Messages in this thread | | | From | Andi Kleen <> | Subject | Re: [PATCH 1/24] make atomic_read() behave consistently on alpha | Date | Fri, 10 Aug 2007 11:08:20 +0200 |
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On Friday 10 August 2007 10:21:46 Herbert Xu wrote: > Paul E. McKenney <paulmck@linux.vnet.ibm.com> wrote: > > > > The compiler is within its rights to read a 32-bit quantity 16 bits at > > at time, even on a 32-bit machine. I would be glad to help pummel any > > compiler writer that pulls such a dirty trick, but the C standard really > > does permit this. > > Code all over the kernel assumes that 32-bit reads/writes > are atomic so while such a compiler might be legal it certainly > can't compile Linux.
Yes, the kernel requirements are much stricter than ISO-C. And besides it is a heavy user of C extensions anyways. On the other hand some of the C99 extensions are not allowed. And then there is sparse, which enforces a language which sometimes is quite far from standard C. You could say it is written in Linux-C, not ISO C.
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