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block: kill bio_kmap/kunmap_irq() 

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Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
hifive-unleashed-5.1
Jens Axboe 2017-11-08 11:15:37 -07:00
parent 05b7941394
commit 83f5f7ed72
2 changed files with 2 additions and 13 deletions
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4
Documentation/block/biodoc.txt
View File

@ -216,7 +216,7 @@ may need to abort DMA operations and revert to PIO for the transfer, in
which case a virtual mapping of the page is required. For SCSI it is also which case a virtual mapping of the page is required. For SCSI it is also
done in some scenarios where the low level driver cannot be trusted to done in some scenarios where the low level driver cannot be trusted to
handle a single sg entry correctly. The driver is expected to perform the handle a single sg entry correctly. The driver is expected to perform the
kmaps as needed on such occasions using the __bio_kmap_atomic and bio_kmap_irq kmaps as needed on such occasions using the bio_kmap_irq and friends
routines as appropriate. A driver could also use the blk_queue_bounce() routines as appropriate. A driver could also use the blk_queue_bounce()
routine on its own to bounce highmem i/o to low memory for specific requests routine on its own to bounce highmem i/o to low memory for specific requests
if so desired. if so desired.
@ -1137,7 +1137,7 @@ use dma_map_sg for scatter gather) to be able to ship it to the driver. For
PIO drivers (or drivers that need to revert to PIO transfer once in a PIO drivers (or drivers that need to revert to PIO transfer once in a
while (IDE for example)), where the CPU is doing the actual data while (IDE for example)), where the CPU is doing the actual data
transfer a virtual mapping is needed. If the driver supports highmem I/O, transfer a virtual mapping is needed. If the driver supports highmem I/O,
(Sec 1.1, (ii) ) it needs to use __bio_kmap_atomic and bio_kmap_irq to (Sec 1.1, (ii) ) it needs to use __bio_kmap_atomic or similar to
temporarily map a bio into the virtual address space. temporarily map a bio into the virtual address space.

11
include/linux/bio.h
View File

@ -573,17 +573,6 @@ static inline void bvec_kunmap_irq(char *buffer, unsigned long *flags)
} }
#endif #endif
static inline char *__bio_kmap_irq(struct bio *bio, struct bvec_iter iter,
unsigned long *flags)
{
return bvec_kmap_irq(&bio_iter_iovec(bio, iter), flags);
}
#define __bio_kunmap_irq(buf, flags) bvec_kunmap_irq(buf, flags)
#define bio_kmap_irq(bio, flags) \
__bio_kmap_irq((bio), (bio)->bi_iter, (flags))
#define bio_kunmap_irq(buf,flags) __bio_kunmap_irq(buf, flags)
/* /*
* BIO list management for use by remapping drivers (e.g. DM or MD) and loop. * BIO list management for use by remapping drivers (e.g. DM or MD) and loop.
* *