Re: [PATCH 1/9] kernel: add a PF_FORCE_COMPAT flag
flat view
From: Pavel Begunkov <asml.silence@gmail.com>
Date: 2020-09-21 16:23:25
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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.
quoted
On Sep 20, 2020, at 09:15, Matthew Wilcox [off-list ref] wrote: On Fri, Sep 18, 2020 at 02:45:25PM +0200, Christoph Hellwig wrote:quoted
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 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel