rename RUSTCFLAGS to RUSTFLAGS #425
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Cargo uses `RUSTFLAGS` and `rustflags` while currently the name in Kbuild is `RUSTCFLAGS` and `rustcflags`. Rename the flags to be consistent with Rust ecosystem to reduce potential confusion in the future. Signed-off-by: Gary Guo <[email protected]>
Signed-off-by: Gary Guo <[email protected]>
ojeda
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dump_user_range() is used to copy the user page to a coredump file, but if a hardware memory error occurred during copy, which called from __kernel_write_iter() in dump_user_range(), it crashes, CPU: 112 PID: 7014 Comm: mca-recover Not tainted 6.3.0-rc2 #425 pc : __memcpy+0x110/0x260 lr : _copy_from_iter+0x3bc/0x4c8 ... Call trace: __memcpy+0x110/0x260 copy_page_from_iter+0xcc/0x130 pipe_write+0x164/0x6d8 __kernel_write_iter+0x9c/0x210 dump_user_range+0xc8/0x1d8 elf_core_dump+0x308/0x368 do_coredump+0x2e8/0xa40 get_signal+0x59c/0x788 do_signal+0x118/0x1f8 do_notify_resume+0xf0/0x280 el0_da+0x130/0x138 el0t_64_sync_handler+0x68/0xc0 el0t_64_sync+0x188/0x190 Generally, the '->write_iter' of file ops will use copy_page_from_iter() and copy_page_from_iter_atomic(), change memcpy() to copy_mc_to_kernel() in both of them to handle #MC during source read, which stop coredump processing and kill the task instead of kernel panic, but the source address may not always a user address, so introduce a new copy_mc flag in struct iov_iter{} to indicate that the iter could do a safe memory copy, also introduce the helpers to set/cleck the flag, for now, it's only used in coredump's dump_user_range(), but it could expand to any other scenarios to fix the similar issue. Link: https://lkml.kernel.org/r/[email protected] Signed-off-by: Kefeng Wang <[email protected]> Cc: Alexander Viro <[email protected]> Cc: Christian Brauner <[email protected]> Cc: Miaohe Lin <[email protected]> Cc: Naoya Horiguchi <[email protected]> Cc: Tong Tiangen <[email protected]> Cc: Jens Axboe <[email protected]> Signed-off-by: Andrew Morton <[email protected]>
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Cargo uses
RUSTFLAGSandrustflagswhile currently the name inKbuild is
RUSTCFLAGSandrustcflags. Rename the flags to beconsistent with Rust ecosystem to reduce potential confusion in the
future.
I think it's important to have this changed before the next LKML drop.
Fixes #327