Groups | Search | Server Info | Keyboard shortcuts | Login | Register [http] [https] [nntp] [nntps]
Groups > linux.kernel > #1612379
| From | Andrew Morton <akpm@linux-foundation.org> |
|---|---|
| Newsgroups | linux.kernel |
| Subject | Re: [PATCH] kernel.h: add IS_PTR_ALIGNED() macro |
| Date | 2017-03-29 23:40 +0200 |
| Message-ID | <tqttU-4o9-7@gated-at.bofh.it> (permalink) |
| References | <tqj1w-5wl-21@gated-at.bofh.it> |
| Organization | linux.* mail to news gateway |
On Wed, 29 Mar 2017 19:22:10 +0900 Masahiro Yamada <yamada.masahiro@socionext.com> wrote: > We often check if a pointer has a specific alignment. Because the > '&' (bitwise AND) operator cannot take a pointer for the operand, > so we need a cast like, IS_ALIGNED((unsigned long)p, a). > > IS_PTR_ALIGNED will be useful as a shorthand. > > ... > > --- a/include/linux/kernel.h > +++ b/include/linux/kernel.h > @@ -50,6 +50,7 @@ > #define __ALIGN_MASK(x, mask) __ALIGN_KERNEL_MASK((x), (mask)) > #define PTR_ALIGN(p, a) ((typeof(p))ALIGN((unsigned long)(p), (a))) > #define IS_ALIGNED(x, a) (((x) & ((typeof(x))(a) - 1)) == 0) > +#define IS_PTR_ALIGNED(p, a) (IS_ALIGNED((unsigned long)p, a)) > > /* generic data direction definitions */ > #define READ 0 It would be nice to see some conversions which actually use this new macro.
Back to linux.kernel | Previous | Next — Previous in thread | Next in thread | Find similar | Unroll thread
[PATCH] kernel.h: add IS_PTR_ALIGNED() macro Masahiro Yamada <yamada.masahiro@socionext.com> - 2017-03-29 12:30 +0200
Re: [PATCH] kernel.h: add IS_PTR_ALIGNED() macro Andrew Morton <akpm@linux-foundation.org> - 2017-03-29 23:40 +0200
Re: [PATCH] kernel.h: add IS_PTR_ALIGNED() macro "H. Peter Anvin" <hpa@zytor.com> - 2017-03-29 23:40 +0200
Re: [PATCH] kernel.h: add IS_PTR_ALIGNED() macro Masahiro Yamada <yamada.masahiro@socionext.com> - 2017-03-30 04:00 +0200
Re: [PATCH] kernel.h: add IS_PTR_ALIGNED() macro "H. Peter Anvin" <hpa@zytor.com> - 2017-03-30 05:50 +0200
Re: [PATCH] kernel.h: add IS_PTR_ALIGNED() macro Masahiro Yamada <yamada.masahiro@socionext.com> - 2017-03-30 17:30 +0200
csiph-web