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

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Date:   Tue, 20 Dec 2022 18:57:49 +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 18:53, Peter Oberparleiter wrote:
> 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?

Oh, I forgot to add Martin's R-B from the v1 review (see [1]), so please
include:

Reviewed-By: Martin Liska <mliska@...e.cz>

https://lore.kernel.org/lkml/20221219150621.3310033-1-rickaran@axis.com/t/#mc2625879466e8af245cbebcc99acc4b8dd0b8cdc

> 
>> ---
>>  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