Looks like it did not take much to actually come back with an answer. So, In file: https://github.com/torvalds/linux/blob/v4.1/tools/perf/Makefile.perf Line 75: # Define NO_LZMA if you do not want to support compressed (xz) kernel modules
Then file: https://github.com/torvalds/linux/blob/v4.1/tools/perf/config/Makefile Lines 544-553: ifndef NO_LZMA ifeq ($(feature-lzma), 1) CFLAGS += -DHAVE_LZMA_SUPPORT EXTLIBS += -llzma $(call detected,CONFIG_LZMA) else msg := $(warning No liblzma found, disables xz kernel module decompression, please install xz-devel/liblzma-dev); NO_LZMA := 1 endif endif In my case it seems to enable by default. Looking at the same files in 3.18: https://github.com/torvalds/linux/blob/v3.18/tools/perf/config/Makefile https://github.com/torvalds/linux/blob/v3.18/tools/perf/Makefile.perf No mention of these. Going a bit deeper, I found this commit: https://github.com/torvalds/linux/commit/80a32e5b498a7547073e5e4b2b804edc7219979d where LZMA compression gets added to perf. Looks like it was enabled default in upstream. So, I guess, we could build perf with NO_LZMA:=1 defined and we could disable it. No strong preferences from me. Your call :) On Mon, Oct 26, 2015 at 12:58 PM, John Crispin <blo...@openwrt.org> wrote: > thanks ! the patch looks good but i am failing to understand why the > lzma needs to be added :) > > On 26/10/2015 11:52, Alexandru Ardelean wrote: > > Ah, sorry about this. > > I forgot about it ; completely swamped. > > > > Will add it in my desktop notes that I keep and come back with an answer > > asap (hopefully today/tomorrow). > > > > > > On Mon, Oct 26, 2015 at 12:13 PM, John Crispin <blo...@openwrt.org > > <mailto:blo...@openwrt.org>> wrote: > > > > > > > > On 21/10/2015 20:03, John Crispin wrote: > > > > > > > > > On 15/10/2015 15:01, Alexandru Ardelean wrote: > > >> This fix contains 2 parts: > > >> - kernel 4.1: backport upstream patch "perf build: Do not fail > on missing Build file" > > >> - add +liblzma dependency > > >> > > > > > > did you find out why there is suddenly a dependency on lzma ? > > > > > > John > > > > > > ping ... > > > > >
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