[
{
"PEBS": "1",
"EventCode": "0xF7",
"Counter": "0,1,2,3",
"UMask": "0x1",
"EventName": "FP_ASSIST.ALL",
"SampleAfterValue": "20000",
"BriefDescription": "X87 Floating point assists (Precise Event)"
},
{
"PEBS": "1",
"EventCode": "0xF7",
"Counter": "0,1,2,3",
"UMask": "0x4",
"EventName": "FP_ASSIST.INPUT",
"SampleAfterValue": "20000",
"BriefDescription": "X87 Floating poiint assists for invalid input value (Precise Event)"
},
{
"PEBS": "1",
"EventCode": "0xF7",
"Counter": "0,1,2,3",
"UMask": "0x2",
"EventName": "FP_ASSIST.OUTPUT",
"SampleAfterValue": "20000",
"BriefDescription": "X87 Floating point assists for invalid output value (Precise Event)"
},
{
"EventCode": "0x10",
"Counter": "0,1,2,3",
"UMask": "0x2",
"EventName": "FP_COMP_OPS_EXE.MMX",
"SampleAfterValue": "2000000",
"BriefDescription": "MMX Uops"
},
{
"EventCode": "0x10",
"Counter": "0,1,2,3",
"UMask": "0x80",
"EventName": "FP_COMP_OPS_EXE.SSE_DOUBLE_PRECISION",
"SampleAfterValue": "2000000",
"BriefDescription": "SSE* FP double precision Uops"
},
{
"EventCode": "0x10",
"Counter": "0,1,2,3",
"UMask": "0x4",
"EventName": "FP_COMP_OPS_EXE.SSE_FP",
"SampleAfterValue": "2000000",
"BriefDescription": "SSE and SSE2 FP Uops"
},
{
"EventCode": "0x10",
"Counter": "0,1,2,3",
"UMask": "0x10",
"EventName": "FP_COMP_OPS_EXE.SSE_FP_PACKED",
"SampleAfterValue": "2000000",
"BriefDescription": "SSE FP packed Uops"
},
{
"EventCode": "0x10",
"Counter": "0,1,2,3",
"UMask": "0x20",
"EventName": "FP_COMP_OPS_EXE.SSE_FP_SCALAR",
"SampleAfterValue": "2000000",
"BriefDescription": "SSE FP scalar Uops"
},
{
"EventCode": "0x10",
"Counter": "0,1,2,3",
"UMask": "0x40",
"EventName": "FP_COMP_OPS_EXE.SSE_SINGLE_PRECISION",
"SampleAfterValue": "2000000",
"BriefDescription": "SSE* FP single precision Uops"
},
{
"EventCode": "0x10",
"Counter": "0,1,2,3",
"UMask": "0x8",
"EventName": "FP_COMP_OPS_EXE.SSE2_INTEGER",
"SampleAfterValue": "2000000",
"BriefDescription": "SSE2 integer Uops"
},
{
"EventCode": "0x10",
"Counter": "0,1,2,3",
"UMask": "0x1",
"EventName": "FP_COMP_OPS_EXE.X87",
"SampleAfterValue": "2000000",
"BriefDescription": "Computational floating-point operations executed"
},
{
"EventCode": "0xCC",
"Counter": "0,1,2,3",
"UMask": "0x3",
"EventName": "FP_MMX_TRANS.ANY",
"SampleAfterValue": "2000000",
"BriefDescription": "All Floating Point to and from MMX transitions"
},
{
"EventCode": "0xCC",
"Counter": "0,1,2,3",
"UMask": "0x1",
"EventName": "FP_MMX_TRANS.TO_FP",
"SampleAfterValue": "2000000",
"BriefDescription": "Transitions from MMX to Floating Point instructions"
},
{
"EventCode": "0xCC",
"Counter": "0,1,2,3",
"UMask": "0x2",
"EventName": "FP_MMX_TRANS.TO_MMX",
"SampleAfterValue": "2000000",
"BriefDescription": "Transitions from Floating Point to MMX instructions"
},
{
"EventCode": "0x12",
"Counter": "0,1,2,3",
"UMask": "0x4",
"EventName": "SIMD_INT_128.PACK",
"SampleAfterValue": "200000",
"BriefDescription": "128 bit SIMD integer pack operations"
},
{
"EventCode": "0x12",
"Counter": "0,1,2,3",
"UMask": "0x20",
"EventName": "SIMD_INT_128.PACKED_ARITH",
"SampleAfterValue": "200000",
"BriefDescription": "128 bit SIMD integer arithmetic operations"
},
{
"EventCode": "0x12",
"Counter": "0,1,2,3",
"UMask": "0x10",
"EventName": "SIMD_INT_128.PACKED_LOGICAL",
"SampleAfterValue": "200000",
