lkml.org 
[lkml]   [1998]   [Dec]   [16]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
    /
    From
    Date
    SubjectRe: [PATCH] 2.1.131: i386 tweak to switch_to()
     > 
    > "cc" is condition flags; "memory" is clobbered each time you write to
    > something that is not in the arguments. Clobbering "memory" is used to
    > singal gcc that it can't assume that memory is unchanged (i.e., reuse a
    > value in memory that just happens to be in a register), and also has the
    > side effect that it acts as a barrier: No reordering of instructions will
    > move stuff over the asm() because of the above.


    further , memory as the cloberred operand means all registers are
    assumed cloberred and their contents are assumed to be unreliable .



    -
    To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
    the body of a message to majordomo@vger.rutgers.edu
    Please read the FAQ at http://www.tux.org/lkml/

    \
     
     \ /
      Last update: 2005-03-22 13:46    [W:0.019 / U:0.128 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site