• Chandra Seetharaman's avatar
    [PATCH] Process Events: Fix biarch compatibility issue. use __u64 timestamp · 822cfbff
    Chandra Seetharaman authored
    Events sent by Process Events Connector from a 64-bit kernel are not binary
    compatible with a 32-bit userspace program because the "timestamp" field
    (struct timespec) is not arch independent.  This affects the fields that
    follow "timestamp" as they will be be off by 8 bytes.
    
    This is a problem for 32-bit userspace programs running with 64-bit kernels
    on ppc64, s390, x86-64..  any "biarch" system.
    
    Matt had submitted a different solution to lkml as an RFC earlier.  We have
    since switched to a solution recommended by Evgeniy Polyakov.
    
    This patch fixes the problem by changing the timestamp to be a __u64, which
    stores the number of nanoseconds.
    
    Tested on a x86_64 system with both 32 bit application and 64 bit
    application and on a i386 system.
    Signed-off-by: default avatarChandra Seetharaman <sekharan@us.ibm.com>
    Signed-off-by: default avatarMatt Helsley <matthltc@us.ibm.com>
    Cc: Evgeniy Polyakov <johnpol@2ka.mipt.ru>
    Cc: Guillaume Thouvenin <guillaume.thouvenin@bull.net>
    Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
    Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
    822cfbff
cn_proc.c 6.6 KB