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Date: Tue, 15 Mar 2016 22:34:59 +0100 From: Michal Marek <mmarek@...e.com> To: Ingo Molnar <mingo@...nel.org> Cc: Thomas Gleixner <tglx@...utronix.de>, Daniel Wagner <wagi@...om.org>, linux-kbuild@...r.kernel.org, linux-kernel@...r.kernel.org, Ingo Molnar <mingo@...hat.com>, Daniel Wagner <daniel.wagner@...-carit.de> Subject: Re: [PATCH] kbuild: Add option to turn incompatible pointer check into error Dne 8.3.2016 v 10:19 Ingo Molnar napsal(a): > > * Thomas Gleixner <tglx@...utronix.de> wrote: > >> On Tue, 8 Mar 2016, Daniel Wagner wrote: >> >>> From: Daniel Wagner <daniel.wagner@...-carit.de> >>> >>> With the introduction of the simple wait API we have two very >>> similar APIs in the kernel. For example wake_up() and swake_up() >>> is only one character away. Although the compiler will warn >>> happily the wrong usage it keeps on going an even links the kernel. >>> Thomas and Peter would rather like to see early missuses reported >>> as error early on. >>> >>> In a first attempt we tried to wrap all swait and wait calls >>> into a macro which has an compile time type assertion. The result >>> was pretty ugly and wasn't able to catch all wrong usages. >>> woken_wake_function(), autoremove_wake_function() and wake_bit_function() >>> are assigned as function pointers. Wrapping them with a macro around is >>> not possible. Prefixing them with '_' was also not a real option >>> because there some users in the kernel which do use them as well. >>> All in all this attempt looked to intrusive and too ugly. >>> >>> An alternative is to turn the pointer type check into an error which >>> catches wrong type uses. Obviously not only the swait/wait ones. That >>> isn't a bad thing either. >>> >>> Signed-off-by: Daniel Wagner <daniel.wagner@...-carit.de> >>> Acked-by: Peter Zijlstra (Intel) <peterz@...radead.org> >>> Cc: Thomas Gleixner <tglx@...utronix.de> >> >> Acked-by: Thomas Gleixner <tglx@...utronix.de> Applied to kbuild.git#kbuild. > > Note that there will be a few build failures triggered by this, for example this > fix from linux-next is needed: > >> commit db9b60400f9253c25ae639797df2d0ff7a35d9d8 >> Author: Sudip Mukherjee <sudipm.mukherjee@...il.com> >> Date: Tue Feb 2 11:35:55 2016 +0530 >> >> drm/gma500: remove helper function OK. I will send a pull request to Linus only after at least x86_64/allyescofnig is fixed. Michal
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