linux-kernel - Re: [PATCH] drbd: fix function cast warnings in state machine

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Date: Tue, 13 Feb 2024 08:55:58 -0700
From: Jens Axboe <axboe@...nel.dk>
To: Philipp Reisner <philipp.reisner@...bit.com>, 
 Lars Ellenberg <lars.ellenberg@...bit.com>, 
 Christoph Böhmwalder <christoph.boehmwalder@...bit.com>, 
 Arnd Bergmann <arnd@...nel.org>
Cc: Arnd Bergmann <arnd@...db.de>, Nathan Chancellor <nathan@...nel.org>, 
 Nick Desaulniers <ndesaulniers@...gle.com>, 
 Bill Wendling <morbo@...gle.com>, Justin Stitt <justinstitt@...gle.com>, 
 "Uladzislau Rezki (Sony)" <urezki@...il.com>, drbd-dev@...ts.linbit.com, 
 linux-block@...r.kernel.org, linux-kernel@...r.kernel.org, 
 llvm@...ts.linux.dev
Subject: Re: [PATCH] drbd: fix function cast warnings in state machine


On Tue, 13 Feb 2024 11:03:01 +0100, Arnd Bergmann wrote:
> There are four state machines in drbd that use a common infrastructure, with
> a cast to an incompatible function type in REMEMBER_STATE_CHANGE that clang-16
> now warns about:
> 
> drivers/block/drbd/drbd_state.c:1632:3: error: cast from 'int (*)(struct sk_buff *, unsigned int, struct drbd_resource_state_change *, enum drbd_notification_type)' to 'typeof (last_func)' (aka 'int (*)(struct sk_buff *, unsigned int, void *, enum drbd_notification_type)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>  1632 |                 REMEMBER_STATE_CHANGE(notify_resource_state_change,
>       |                 ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  1633 |                                       resource_state_change, NOTIFY_CHANGE);
>       |                                       ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> drivers/block/drbd/drbd_state.c:1619:17: note: expanded from macro 'REMEMBER_STATE_CHANGE'
>  1619 |            last_func = (typeof(last_func))func; \
>       |                        ^~~~~~~~~~~~~~~~~~~~~~~
> drivers/block/drbd/drbd_state.c:1641:4: error: cast from 'int (*)(struct sk_buff *, unsigned int, struct drbd_connection_state_change *, enum drbd_notification_type)' to 'typeof (last_func)' (aka 'int (*)(struct sk_buff *, unsigned int, void *, enum drbd_notification_type)') converts to incompatible function type [-Werror,-Wcast-function-type-strict]
>  1641 |                         REMEMBER_STATE_CHANGE(notify_connection_state_change,
>       |                         ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
>  1642 |                                               connection_state_change, NOTIFY_CHANGE);
>       |                                               ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> 
> [...]

Applied, thanks!

[1/1] drbd: fix function cast warnings in state machine
      commit: fe0b1e9a73d60f01fdc391925be74e823af7c91d

Best regards,
-- 
Jens Axboe