davidlt/kernel-ark
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity
16bf288c4b
kernel-ark/drivers/block
History
Hitoshi Mitake 797a796a13 asm-generic: architecture independent readq/writeq for 32bit environment 
This provides unified readq()/writeq() helper functions for 32-bit
drivers.

For some cases, readq/writeq without atomicity is harmful, and order of
io access has to be specified explicitly.  So in this patch, new two
header files which contain non-atomic readq/writeq are added.

 - <asm-generic/io-64-nonatomic-lo-hi.h> provides non-atomic readq/
   writeq with the order of lower address -> higher address

 - <asm-generic/io-64-nonatomic-hi-lo.h> provides non-atomic readq/
   writeq with reversed order

This allows us to remove some readq()s that were added drivers when the
default non-atomic ones were removed in commit dbee8a0aff ("x86:
remove 32-bit versions of readq()/writeq()")

The drivers which need readq/writeq but can do with the non-atomic ones
must add the line:

  #include <asm-generic/io-64-nonatomic-lo-hi.h> /* or hi-lo.h */

But this will be nop in 64-bit environments, and no other #ifdefs are
required.  So I believe that this patch can solve the problem of
 1. driver-specific readq/writeq
 2. atomicity and order of io access

This patch is tested with building allyesconfig and allmodconfig as
ARCH=x86 and ARCH=i386 on top of tip/master.

Cc: Kashyap Desai <Kashyap.Desai@lsi.com>
Cc: Len Brown <lenb@kernel.org>
Cc: Ravi Anand <ravi.anand@qlogic.com>
Cc: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Cc: Matthew Garrett <mjg@redhat.com>
Cc: Jason Uhlenkott <juhlenko@akamai.com>
Cc: James Bottomley <James.Bottomley@parallels.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Roland Dreier <roland@purestorage.com>
Cc: James Bottomley <jbottomley@parallels.com>
Cc: Alan Cox <alan@lxorguk.ukuu.org.uk>
Cc: Matthew Wilcox <matthew.r.wilcox@intel.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Hitoshi Mitake <h.mitake@gmail.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2012-02-21 16:47:28 -08:00
..
aoe
drbd
mtip32xx mtip32xx: removed the irrelevant argument of mtip_hw_submit_io() and the unused member of struct driver_data 2012-02-07 07:54:31 +01:00
paride paride/pcd: fix bool verbose module parameter. 2012-01-13 09:32:26 +10:30
xen-blkback Merge branch 'for-3.3/drivers' of git://git.kernel.dk/linux-block 2012-01-15 12:48:41 -08:00
amiflop.c
ataflop.c
brd.c
cciss_cmd.h
cciss_scsi.c
cciss_scsi.h
cciss.c block: add and use scsi_blk_cmd_ioctl 2012-01-14 15:07:24 -08:00
cciss.h
cpqarray.c
cpqarray.h
cryptoloop.c
DAC960.c
DAC960.h
floppy.c floppy: Fix a crash during rmmod 2012-02-08 20:03:39 +01:00
hd.c
ida_cmd.h
ida_ioctl.h
Kconfig Merge git://git.infradead.org/users/willy/linux-nvme 2012-01-18 12:34:09 -08:00
loop.c loop: zero fill bio instead of return -EIO for partial read 2012-02-08 22:07:19 +01:00
Makefile Merge git://git.infradead.org/users/willy/linux-nvme 2012-01-18 12:34:09 -08:00
mg_disk.c
nbd.c
nvme.c asm-generic: architecture independent readq/writeq for 32bit environment 2012-02-21 16:47:28 -08:00
osdblk.c
pktcdvd.c
ps3disk.c
ps3vram.c
rbd_types.h
rbd.c Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/sage/ceph-client 2012-02-02 15:47:33 -08:00
smart1,2.h
sunvdc.c
swim3.c
swim_asm.S
swim.c
sx8.c
ub.c block: add and use scsi_blk_cmd_ioctl 2012-01-14 15:07:24 -08:00
umem.c
umem.h
viodasd.c
virtio_blk.c block: add and use scsi_blk_cmd_ioctl 2012-01-14 15:07:24 -08:00
xd.c
xd.h
xen-blkfront.c Merge branch 'for-3.3/drivers' of git://git.kernel.dk/linux-block 2012-01-15 12:48:41 -08:00
xsysace.c
z2ram.c