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Re: [PATCH 5/5] mm: add the __must_check attribute to {gfn,mfn}_add()
- To: Roger Pau Monne <roger.pau@xxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Wed, 14 Feb 2024 14:42:46 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, George Dunlap <george.dunlap@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Wei Liu <wl@xxxxxxx>, xen-devel@xxxxxxxxxxxxxxxxxxxx
- Delivery-date: Wed, 14 Feb 2024 13:42:57 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
On 14.02.2024 11:37, Roger Pau Monne wrote:
> It's not obvious from the function itself whether the incremented value will
> be
s/the function itself/just the function name/ ?
> stored in the parameter, or returned to the caller. That has leads to bugs in
> the past as callers assume the incremented value is stored in the parameter.
... callers may assume ... ?
> --- a/xen/include/xen/mm-frame.h
> +++ b/xen/include/xen/mm-frame.h
> @@ -23,7 +23,7 @@ TYPE_SAFE(unsigned long, mfn);
> #undef mfn_x
> #endif
>
> -static inline mfn_t mfn_add(mfn_t mfn, unsigned long i)
> +static inline mfn_t __must_check mfn_add(mfn_t mfn, unsigned long i)
> {
> return _mfn(mfn_x(mfn) + i);
> }
> @@ -62,7 +62,7 @@ TYPE_SAFE(unsigned long, gfn);
> #undef gfn_x
> #endif
>
> -static inline gfn_t gfn_add(gfn_t gfn, unsigned long i)
> +static inline gfn_t __must_check gfn_add(gfn_t gfn, unsigned long i)
> {
> return _gfn(gfn_x(gfn) + i);
> }
What about dfn_add() (in xen/iommu.h)?
Jan
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