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Since libspe2 will provide a function that can read/write multiple mailbox elements at once, the kernel should handle that efficiently. read/write on the three mailbox files can now access the spe context multiple times to operate on any number of mailbox data elements. If the spu application keeps writing to its outbound mailbox, the read call will pick up all the data in a single system call. Unfortunately, if the user passes an invalid pointer, we may lose a mailbox element on read, since we can't put it back. This probably impossible to solve, if the user also accesses the mailbox through direct register access. Signed-off-by: Arnd Bergmann <arnd.bergmann@de.ibm.com> Signed-off-by: Paul Mackerras <paulus@samba.org> |
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| apus | ||
| cell | ||
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| iseries | ||
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