• Sebastian Ott's avatar
    [S390] chsc: consolidate memory allocations · 34196f82
    Sebastian Ott authored
    Most wrappers around the channel subsystem call have their own logic
    to allocate memory (with proper alignment) or use preallocated or
    static memory. This patch converts most users of the channel
    subsystem call to use the same preallocated page (proteced by a
    spinlock).
    
    Note: The sei_page which is used in our crw handler to call
    "store event information" has to coexist, since
    a) in crw context, while accessing the sei_page, sleeping is allowed
       (which will conflict with the spinlock protection of the chsc_page)
    b) in crw context, while accessing the sei_page, channel subsystem
       calls are allowed (which itself would require the page).
    Signed-off-by: default avatarSebastian Ott <sebott@linux.vnet.ibm.com>
    Signed-off-by: default avatarMartin Schwidefsky <schwidefsky@de.ibm.com>
    34196f82
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