Re: [RFC] [PATCH 2/16] x86_64: Assembly safe page.h and pgtable.h

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]


Andi Kleen <[email protected]> writes:

>> I think we need these UL suffixes. Otherwise in some cases overflow
>> can take place and compiler emits warning.
>> For ex. in following definition I got rid of UL.
>> #define PGDIR_SIZE      (1 << PGDIR_SHIFT) 
> Yes for the shifts it is needed, but not for the unshifted constants.
> I think. At least when they're hex the compiler should chose the right
> type on its own.

Only if the high bit is set.  But it should chose a big enough type.
However there is no reason to play games and possibly out smart ourselves.
That is the point of the _AC() macro.  It adds the suffix only for
C code, and drops it for assembly.

To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at
Please read the FAQ at

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux