This week at LWN: Bisection divides users and developers
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The last couple of years have seen a renewed push within the kernel community to avoid regressions. When a patch is found to have broken something that used to work, a fix must be merged or the offending patch will be removed from the kernel. It's a straightforward and logical idea, but there's one little problem: when a kernel series includes over 12,000 changesets (as 2.6.25 does), how does one find the patch which caused the problem? Sometimes it will be obvious, but, for other problems, there are literally thousands of patches which could be the source of the regression. Digging through all of those patches in search of a bug can be a needle-in-the-haystack sort of proposition.
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