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Re: [XEN PATCH 2/4] x86/hvm: address violations of MISRA C Rule 20.7
- To: Stefano Stabellini <sstabellini@xxxxxxxxxx>, Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Tue, 21 May 2024 13:24:26 +0200
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- Cc: xen-devel@xxxxxxxxxxxxxxxxxxxx, michal.orzel@xxxxxxx, xenia.ragiadakou@xxxxxxx, ayan.kumar.halder@xxxxxxx, consulting@xxxxxxxxxxx, Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>
- Delivery-date: Tue, 21 May 2024 11:24:35 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 16.05.2024 01:18, Stefano Stabellini wrote:
> On Wed, 15 May 2024, Nicola Vetrini wrote:
>> MISRA C Rule 20.7 states: "Expressions resulting from the expansion
>> of macro parameters shall be enclosed in parentheses". Therefore, some
>> macro definitions should gain additional parentheses to ensure that all
>> current and future users will be safe with respect to expansions that
>> can possibly alter the semantics of the passed-in macro parameter.
>>
>> No functional change.
>>
>> Signed-off-by: Nicola Vetrini <nicola.vetrini@xxxxxxxxxxx>
>
> Reviewed-by: Stefano Stabellini <sstabellini@xxxxxxxxxx>
>
>
>> ---
>> xen/arch/x86/hvm/mtrr.c | 2 +-
>> xen/arch/x86/hvm/rtc.c | 2 +-
>> xen/arch/x86/include/asm/hvm/save.h | 2 +-
>> 3 files changed, 3 insertions(+), 3 deletions(-)
>>
>> diff --git a/xen/arch/x86/hvm/mtrr.c b/xen/arch/x86/hvm/mtrr.c
>> index 32f74c1db03b..1079851f70ed 100644
>> --- a/xen/arch/x86/hvm/mtrr.c
>> +++ b/xen/arch/x86/hvm/mtrr.c
>> @@ -16,7 +16,7 @@
>> #include <public/hvm/e820.h>
>>
>> /* Get page attribute fields (PAn) from PAT MSR. */
>> -#define pat_cr_2_paf(pat_cr,n) ((((uint64_t)pat_cr) >> ((n)<<3)) & 0xff)
>> +#define pat_cr_2_paf(pat_cr, n) ((((uint64_t)(pat_cr)) >> ((n) << 3)) &
>> 0xff)
>
> just a cosmetic change
Not really, as Nicola already pointed out. However, there's an excess pair of
parentheses which better would have been re-arranged rather than adding yet
another pair:
#define pat_cr_2_paf(pat_cr, n) (((uint64_t)(pat_cr) >> ((n) << 3)) & 0xff)
Preferably with that (which I'll likely take the liberty of adjusting while
committing)
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
Jan
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