Linus Torvalds
601cc11d05
Make non-compat preadv/pwritev use native register size ...
Instead of always splitting the file offset into 32-bit 'high' and 'low'
parts, just split them into the largest natural word-size - which in C
terms is 'unsigned long'.
This allows 64-bit architectures to avoid the unnecessary 32-bit
shifting and masking for native format (while the compat interfaces will
obviously always have to do it).
This also changes the order of 'high' and 'low' to be "low first". Why?
Because when we have it like this, the 64-bit system calls now don't use
the "pos_high" argument at all, and it makes more sense for the native
system call to simply match the user-mode prototype.
This results in a much more natural calling convention, and allows the
compiler to generate much more straightforward code. On x86-64, we now
generate
testq %rcx, %rcx # pos_l
js .L122 #,
movq %rcx, -48(%rbp) # pos_l, pos
from the C source
loff_t pos = pos_from_hilo(pos_h, pos_l);
...
if (pos < 0)
return -EINVAL;
and the 'pos_h' register isn't even touched. It used to generate code
like
mov %r8d, %r8d # pos_low, pos_low
salq $32, %rcx #, tmp71
movq %r8, %rax # pos_low, pos.386
orq %rcx, %rax # tmp71, pos.386
js .L122 #,
movq %rax, -48(%rbp) # pos.386, pos
which isn't _that_ horrible, but it does show how the natural word size
is just a more sensible interface (same arguments will hold in the user
level glibc wrapper function, of course, so the kernel side is just half
of the equation!)
Note: in all cases the user code wrapper can again be the same. You can
just do
#define HALF_BITS (sizeof(unsigned long)*4)
__syscall(PWRITEV, fd, iov, count, offset, (offset >> HALF_BITS) >> HALF_BITS);
or something like that. That way the user mode wrapper will also be
nicely passing in a zero (it won't actually have to do the shifts, the
compiler will understand what is going on) for the last argument.
And that is a good idea, even if nobody will necessarily ever care: if
we ever do move to a 128-bit lloff_t, this particular system call might
be left alone. Of course, that will be the least of our worries if we
really ever need to care, so this may not be worth really caring about.
[ Fixed for lost 'loff_t' cast noticed by Andrew Morton ]
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: linux-api@vger.kernel.org
Cc: linux-arch@vger.kernel.org
Cc: Ingo Molnar <mingo@elte.hu>
Cc: Ralf Baechle <ralf@linux-mips.org>>
Cc: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2009-04-04 14:20:34 -07:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/lrg/voltage-2.6
2009-04-03 10:39:20 -07:00
MMC: regulator utilities
2009-03-31 09:56:26 +01:00
Merge branch 'master' of git://git.kernel.org/pub/scm/linux/kernel/git/kaber/nf-next-2.6
2009-03-26 22:45:23 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
Merge branch 'header-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-26 16:11:41 -07:00
md/raid6: move raid6 data processing to raid6_pq.ko
2009-03-31 15:09:39 +11:00
regulator: Support disabling of unused regulators by machines
2009-03-31 09:56:29 +01:00
spi-gpio: allow operation without CS signal
2009-04-02 19:04:51 -07:00
SUNRPC: Remove @family argument from svc_create() and svc_create_pooled()
2009-03-28 15:54:48 -04:00
trivial: wusb: Storage class should be before const qualifier
2009-03-30 15:22:03 +02:00
wimax: struct device - replace bus_id with dev_name(), dev_set_name()
2009-03-24 16:38:23 -07:00
Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
2009-04-01 09:47:12 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
async_tx: provide __async_inline for HAS_DMA=n archs
2009-03-25 09:13:25 -07:00
Merge branch 'upstream-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jgarzik/libata-dev
2009-03-26 11:20:23 -07:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
autofs4: fix kernel includes
2009-04-01 08:59:23 -07:00
autofs4: fix kernel includes
2009-04-01 08:59:23 -07:00
struct linux_binprm: drop unused fields
2009-04-02 19:05:01 -07:00
block: add private bio_set for bio integrity allocations
2009-03-24 12:35:17 +01:00
mm: enable hashdist by default on 64bit NUMA
2009-04-01 08:59:14 -07:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
2009-03-28 13:30:43 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2009-04-02 21:09:10 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2009-04-03 15:24:35 -07:00
