Messages in this thread | | | Date | Wed, 30 Apr 2008 14:17:38 +0200 | From | Björn Steinbrink <> | Subject | Re: [PATCH] x86: !x & y typo in mtrr code |
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On 2008.04.30 11:32:33 +0200, Ingo Molnar wrote: > Automating Sparse runs so that it can become part of our daily > patch-flow is _not_ trivial and it's not just a matter of typing make > C=1. Thomas is working on integrating Sparse delta analysis into our > daily patch workflow nevertheless.
Who said daily? More often can be better, but just before the pull request is still better than nothing. And even some very basic and stupid filtering can make the sparse output more feasible without losing "too much" information (my stupid approach here can fail for example when you remove an error of one class while introducing another one of the same class).
Given the merge of x86.git that introduced this specific bug we have: 9e9abecf - "merge x86.git"
Now we can get: $ git merge-base 9e9abecf^1 9e9abecf^2 4b119e21d0c66c22e8ca03df05d9de623d0eb50f
So you branched at 4b119e21... (your history is linear, that helps here)
To get the same information before the merge happened upstream, in your local repo, you can do: git merge-base for-linus origin/master (or whatever your branches are called)
# So we get the old upstream version: git checkout 4b119e21d0c # setup config, whatever make make C=2 2>old-sparse
# Then the state of your tree right before the merge: git checkout 9e9abecf^2 make make C=2 2>new-sparse
# And now some stupid sorting and cleaning: sort old-sparse | sed -e 's/^\([^:]*\):[^:]*:[^:]*:/\1:/' > old-sparsef sort new-sparse | sed -e 's/^\([^:]*\):[^:]*:[^:]*:/\1:/' > new-sparsef
# How many old sparse warnings are gone now (approx.)? $ diff old-sparsef new-sparsef | grep -c '^< [^ ]*:' 33
# And how many new do we have (approx.)? $ diff old-sparsef new-sparsef | grep -c '^> [^ ]*:' 36
Depending on the order of the sed and sort commands, you get slightly different output, due to code moving around or whatever, of course to get that "mostly" right it takes more than the 5 minutes of thinking that I spent on it.
In those cases in which there is more than 1 line per warning, the output is obivously messed up here, so the actual number of real warnings from sparse that are left is even lower than the number above (26 for gone and new warnings in this case). And you can also only use the filtered messages to navigate the original sparse log, because the line numbers are stripped and the messed up ordering of multi-line warnings, but well, shouldn't be too bad.
Slap another level of filtering on it that can ignore warnings that are known to be bogus or in which you're simply not interested or whatever and you're down to a pretty manageable set of warnings I guess.
Finally, yeah, I know, this approach is far from perfect, but in my nobody-should-care-about-it opinion, it's better than nothing and it's probably not too hard for you (or Thomas) to come up with a less stupid filtering strategy, that's less error-prone than my hack.
Björn -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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