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Wed, 11 Sep 2024 17:51:16 +0000 From: Lorenzo Stoakes To: Andrew Morton Cc: Richard Narron , Eric Dumazet , Jakub Kicinski , Paolo Abeni , Hans de Goede , Mauro Carvalho Chehab , Sakari Ailus , Greg Kroah-Hartman , Marcin Wojtas , Russell King , "David S . 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This issue was introduced by commit 867046cc7027 ("minmax: relax check to allow comparison between unsigned arguments and signed constants") [0]. Work has been done to address the issue of egregious min()/max() macro expansion in commit 22f546873149 ("minmax: improve macro expansion and type checking") and related, however it appears that some issues remain on more tightly constrained systems. Adjust a few known-bad cases of deeply nested macros to avoid doing so to mitigate this. Porting the patch first proposed in [1] to Linus's tree. Note that we use clamp_t() rather than clamp() when we otherwise could use the latter because it isn't certain than the clamp() won't expand into a more egregiously huge form, certainly prior to the recent fixes. Running an allmodconfig build using the methodology described in [2] we observe a 35 MiB reduction in generated code. The difference is much more significant prior to recent minmax fixes which were not backported. As per [1] prior these the reduction is more like 200 MiB. This resolves an issue with slackware 15.0 32-bit compilation as reported by Richard Narron. Presumably the min/max fixups would be difficult to backport, this series should be easier and fix's Richard's problem in 5.15. [0]:https://lore.kernel.org/all/b97faef60ad24922b530241c5d7c933c@AcuMS.aculab.com/ [1]:https://lore.kernel.org/lkml/5882b96e-1287-4390-8174-3316d39038ef@lucifer.local/ [2]:https://lore.kernel.org/linux-mm/36aa2cad-1db1-4abf-8dd2-fb20484aabc3@lucifer.local/ v2: * Split into separate patches to make backporting easier. * Corrected type in sDIGIT_FITTING() argument. * Added reviewed-by tags. v1: https://lore.kernel.org/all/20240911153457.1005227-1-lorenzo.stoakes@oracle.com/ Lorenzo Stoakes (3): minmax: reduce min/max macro expansion in mvpp2 driver minmax: reduce min/max macro expansion in skbuff minmax: reduce min/max macro expansion in atomisp driver drivers/net/ethernet/marvell/mvpp2/mvpp2.h | 2 +- .../staging/media/atomisp/pci/sh_css_frac.h | 26 ++++++++++++++----- include/linux/skbuff.h | 6 ++++- 3 files changed, 25 insertions(+), 9 deletions(-) --- 2.46.0