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nixpkgs/pkgs/os-specific/linux/kernel/modinst-arg-list-too-long.patch

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linux-testing: Fix arg list too long in modinst With the default kernel and thus with the build I have tested in 74ec94bfa2e57e2c0beeee0e469de58391d04a7b, we get an error during modules_install: make[2]: execvp: /nix/store/.../bin/bash: Argument list too long I haven't noticed this build until I actually tried booting using this kernel because make didn't fail here. The reason this happens within Nix and probably didn't yet surface in other distros is that programs only have a limited amount of memory available for storing the environment and the arguments. Environment variables however are quite common on Nix and thus we stumble on problems like this way earlier - in this case Linux 4.8 - but I have noticed this in 4.7-next as well already. The fix is far from perfect and suffers performance overhead because we now run grep for every *.mod file instead of passing all *.mod files into one single invocation of grep. But comparing the performance overhead (around 1s on my machine) with the overall build time of the kernel I think the overhead really is neglicible. Signed-off-by: aszlig <aszlig@redmoonstudios.org>
2016-08-30 06:26:12 +02:00
diff --git a/scripts/Makefile.modinst b/scripts/Makefile.modinst
index 07650ee..934a7a8 100644
--- a/scripts/Makefile.modinst
+++ b/scripts/Makefile.modinst
@@ -9,7 +9,8 @@ include scripts/Kbuild.include
#
-__modules := $(sort $(shell grep -h '\.ko$$' /dev/null $(wildcard $(MODVERDIR)/*.mod)))
+__modules := $(sort $(foreach f,$(wildcard $(MODVERDIR)/*.mod),$(shell \
+ grep -h '\.ko$$' '$f')))
modules := $(patsubst %.o,%.ko,$(wildcard $(__modules:.ko=.o)))
PHONY += $(modules)
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