Messages in this thread | | | Date | Thu, 17 Sep 2020 15:34:11 +0200 | From | Oleg Nesterov <> | Subject | Re: [RFC PATCH] locking/percpu-rwsem: use this_cpu_{inc|dec}() for read_count |
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On 09/17, Matthew Wilcox wrote: > > On Thu, Sep 17, 2020 at 02:01:33PM +0200, Oleg Nesterov wrote: > > IIUC, file_end_write() was never IRQ safe (at least if !CONFIG_SMP), even > > before 8129ed2964 ("change sb_writers to use percpu_rw_semaphore"), but this > > doesn't matter... > > > > Perhaps we can change aio.c, io_uring.c and fs/overlayfs/file.c to avoid > > file_end_write() in IRQ context, but I am not sure it's worth the trouble. > > If we change bio_endio to invoke the ->bi_end_io callbacks in softirq
Not sure I understand...
How can this help? irq_exit() can invoke_softirq() -> __do_softirq() ?
Oleg.
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