Messages in this thread |  | | Subject | Re: [PATCH 1/9] kernel: add a PF_FORCE_COMPAT flag | From | Pavel Begunkov <> | Date | Mon, 21 Sep 2020 19:20:42 +0300 |
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On 20/09/2020 18:55, William Kucharski wrote: > I really like that as it’s self-documenting and anyone debugging it can see what is actually being used at a glance.
Also creates special cases for things that few people care about, and makes it a pain for cross-platform (cross-bitness) development.
> >> On Sep 20, 2020, at 09:15, Matthew Wilcox <willy@infradead.org> wrote: >> >> On Fri, Sep 18, 2020 at 02:45:25PM +0200, Christoph Hellwig wrote: >>> Add a flag to force processing a syscall as a compat syscall. This is >>> required so that in_compat_syscall() works for I/O submitted by io_uring >>> helper threads on behalf of compat syscalls. >> >> Al doesn't like this much, but my suggestion is to introduce two new >> opcodes -- IORING_OP_READV32 and IORING_OP_WRITEV32. The compat code >> can translate IORING_OP_READV to IORING_OP_READV32 and then the core >> code can know what that user pointer is pointing to.
-- Pavel Begunkov
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