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9028b18f75
freebsd-dev/sys
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Zbigniew Bodek 9028b18f75 Enable IRQ during syscalls on ARM64 
FreeBSD provides a feature called Adaptive Mutexes, which allows
a thread to spin for a while when the mutex is taken instead of
immediately going to sleep. This causes issues when called from
syscall handler if interrupts are masked. If every other core
also attempts to access the same mutex there is a chance that
all of them are spinning on the same lock at the same time.
If interrupts are disabled, no kernel preemtion can occur and
the system becomes unresponsive.

This patch enables interrupts when syscall is being executed
and masks them as soon as it is completed.

Reviewed by:   andrew
Obtained from: Semihalf
Sponsored by:  The FreeBSD Foundation
Differential Revision: https://reviews.freebsd.org/D3246
2015-07-30 13:59:38 +00:00
..
amd64 Remove full barrier from the amd64 atomic_load_acq_*(). Strong 2015-07-28 07:04:51 +00:00
arm Remove obsolete vendor code from Alpine platform support 2015-07-30 13:45:34 +00:00
arm64 Enable IRQ during syscalls on ARM64 2015-07-30 13:59:38 +00:00
boot Use consistent spacing. 2015-07-25 20:17:19 +00:00
bsm
cam Refactor unmapped buffer address handling. 2015-07-23 19:13:41 +00:00
cddl Add warning about low KSTACK_PAGES for ZFS use 2015-07-28 11:19:38 +00:00
compat Make pipes in CloudABI work. 2015-07-29 17:18:27 +00:00
conf Merge ACPICA 20150717. 2015-07-22 16:25:07 +00:00
contrib Import Annapurna Labs Alpine HAL to sys/contrib/ 2015-07-28 14:20:33 +00:00
crypto const'ify an arg that we don't update... 2015-07-29 23:37:15 +00:00
ddb Various changes to the registers displayed in DDB for x86. 2015-07-22 01:09:02 +00:00
dev Add support for Xen blkif indirect segment I/Os. This makes it possible for 2015-07-30 03:50:01 +00:00
fs This patch fixes a problem where, if the NFSv4 server has a previous 2015-07-29 23:06:30 +00:00
gdb CALLOUT_MPSAFE has lost its meaning since r141428, i.e., for more than ten 2015-05-22 17:05:21 +00:00
geom Report the scheme and provider names in warning message about unaligned 2015-07-26 11:16:48 +00:00
gnu
i386 Use private cache line for the locked nop in *mb() on i386. 2015-07-30 00:13:20 +00:00
isa
kern Make pipes in CloudABI work. 2015-07-29 17:18:27 +00:00
kgssapi
libkern Remove checks for __ARM_EABI__, we only build for EABI now. 2015-07-09 21:02:40 +00:00
mips Remove dead functions pmap_pvdump and pads. 2015-07-29 20:47:27 +00:00
modules Build if_stf(4) module only when both INET and INET6 support are enabled. 2015-07-30 10:26:43 +00:00
net Build if_stf(4) module only when both INET and INET6 support are enabled. 2015-07-30 10:26:43 +00:00
net80211 Break out the current 802.11 software scan methods into an indirect table. 2015-06-08 02:35:43 +00:00
netgraph * Address review (and add a bit myself). 2015-07-12 18:14:38 +00:00
netinet Avoid double reference decrement when firewalls force relooping of packets 2015-07-29 20:10:36 +00:00
netinet6 Eliminate the use of m_copydata() in gif_encapcheck(). 2015-07-29 14:07:43 +00:00
netipsec RFC4868 section 2.3 requires that the output be half... This fixes 2015-07-29 07:15:16 +00:00
netnatm
netpfil Reduce overhead of ipfw's me6 opcode. 2015-07-29 10:53:42 +00:00
netsmb
nfs
nfsclient
nfsserver
nlm
ofed Fix broken implementation of "kvasprintf()" function by adding missing 2015-07-03 11:16:20 +00:00
opencrypto Fix XTS, and name things a bit better... 2015-07-14 07:45:18 +00:00
pc98 Spell crypto correctly. 2015-07-14 10:47:56 +00:00
powerpc Implement the lockstat provider using SDT(9) instead of the custom provider 2015-07-19 22:14:09 +00:00
rpc Remove useless acquire semantic from the atomic_add operation before 2015-07-28 06:58:10 +00:00
security fd: make 'rights' a manadatory argument to fget* functions 2015-07-05 19:05:16 +00:00
sparc64 o Revert the other functional half of r239864, i. e. the merge of r134227 2015-07-24 15:13:21 +00:00
sys Revert r265338, r271089 and r271123 as those changes do not handle 2015-07-29 17:59:13 +00:00
teken
tools
ufs - Make 'struct buf *buf' private to vfs_bio.c. Having a global variable 2015-07-29 02:26:57 +00:00
vm - Make 'struct buf *buf' private to vfs_bio.c. Having a global variable 2015-07-29 02:26:57 +00:00
x86 Add bit names for the IA32_MISC_ENABLE msr. 2015-07-28 06:55:08 +00:00
xdr
xen Add support for Xen blkif indirect segment I/Os. This makes it possible for 2015-07-30 03:50:01 +00:00
Makefile Kill EoL whitespace. 2015-05-29 14:03:07 +00:00