678901234567890123456789/012345678901234567890123456789/01234567890123456789/012345678901234567890123456789/01234567890123456789012345678/9012345678901234567890123456789/012345678901234567890123456789/012345678901234567890123456789/01234567890123456789012345678901234567890123456789012345678901234567890123/perf-1.0/util/perf-util-in.o] >>> Error 127 >>> >>> make[3]: *** [/buildarea2/cli10/tmp/linux/tools/build/Makefile.build >>> :142: >>> util] Error 2 >>> >>> make[2]: *** [Makefile.perf:797: >>> /tmp/01234567890123456789/0123456789012345678901234567890123456789/0123456789012345678901234567890123456789/012345678901234567890123456789/01234567890123456789/012345678901234567890123456789/01234567890123456789012345678/9012345678901234567890123456789/012345678901234567890123456789/012345678901234567890123456789/01234567890123456789012345678901234567890123456789012345678901234567890123/perf-1.0/perf-util-in.o] >>> Error 2 >>> >>> >>> Regards >>> >>> Changqing >>>>> --- >>>>> tools/build/Makefile.build | 6 ++++-- >>>>> 1 file changed, 4 insertions(+), 2 deletions(-) >>>>> >>>>> diff --git a/tools/build/Makefile.build b/tools/build/Makefile.build >>>>> index 3584ff308607..39066a3ef2fc 100644 >>>>> --- a/tools/build/Makefile.build >>>>> +++ b/tools/build/Makefile.build >>>>> @@ -70,11 +70,13 @@ quiet_cmd_gen = GEN $@ >>>>> # If there's nothing to link, create empty $@ object. >>>>> quiet_cmd_ld_multi = LD $@ >>>>> cmd_ld_multi = $(if $(strip $(obj-y)),\ >>>>> - $(LD) -r -o $@ $(filter $(obj-y),$^),rm -f >>>>> $@; $(AR) rcs $@) >>>>> + printf "$(objprefix)%s " $(patsubst >>>>> $(objprefix)%,%,$(filter $(obj-y),$^)) | \ >>>>> + xargs $(LD) -r -o $@,rm -f $@; $(AR) rcs $@) >>>>> >>>>> quiet_cmd_host_ld_multi = HOSTLD $@ >>>>> cmd_host_ld_multi = $(if $(strip $(obj-y)),\ >>>>> - $(HOSTLD) -r -o $@ $(filter >>>>> $(obj-y),$^),rm -f $@; $(HOSTAR) rcs $@) >>>>> + printf "$(objprefix)%s " $(patsubst >>>>> $(objprefix)%,%,$(filter $(obj-y),$^)) | \ >>>>> + xargs $(HOSTLD) -r -o $@,rm -f $@; >>>>> $(HOSTAR) rcs $@) >>>>> >>>>> ifneq ($(filter $(obj),$(hostprogs)),) >>>>> host = host_ >>>>> -- >>>>> 2.34.1 >>>>>