the relative rarity of "downgrade_write()"

["Robert P. J. Day" <rpjday@xxxxxxxxxxxxxx>]

  i'm amused by the rarity of the RW semaphore routine
"downgrade_write()":

$ grep -rw downgrade_write .
./drivers/infiniband/core/user_mad.c:   downgrade_write(&file->port->mutex);
./drivers/infiniband/core/user_mad.c:           downgrade_write(&port->mutex);
./kernel/rwsem.c:void downgrade_write(struct rw_semaphore *sem)
./kernel/rwsem.c:EXPORT_SYMBOL(downgrade_write);
./arch/powerpc/platforms/cell/spufs/context.c:  downgrade_write(&ctx->state_sema);
./arch/powerpc/platforms/cell/spufs/context.c:  downgrade_write(&ctx->state_sema);
./include/linux/rwsem.h:extern void downgrade_write(struct rw_semaphore *sem);
./fs/xfs/linux-2.6/mrlock.h:    downgrade_write(&mrp->mr_lock);
$

  that's not a lot of actual invocations.  essentially, two source
files and a header file.  just an observation.

rday

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Robert P. J. Day
Linux Consulting, Training and Annoying Kernel Pedantry
Waterloo, Ontario, CANADA

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