> There is a libunwind test-case that used to work fine but fails with > recent kernels (e.g., 2.6.23-rc2). The problem is exhibited by the > attached test program. It attempts to map the page right after the > register-backing-store area with a no-access page. The mmap call > succeeds, but the kernel incorrectly maps the no-access page not at > the desired location, but at the next page. If I specify MAP_FIXED, > the mmap() call succeeds, but I don't think MAP_FIXED should be > necessary here. Anybody can think of any patches that would explain > this change of behavior? It's perfectly legal for the OS to ignore the address if you don't specify the MAP_FIXED flag. The "start" argument to mmap is just a hint. Possibly some code is trying to leave a red-zone between mapped areas? Or perhaps we just have an off-by-one error when computing the address. -Tony - To unsubscribe from this list: send the line "unsubscribe linux-ia64" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
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