Messages in this thread | | | From | Charlemagne Lasse <> | Date | Tue, 2 Apr 2024 09:56:24 +0200 | Subject | Re: warning: cast removes address space '__percpu' of expression |
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Am Mo., 1. Apr. 2024 um 21:16 Uhr schrieb Uros Bizjak <ubizjak@gmail.com>: > > I would even go as far as saying that 1ca3683cc6d2 ("x86/percpu: > > Enable named address spaces with known compiler version") together > > with 3a1d3829e193 ("x86/percpu: Avoid sparse warning with cast to > > named address space") triggered this problem
I think 1ca3683cc6d2 was wrong and is the last working one.
Just switch to 1ca3683cc6d2c2ce4204df519c4e4730d037905a and you won't see the messages.
``` git reset --hard 1ca3683cc6d2c2ce4204df519c4e4730d037905a git clean -dfx make allnoconfig -j$(nproc) make kvm_guest.config make prepare -j$(nproc) touch include/linux/netdevice.h make C=1 net/core/dev.o CHECK="sparse -Wcast-from-as" ```
Go to 9a462b9eafa6dda16ea8429b151edb1fb535d744 and cherry-pick 3a1d3829e193c091475ceab481c5f8deab385023 and you would see the error. On amd64 with 12.2.0, this would look like this:
``` git reset --hard 9a462b9eafa6dda16ea8429b151edb1fb535d744 git cherry-pick 3a1d3829e193c091475ceab481c5f8deab385023 git clean -dfx make allnoconfig -j$(nproc) make kvm_guest.config make prepare -j$(nproc) touch include/linux/netdevice.h make C=1 net/core/dev.o CHECK="sparse -Wcast-from-as" ```
I would recommend to use `-Wsparse-all` for testing but for this demonstration, it is easier to use `-Wcast-from-as` to reduce the amount of noise in the demonstrator.
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