#include const char *abi(void) { #if defined(__amd64__) || defined(__x86_64__) || defined(__AMD64__) || defined(_M_X64) || defined(__amd64) return "amd64"; #elif defined(__i386__) || defined(__x86__) || defined(__X86__) || defined(_M_IX86) || defined(__i386) return "x86"; #elif defined(__ia64__) || defined(__IA64__) || defined(__M_IA64) return "ia64"; #elif defined(__SPU__) return "cellspu"; #elif defined(__powerpc64__) || defined(__ppc64__) || defined(__PPC64__) || defined(_ARCH_PPC64) return "ppc64"; #elif defined(__powerpc__) || defined(__ppc__) || defined(__PPC__) || defined(_ARCH_PPC) return "ppc32"; #elif defined(__sparcv9__) || defined(__sparcv9) return "sparcv9"; #elif defined(__sparc_v8__) return "sparcv8"; #elif defined(__sparc__) || defined(__sparc) if (sizeof(long) == 4) return "sparcv8"; return "sparcv9"; #elif defined(__ARM_EABI__) return "armeabi"; #elif defined(__arm__) return "arm"; #elif defined(__mips__) || defined(__mips) || defined(__MIPS__) # if defined(_ABIO32) return "mipso32"; # elif defined(_ABIN32) return "mips32"; # else return "mips64"; # endif #else return "default"; #endif } int main(void) { printf("%s\n", abi()); return 0; } ds-private-remove' selected='selected'>nds-private-remove net-next plumbingsTobias Klauser
summaryrefslogtreecommitdiff
path: root/include/rdma/opa_port_info.h
diff options
context:
space:
mode:
authorDouglas Miller <dougmill@linux.vnet.ibm.com>2017-01-28 06:42:20 -0600
committerTejun Heo <tj@kernel.org>2017-01-28 07:49:42 -0500
commit966d2b04e070bc040319aaebfec09e0144dc3341 (patch)
tree4b96156e3d1dd4dfd6039b7c219c9dc4616da52d /include/rdma/opa_port_info.h
parent1b1bc42c1692e9b62756323c675a44cb1a1f9dbd (diff)
percpu-refcount: fix reference leak during percpu-atomic transition
percpu_ref_tryget() and percpu_ref_tryget_live() should return "true" IFF they acquire a reference. But the return value from atomic_long_inc_not_zero() is a long and may have high bits set, e.g. PERCPU_COUNT_BIAS, and the return value of the tryget routines is bool so the reference may actually be acquired but the routines return "false" which results in a reference leak since the caller assumes it does not need to do a corresponding percpu_ref_put(). This was seen when performing CPU hotplug during I/O, as hangs in blk_mq_freeze_queue_wait where percpu_ref_kill (blk_mq_freeze_queue_start) raced with percpu_ref_tryget (blk_mq_timeout_work). Sample stack trace: __switch_to+0x2c0/0x450 __schedule+0x2f8/0x970 schedule+0x48/0xc0 blk_mq_freeze_queue_wait+0x94/0x120 blk_mq_queue_reinit_work+0xb8/0x180 blk_mq_queue_reinit_prepare+0x84/0xa0 cpuhp_invoke_callback+0x17c/0x600 cpuhp_up_callbacks+0x58/0x150 _cpu_up+0xf0/0x1c0 do_cpu_up+0x120/0x150 cpu_subsys_online+0x64/0xe0 device_online+0xb4/0x120 online_store+0xb4/0xc0 dev_attr_store+0x68/0xa0 sysfs_kf_write+0x80/0xb0 kernfs_fop_write+0x17c/0x250 __vfs_write+0x6c/0x1e0 vfs_write+0xd0/0x270 SyS_write+0x6c/0x110 system_call+0x38/0xe0 Examination of the queue showed a single reference (no PERCPU_COUNT_BIAS, and __PERCPU_REF_DEAD, __PERCPU_REF_ATOMIC set) and no requests. However, conditions at the time of the race are count of PERCPU_COUNT_BIAS + 0 and __PERCPU_REF_DEAD and __PERCPU_REF_ATOMIC set. The fix is to make the tryget routines use an actual boolean internally instead of the atomic long result truncated to a int. Fixes: e625305b3907 percpu-refcount: make percpu_ref based on longs instead of ints Link: https://bugzilla.kernel.org/show_bug.cgi?id=190751 Signed-off-by: Douglas Miller <dougmill@linux.vnet.ibm.com> Reviewed-by: Jens Axboe <axboe@fb.com> Signed-off-by: Tejun Heo <tj@kernel.org> Fixes: e625305b3907 ("percpu-refcount: make percpu_ref based on longs instead of ints") Cc: stable@vger.kernel.org # v3.18+
Diffstat (limited to 'include/rdma/opa_port_info.h')