linux-kernel - Re: [PATCH v2] gcov: Add support for checksum field

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Date:   Tue, 20 Dec 2022 18:53:53 +0100
From:   Peter Oberparleiter <oberpar@...ux.ibm.com>
To:     Rickard Andersson <rickaran@...s.com>,
        Andrew Morton <akpm@...ux-foundation.org>
Cc:     rickard314.andersson@...il.com, mliska@...e.cz,
        Jesper.Nilsson@...s.com, stable@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] gcov: Add support for checksum field

On 20.12.2022 11:23, Rickard Andersson wrote:
> From: Rickard x Andersson <rickaran@...s.com>
> 
> In GCC version 12.1 a checksum field was added.
> 
> This patch fixes a kernel crash occurring during boot when
> using gcov-kernel with GCC version 12.2. The crash occurred on
> a system running on i.MX6SX.
> 
> Fixes: 977ef30a7d88 ("gcov: support GCC 12.1 and newer compilers")
> Signed-off-by: Rickard x Andersson <rickaran@...s.com>
> Reviewed-by: Peter Oberparleiter <oberpar@...ux.ibm.com>
> Tested-by: Peter Oberparleiter <oberpar@...ux.ibm.com>
> Cc: <stable@...r.kernel.org>

Thank you for the fix!

Andrew, could you pick this up via your tree?

> ---
>  kernel/gcov/gcc_4_7.c | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/kernel/gcov/gcc_4_7.c b/kernel/gcov/gcc_4_7.c
> index c699feda21ac..04880d8fba25 100644
> --- a/kernel/gcov/gcc_4_7.c
> +++ b/kernel/gcov/gcc_4_7.c
> @@ -85,6 +85,7 @@ struct gcov_fn_info {
>   * @version: gcov version magic indicating the gcc version used for compilation
>   * @next: list head for a singly-linked list
>   * @stamp: uniquifying time stamp
> + * @checksum: unique object checksum
>   * @filename: name of the associated gcov data file
>   * @merge: merge functions (null for unused counter type)
>   * @n_functions: number of instrumented functions
> @@ -97,6 +98,10 @@ struct gcov_info {
>  	unsigned int version;
>  	struct gcov_info *next;
>  	unsigned int stamp;
> + /* Since GCC 12.1 a checksum field is added. */
> +#if (__GNUC__ >= 12)
> +	unsigned int checksum;
> +#endif
>  	const char *filename;
>  	void (*merge[GCOV_COUNTERS])(gcov_type *, unsigned int);
>  	unsigned int n_functions;

-- 
Peter Oberparleiter
Linux on IBM Z Development - IBM Germany R&D