clkdev: add possibility to get a clock based on the device name
2009-03-27 14:51:13 +01:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
Make non-compat preadv/pwritev use native register size
2009-04-04 14:20:34 -07:00
compiler-gcc4: conditionalize #error on __KERNEL__
2009-03-26 18:14:23 +01:00
vcs: hook sysfs devices into object lifetime instead of "binding"
2009-03-24 16:38:26 -07:00
cpu hotplug: remove unused cpuhotplug_mutex_lock()
2009-04-02 19:05:00 -07:00
cpusets: replace zone allowed functions with node allowed
2009-04-02 19:04:57 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
dca: add missing copyright/license headers
2009-03-21 13:31:23 -07:00
fs: make struct dentry->d_op const
2009-03-27 14:43:59 -04:00
dm target: remove struct tt_internal
2009-04-02 19:55:28 +01:00
dynamic debug: combine dprintk and dynamic printk
2009-03-24 16:38:26 -07:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
dm raid1: add is_remote_recovering hook for clusters
2009-04-02 19:55:30 +01:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
intel-iommu: VT-d page table to support snooping control bit
2009-03-24 09:42:54 +00:00
dmaengine: Add privatecnt to revert DMA_PRIVATE property
2009-03-26 09:48:09 -07:00
dmi: Let dmi_walk() users pass private data
2009-03-30 21:46:44 +02:00
dw_dmac: add cyclic API to DW DMA driver
2009-04-01 15:42:34 -07:00
Dynamic debug: fix pr_fmt() build error
2009-03-24 16:38:27 -07:00
eventfd: improve support for semaphore-like behavior
2009-04-01 08:59:20 -07:00
Merge branch 'ext3-latency-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tytso/ext4
2009-04-03 11:10:33 -07:00
fbdev: uninline lock_fb_info()
2009-04-01 08:59:29 -07:00
firewire: cdev: add closure to async stream ioctl
2009-03-24 20:56:50 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2009-04-02 21:09:10 -07:00
New locking/refcounting for fs_struct
2009-03-31 23:00:26 -04:00
FS-Cache: Add use of /proc and presentation of statistics
2009-04-03 16:42:37 +01:00
FS-Cache: Implement data I/O part of netfs API
2009-04-03 16:42:39 +01:00
spi_mpc83xx: add OF platform driver bindings
2009-04-01 08:59:22 -07:00
block: genhd.h cleanup patch
2009-03-24 12:35:17 +01:00
remove <linux/ata.h> include from <linux/hdreg.h>
2009-04-01 21:42:26 +02:00
Merge branch 'autosuspend' into for-next
2009-03-30 15:14:53 +02:00
Fix highmem PPC build failure
2009-04-03 09:48:29 -07:00
i2c-algo-pca: Add PCA9665 support
2009-03-28 21:34:44 +01:00
V4L/DVB (11096): V4L2 Driver for the Hauppauge HD PVR usb capture device
2009-03-30 12:43:28 -03:00
i2c-algo-pca: Rework waiting for a free bus
2009-03-28 21:34:45 +01:00
ide: inline SELECT_DRIVE()
2009-03-31 20:15:33 +02:00
cgroup: CSS ID support
2009-04-02 19:04:53 -07:00
nl80211: Add MLME primitives to support external SME
2009-03-27 20:13:02 -04:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
2009-03-28 13:30:43 -07:00
wan: convert sdla driver to net_device_ops
2009-03-27 00:46:44 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
Merge branch 'topic/jack' into for-linus
2009-03-24 00:35:43 +01:00
Merge git://git.infradead.org/iommu-2.6
2009-04-03 10:36:57 -07:00
PM: Introduce functions for suspending and resuming device interrupts
2009-03-30 21:46:54 +02:00
intel-iommu: VT-d page table to support snooping control bit
2009-03-24 09:42:54 +00:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
proc 2/2: remove struct proc_dir_entry::owner
2009-03-31 01:14:44 +04:00
PM: Introduce functions for suspending and resuming device interrupts
2009-03-30 21:46:54 +02:00
Merge branch 'core/percpu' into percpu-cpumask-x86-for-linus-2
2009-03-27 17:28:43 +01:00
V4L/DVB (11042): v4l2-api: Add definitions for V4L2_MPEG_STREAM_VBI_FMT_IVTV payloads
2009-03-30 12:43:22 -03:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/trivial
2009-04-03 15:24:35 -07:00
ext4: Use WRITE_SYNC for commits which are caused by fsync()
2009-03-25 23:35:46 -04:00
make MTD headers use strict integer types
2009-03-26 18:14:17 +01:00
add fiemap.h to header-y
2009-04-02 19:04:49 -07:00
kexec: add dmesg log symbols to /proc/vmcoreinfo lists
2009-04-02 19:05:04 -07:00
Driver core: implement uevent suppress in kobject
2009-03-24 16:38:26 -07:00
KVM: Correct deassign device ioctl to IOW
2009-03-24 11:03:15 +02:00
KVM: Report IRQ injection status to userspace.
