torvalds/linux@09022bc196d2 removes the flag, and the corresponding SetPageError() and ClearPageError() macros, with no replacement offered. Going back through the upstream history, use of this flag has been gradually removed over the last year as part of the long tail of converting everything to folios. Interesting tidbit comments from torvalds/linux@29e9412b250e and torvalds/linux@420e05d0de18 suggest that this flag has not been used meaningfully since page writeback failures started being recorded in errseq_t instead (the whole "fsyncgate" thing, ~2017, around torvalds/linux@8ed1e46aaf1b). Given that, it's possible that since perhaps Linux 4.13 we haven't been getting anything by setting the flag. I don't know if that's true and/or if there's something we should be doing instead, but my gut feel is that its probably fine we only use the page cache as a proxy to allow mmap() to work, rather than backing IO with it. As such, I'm expecting that removing this will do no harm, but I'm leaving it in for older kernels to maintain status quo, and if there is an overall better way, that is left for a future change. Sponsored-by: https://despairlabs.com/sponsor/ Signed-off-by: Rob Norris <robn@despairlabs.com>

Commits

Commits on Sep 29, 2024

Linux 6.12: avoid kmem_cache_create redefinition

Linux 6.12: support 3arg dequeue_signal() without task param

Linux 6.12: FMODE_UNSIGNED_OFFSET is now FOP_UNSIGNED_OFFSET

Commits on Sep 30, 2024

Linux 6.12: f_version removed from struct file

Linux 6.12: PG_error flag was removed