Re: [PATCH] IB/rxe: avoid putting a large struct rxe_qp on stack

[Leon Romanovsky]

On Mon, Sep 19, 2016 at 01:57:26PM +0200, Arnd Bergmann wrote:
> A race condition fix added an rxe_qp structure to the stack in order
> to be able to perform rollback in rxe_requester(), but the structure
> is large enough to trigger the warning for possible stack overflow:
>
> drivers/infiniband/sw/rxe/rxe_req.c: In function 'rxe_requester':
> drivers/infiniband/sw/rxe/rxe_req.c:757:1: error: the frame size of 2064 bytes is larger than 1024 bytes [-Werror=frame-larger-than=]
>
> This changes the rollback function to only save the psn inside
> the qp, which is the only field we access in the rollback_qp
> anyway.
>
> Fixes: 3050b9985024 ("IB/rxe: Fix race condition between requester and completer")
> Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>

Thanks Arnd,
It is much cleaner approach.
Reviewed-by: Leon Romanovsky <leonro@xxxxxxxxxxxx>

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