__volatile__ __asm__

volatile is a C keyword, and programmers know better than using asm as an identifier. Why do people insist on using double underscores around them, especially Linux kernel developers?

Also, why do people use things like __attribute__((aligned(n))) instead of defining a macro ALIGNED(n)?

>>5
And why should one bother with defining a macro?
It looks better and it's shorter to type -- I write kernel code so it appears a lot.