From: Reinette Chatre <reinette.chatre@intel.com>
To: "Ilpo Järvinen" <ilpo.jarvinen@linux.intel.com>,
linux-kselftest@vger.kernel.org, "Shuah Khan" <shuah@kernel.org>,
"Shaopeng Tan" <tan.shaopeng@jp.fujitsu.com>,
"Maciej Wieczór-Retman" <maciej.wieczor-retman@intel.com>,
"Fenghua Yu" <fenghua.yu@intel.com>
Cc: <linux-kernel@vger.kernel.org>
Subject: Re: [PATCH v3 09/29] selftests/resctrl: Create cache_portion_size() helper
Date: Wed, 13 Dec 2023 13:56:02 -0800 [thread overview]
Message-ID: <0d6cff29-9cda-4501-a29b-48e76fe2a9d8@intel.com> (raw)
In-Reply-To: <20231211121826.14392-10-ilpo.jarvinen@linux.intel.com>
Hi Ilpo,
On 12/11/2023 4:18 AM, Ilpo Järvinen wrote:
> +/*
> + * cache_portion_size - Calculate the size of a cache portion
> + * @cache_size: Total cache size in bytes
> + * @portion_mask: Cache portion mask
> + * @full_cache_mask: Full Cache Bit Mask (CBM) for the cache
> + *
> + * Return: The size of the cache portion in bytes.
> + */
> +static inline int cache_portion_size(unsigned long cache_size,
> + unsigned long portion_mask,
> + unsigned long full_cache_mask)
> +{
> + return cache_size * count_bits(portion_mask) / count_bits(full_cache_mask);
> +}
> +
Even after you added the new zero check the static checker I tried
was not able to recognize that this is safe. Could you please add a check
to ensure that there will be no divide-by-zero here?
Reinette
next prev parent reply other threads:[~2023-12-13 21:56 UTC|newest]
Thread overview: 49+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-12-11 12:17 [PATCH v3 00/29] selftests/resctrl: CAT test improvements & generalized test framework Ilpo Järvinen
2023-12-11 12:17 ` [PATCH v3 01/29] selftests/resctrl: Convert perror() to ksft_perror() or ksft_print_msg() Ilpo Järvinen
2023-12-13 21:53 ` Reinette Chatre
2023-12-14 10:12 ` Ilpo Järvinen
2023-12-14 18:10 ` Reinette Chatre
2023-12-11 12:17 ` [PATCH v3 02/29] selftests/resctrl: Return -1 instead of errno on error Ilpo Järvinen
2023-12-13 21:54 ` Reinette Chatre
2023-12-11 12:18 ` [PATCH v3 03/29] selftests/resctrl: Don't use ctrlc_handler() outside signal handling Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 04/29] selftests/resctrl: Change function comments to say < 0 on error Ilpo Järvinen
2023-12-13 21:54 ` Reinette Chatre
2023-12-11 12:18 ` [PATCH v3 05/29] selftests/resctrl: Split fill_buf to allow tests finer-grained control Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 06/29] selftests/resctrl: Refactor fill_buf functions Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 07/29] selftests/resctrl: Refactor get_cbm_mask() and rename to get_full_cbm() Ilpo Järvinen
2023-12-13 21:55 ` Reinette Chatre
2023-12-14 10:14 ` Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 08/29] selftests/resctrl: Mark get_cache_size() cache_type const Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 09/29] selftests/resctrl: Create cache_portion_size() helper Ilpo Järvinen
2023-12-13 21:56 ` Reinette Chatre [this message]
2023-12-14 10:16 ` Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 10/29] selftests/resctrl: Exclude shareable bits from schemata in CAT test Ilpo Järvinen
2023-12-13 21:56 ` Reinette Chatre
2023-12-11 12:18 ` [PATCH v3 11/29] selftests/resctrl: Split measure_cache_vals() Ilpo Järvinen
2023-12-13 21:56 ` Reinette Chatre
2023-12-11 12:18 ` [PATCH v3 12/29] selftests/resctrl: Split show_cache_info() to test specific and generic parts Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 13/29] selftests/resctrl: Remove unnecessary __u64 -> unsigned long conversion Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 14/29] selftests/resctrl: Remove nested calls in perf event handling Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 15/29] selftests/resctrl: Consolidate naming of perf event related things Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 16/29] selftests/resctrl: Improve perf init Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 17/29] selftests/resctrl: Convert perf related globals to locals Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 18/29] selftests/resctrl: Move cat_val() to cat_test.c and rename to cat_test() Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 19/29] selftests/resctrl: Open perf fd before start & add error handling Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 20/29] selftests/resctrl: Replace file write with volatile variable Ilpo Järvinen
2023-12-13 21:56 ` Reinette Chatre
2023-12-11 12:18 ` [PATCH v3 21/29] selftests/resctrl: Read in less obvious order to defeat prefetch optimizations Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 22/29] selftests/resctrl: Rewrite Cache Allocation Technology (CAT) test Ilpo Järvinen
2023-12-13 21:56 ` Reinette Chatre
2023-12-11 12:18 ` [PATCH v3 23/29] selftests/resctrl: Restore the CPU affinity after CAT test Ilpo Järvinen
2023-12-13 21:59 ` Reinette Chatre
2023-12-14 10:25 ` Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 24/29] selftests/resctrl: Create struct for input parameters Ilpo Järvinen
2023-12-13 21:59 ` Reinette Chatre
2023-12-11 12:18 ` [PATCH v3 25/29] selftests/resctrl: Introduce generalized test framework Ilpo Järvinen
2023-12-13 22:00 ` Reinette Chatre
2023-12-11 12:18 ` [PATCH v3 26/29] selftests/resctrl: Pass write_schemata() resource instead of test name Ilpo Järvinen
2023-12-11 12:18 ` [PATCH v3 27/29] selftests/resctrl: Add helper to convert L2/3 to integer Ilpo Järvinen
2023-12-13 22:00 ` Reinette Chatre
2023-12-11 12:18 ` [PATCH v3 28/29] selftests/resctrl: Rename resource ID to domain ID Ilpo Järvinen
2023-12-13 22:01 ` Reinette Chatre
2023-12-11 12:18 ` [PATCH v3 29/29] selftests/resctrl: Get domain id from cache id Ilpo Järvinen
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