Revert "mm/slub: use stackdepot to save stack trace in objects"
This reverts commit 78869146. It's not clear why, but it causes unexplained problems in entirely unrelated xfs code. The most likely explanation is some slab corruption, possibly triggered due to CONFIG_SLUB_DEBUG_ON. See . It ends up having a few other problems too, like build errors on arch/arc, and Geert reporting it using much more memory on m68k  (it probably does so elsewhere too, but it is probably just more noticeable on m68k). The architecture issues (both build and memory use) are likely just because this change effectively force-enabled STACKDEPOT (along with a very bad default value for the stackdepot hash size). But together with the xfs issue, this all smells like "this commit was not ready" to me. Link: https://lore.kernel.org/linux-xfs/YPE3l82acwgI2OiV@infradead.org/  Link: https://lore.kernel.org/lkml/202107150600.LkGNb4Vbfirstname.lastname@example.org/  Link: https://lore.kernel.org/lkml/CAMuHMdW=eoVzM1Re5FVoEN87nKfiLmM2+Ah7eNu2KXEhCvbZyA@mail.gmail.com/  Reported-by: Christoph Hellwig <email@example.com> Reported-by: kernel test robot <firstname.lastname@example.org> Reported-by: Geert Uytterhoeven <email@example.com> Cc: Andrew Morton <firstname.lastname@example.org> Cc: Vlastimil Babka <email@example.com> Cc: Randy Dunlap <firstname.lastname@example.org> Signed-off-by: Linus Torvalds <email@example.com>