2009-03-24 11:03:11 +02:00
KVM: Move struct kvm_pio_request into x86 kvm_host.h
2009-03-24 11:02:55 +02:00
trivial: Fix misspelling of firmware
2009-03-30 15:21:59 +02:00
Factor out #ifdefs from kernel/spinlock.c to LOCK_CONTENDED_FLAGS
2009-04-02 19:05:10 -07:00
loop: add ioctl to resize a loop device
2009-04-01 08:59:17 -07:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
memcg: remove mem_cgroup_reclaim_imbalance() remnants
2009-04-02 19:04:56 -07:00
memory_accessor: new interface for reading/writing persistent memory
2009-04-02 19:04:50 -07:00
nommu: fix a number of issues with the per-MM VMA patch
2009-04-02 19:04:48 -07:00
generic debug pagealloc: build fix
2009-04-02 19:04:48 -07:00
mm: introduce for_each_populated_zone() macro
2009-04-01 08:59:11 -07:00
Get rid of indirect include of fs_struct.h
2009-03-31 23:00:27 -04:00
platform: introduce module id table for platform devices
2009-03-24 16:38:24 -07:00
Add a strictatime mount option
2009-03-26 10:56:35 -07:00
Remove two unneeded exports and make two symbols static in fs/mpage.c
2009-04-01 07:38:54 -04:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
PCI MSI: Add support for multiple MSI
2009-03-20 10:48:14 -07:00
constify dentry_operations: misc filesystems
2009-03-27 14:44:00 -04:00
Merge git://git.kernel.org/pub/scm/linux/kernel/git/jejb/scsi-misc-2.6
2009-03-28 13:30:43 -07:00
netlink: add NETLINK_NO_ENOBUFS socket flag
2009-03-24 16:37:55 -07:00
netpoll: store local and remote ip in net-endian
2009-03-28 23:55:58 -07:00
NFS: nfs_readpage_async() needs to be accessible as a fallback for local caching
2009-04-03 16:42:44 +01:00
NFS: Define and create superblock-level objects
2009-04-03 16:42:42 +01:00
NFS: Add some new I/O counters for FS-Cache doing things for NFS
2009-04-03 16:42:43 +01:00
Merge branch 'devel' into for-linus
2009-04-01 13:28:15 -04:00
nl80211: Remove NL80211_CMD_SET_MGMT_EXTRA_IE
2009-03-27 20:13:04 -04:00
Get rid of indirect include of fs_struct.h
2009-03-31 23:00:27 -04:00
generic debug pagealloc
2009-04-01 08:59:13 -07:00
FS-Cache: Recruit a page flags for cache management
2009-04-03 16:42:36 +01:00
cgroups: use css id in swap cgroup for saving memory v5
2009-04-02 19:04:56 -07:00
CacheFiles: Permit the page lock state to be monitored
2009-04-03 16:42:39 +01:00
mm: remove pagevec_swap_free()
2009-04-01 08:59:13 -07:00
PCI/ACPI: fix wrong assumption in acpi_find_root_bridge_handle
2009-03-20 10:47:57 -07:00
Merge branch 'linux-next' of git://git.kernel.org/pub/scm/linux/kernel/git/jbarnes/pci-2.6
2009-04-01 09:47:12 -07:00
pci: Add AMD8111 PCI Bridge PCI Device ID
2009-04-02 19:05:03 -07:00
PCI: save and restore PCIe 2.0 registers
2009-03-26 16:02:30 -07:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
driver core: move platform_data into platform_device
2009-03-24 16:38:26 -07:00
Driver core: Fix device_move() vs. dpm list ordering, v2
2009-03-24 16:38:26 -07:00
generic debug pagealloc
2009-04-01 08:59:13 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
proc 2/2: remove struct proc_dir_entry::owner
2009-03-31 01:14:44 +04:00
forget_original_parent: split out the un-ptrace part
2009-04-02 19:05:00 -07:00
trivial: PWM: fix of #endif comment
2009-03-30 15:22:01 +02:00
quota: Remove NODQUOT macro
2009-03-26 02:18:35 +01:00
quota: Remove uppercase aliases for quota functions.
