Messages in this thread | | | Subject | Re: [PATCH] x86/kbuild: enable modversions for symbols exported from asm | From | Stanislav Kozina <> | Date | Tue, 13 Dec 2016 02:07:42 +0100 |
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Hello,
>> That said, a dwarf based checker tool should be able to do as good a job >> (maybe a bit better because report is very informative and it may pick up >> compiler alignments or padding options). > So, Nicholas was kind enough to send me the two Linux Kernel binaries > that he built with the tiny little interface change that we were > discussing earlier. Here is what the abidiff[1] tools says about that > interface change:
Thanks Nicholas and Dodji for this great example, for comparison I think it would be nice to share the example run with kabi-dw too. kabi-dw first dumps and unifies all type information into a set of text files, the unification takes a significant time. Then the two sets of these text files can be compared.
An example run would look like: $ time ~/Code/kabi-dw/kabi-dw generate -o abi1 vmlinux.abi1 Generating symbol defs from vmlinux.abi1...
real 0m29.057s user 0m13.929s sys 0m14.862s $ time ~/Code/kabi-dw/kabi-dw generate -o abi2 vmlinux.abi2 Generating symbol defs from vmlinux.abi2...
real 0m29.134s user 0m13.961s sys 0m14.921s $ time ~/Code/kabi-dw/kabi-dw compare abi1 abi2 Changes detected in: home/npiggin/src/linux.vectors/mm/memory.c/struct--blah.txt Inserted: +0x0 int y; Shifted: -0x0 int x; +0x4 int x;
real 0m0.176s user 0m0.135s sys 0m0.040s
The size of the generated text files with all the relevant type information is as follows: $ du -hs abi1 16M abi1 $ find abi1 -type f | wc -l 3162
Warm regards, -Stanislav
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