linux-kernel - Re: [PATCH 5.4.y] Revert "ia64: kprobes: Use generic kretprobe trampoline handler"

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Date:   Fri, 14 Jan 2022 12:00:00 +0100
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     Masami Hiramatsu <mhiramat@...nel.org>
Cc:     stable@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ingo Molnar <mingo@...nel.org>, Sasha Levin <sashal@...nel.org>
Subject: Re: [PATCH 5.4.y] Revert "ia64: kprobes: Use generic kretprobe
 trampoline handler"

On Fri, Jan 14, 2022 at 07:19:59PM +0900, Masami Hiramatsu wrote:
> This reverts commit 77fa5e15c933a1ec812de61ad709c00aa51e96ae.
> 
> Since the upstream commit e792ff804f49720ce003b3e4c618b5d996256a18
> depends on the generic kretprobe trampoline handler, which was
> introduced by commit 66ada2ccae4e ("kprobes: Add generic kretprobe
> trampoline handler") but that is not ported to the stable kernel
> because it is not a bugfix series.
> So revert this commit to fix a build error.
> 
> NOTE: I keep commit a7fe2378454c ("ia64: kprobes: Fix to pass
> correct trampoline address to the handler") on the tree, that seems
> just a cleanup without the original reverted commit, but it would
> be better to use dereference_function_descriptor() macro instead
> of accessing descriptor's field directly.
> 
> 
> Fixes: 77fa5e15c933 ("ia64: kprobes: Use generic kretprobe trampoline handler")
> Reported-by: kernel test robot <lkp@...el.com>
> Signed-off-by: Masami Hiramatsu <mhiramat@...nel.org>
> ---
>  arch/ia64/kernel/kprobes.c |   78 ++++++++++++++++++++++++++++++++++++++++++--
>  1 file changed, 75 insertions(+), 3 deletions(-)

Thanks for this, I'll queue it up after this round of stable releases
are out.

greg k-h