2009-03-26 02:18:37 +01:00
reiserfs: fix build breakage
2009-03-30 14:28:58 -07:00
Merge branch 'reiserfs-updates' from Jeff Mahoney
2009-03-30 12:33:01 -07:00
reiserfs: make per-inode xattr locking more fine grained
2009-03-30 12:16:38 -07:00
reiserfs: strip trailing whitespace
2009-03-30 12:16:39 -07:00
reiserfs: add atomic addition of selinux attributes during inode creation
2009-03-30 12:16:39 -07:00
rtc-v3020: add ability to access v3020 chip with GPIOs
2009-04-02 19:04:51 -07:00
rtc: convert LEAP_YEAR into an inline
2009-04-01 08:59:24 -07:00
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs-2.6
2009-04-02 21:09:10 -07:00
lsm: Remove the socket_post_accept() hook
2009-03-28 15:01:37 +11:00
make most exported headers use strict integer types
2009-03-26 18:14:15 +01:00
cpumask: fix seq_bitmap_*() functions.
2009-03-30 22:05:11 +10:30
Merge branch 'master' of /home/davem/src/GIT/linux-2.6/
2009-03-29 01:40:34 -07:00
Document the slow work thread pool
2009-04-03 16:42:35 +01:00
Merge branches 'topic/slob/cleanups', 'topic/slob/fixes', 'topic/slub/core', 'topic/slub/cleanups' and 'topic/slub/perf' into for-linus
2009-03-24 10:25:21 +02:00
Merge branch 'header-fixes-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-26 16:11:41 -07:00
Allow rwlocks to re-enable interrupts
2009-04-02 19:05:11 -07:00
memdup_user(): introduce
2009-04-01 08:59:13 -07:00
pm: rework includes, remove arch ifdefs
2009-04-01 08:59:16 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
shmem: writepage directly to swap
2009-04-01 08:59:15 -07:00
synclink_gt: add clock options
2009-04-02 19:05:01 -07:00
Make non-compat preadv/pwritev use native register size
2009-04-04 14:20:34 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
Merge branch 'locking-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/linux-2.6-tip
2009-03-30 17:17:35 -07:00
hwrng: timeriomem - Use phys address rather than virt
2009-03-27 12:59:54 +08:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
tracehook_notify_death: use task_detached() helper
2009-04-02 19:05:00 -07:00
proc tty: remove struct tty_operations::read_proc
2009-04-01 08:59:10 -07:00
remove __KERNEL_STRICT_NAMES
2009-03-26 18:14:21 +01:00
UIO: Add name attributes for mappings and port regions
2009-03-24 16:38:24 -07:00
USB: make actual_length in struct urb field u32
2009-03-24 16:20:36 -07:00
usb-storage: prepare for subdriver separation
2009-03-24 16:20:34 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
V4L/DVB (10907): avoid loading the entire videodev.h header on V4L2 drivers
2009-03-30 12:43:15 -03:00
V4L/DVB (11213): gspca - sq905c: New subdriver.
2009-03-30 12:43:40 -03:00
epoll keyed wakeups: introduce new *_poll() wakeup macros
2009-04-01 08:59:20 -07:00
workqueue: add to_delayed_work() helper function
2009-04-02 19:04:50 -07:00
mm: fix proc_dointvec_userhz_jiffies "breakage"
2009-04-01 08:59:13 -07:00
make exported headers use strict posix types
2009-03-26 18:14:14 +01:00