"BriefDescription": "128 bit SIMD integer logical operations"
},
{
"EventCode": "0x12",
"Counter": "0,1,2,3",
"UMask": "0x1",
"EventName": "SIMD_INT_128.PACKED_MPY",
"SampleAfterValue": "200000",
"BriefDescription": "128 bit SIMD integer multiply operations"
},
{
"EventCode": "0x12",
"Counter": "0,1,2,3",
"UMask": "0x2",
"EventName": "SIMD_INT_128.PACKED_SHIFT",
"SampleAfterValue": "200000",
"BriefDescription": "128 bit SIMD integer shift operations"
},
{
"EventCode": "0x12",
"Counter": "0,1,2,3",
"UMask": "0x40",
"EventName": "SIMD_INT_128.SHUFFLE_MOVE",
"SampleAfterValue": "200000",
"BriefDescription": "128 bit SIMD integer shuffle/move operations"
},
{
"EventCode": "0x12",
"Counter": "0,1,2,3",
"UMask": "0x8",
"EventName": "SIMD_INT_128.UNPACK",
"SampleAfterValue": "200000",
"BriefDescription": "128 bit SIMD integer unpack operations"
},
{
"EventCode": "0xFD",
"Counter": "0,1,2,3",
"UMask": "0x4",
"EventName": "SIMD_INT_64.PACK",
"SampleAfterValue": "200000",
"BriefDescription": "SIMD integer 64 bit pack operations"
},
{
"EventCode": "0xFD",
"Counter": "0,1,2,3",
"UMask": "0x20",
"EventName": "SIMD_INT_64.PACKED_ARITH",
"SampleAfterValue": "200000",
"BriefDescription": "SIMD integer 64 bit arithmetic operations"
},
{
"EventCode": "0xFD",
"Counter": "0,1,2,3",
"UMask": "0x10",
"EventName": "SIMD_INT_64.PACKED_LOGICAL",
"SampleAfterValue": "200000",
"BriefDescription": "SIMD integer 64 bit logical operations"
},
{
"EventCode": "0xFD",
"Counter": "0,1,2,3",
"UMask": "0x1",
"EventName": "SIMD_INT_64.PACKED_MPY",
"SampleAfterValue": "200000",
"BriefDescription": "SIMD integer 64 bit packed multiply operations"
},
{
"EventCode": "0xFD",
"Counter": "0,1,2,3",
"UMask": "0x2",
"EventName": "SIMD_INT_64.PACKED_SHIFT",
"SampleAfterValue": "200000",
"BriefDescription": "SIMD integer 64 bit shift operations"
},
{
"EventCode": "0xFD",
"Counter": "0,1,2,3",
"UMask": "0x40",
"EventName": "SIMD_INT_64.SHUFFLE_MOVE",
"SampleAfterValue": "200000",
"BriefDescription": "SIMD integer 64 bit shuffle/move operations"
},
{
"EventCode": "0xFD",
"Counter": "0,1,2,3",
"UMask": "0x8",
"EventName": "SIMD_INT_64.UNPACK",
"SampleAfterValue": "200000",
"BriefDescription": "SIMD integer 64 bit unpack operations"
}
]_del() and attempted to dereference
> a m_hash.pprev that had been poisioned by another thread.
Al Viro observed that the simple fix is to switch from using the namespace_sem
to the mount_lock to protect the mountpoint hash table.
I have taken Al's suggested patch moved put_mountpoint in pivot_root
(instead of taking mount_lock an additional time), and have replaced
new_mountpoint with get_mountpoint a function that does the hash table
lookup and addition under the mount_lock. The introduction of get_mounptoint
ensures that only the mount_lock is needed to manipulate the mountpoint
hashtable.
d_set_mounted is modified to only set DCACHE_MOUNTED if it is not
already set. This allows get_mountpoint to use the setting of
DCACHE_MOUNTED to ensure adding a struct mountpoint for a dentry
happens exactly once.
Cc: stable@vger.kernel.org
Fixes: ce07d891a089 ("mnt: Honor MNT_LOCKED when detaching mounts")
Reported-by: Krister Johansen <kjlx@templeofstupid.com>
Suggested-by: Al Viro <viro@ZenIV.linux.org.uk>
Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>