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45dd9b0666
linux/arch/x86/xen
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Steven Rostedt (VMware) 45dd9b0666 tracing/x86/xen: Remove zero data size trace events trace_xen_mmu_flush_tlb{_all} 
Doing an audit of trace events, I discovered two trace events in the xen
subsystem that use a hack to create zero data size trace events. This is not
what trace events are for. Trace events add memory footprint overhead, and
if all you need to do is see if a function is hit or not, simply make that
function noinline and use function tracer filtering.

Worse yet, the hack used was:

 __array(char, x, 0)

Which creates a static string of zero in length. There's assumptions about
such constructs in ftrace that this is a dynamic string that is nul
terminated. This is not the case with these tracepoints and can cause
problems in various parts of ftrace.

Nuke the trace events!

Link: http://lkml.kernel.org/r/20180509144605.5a220327@gandalf.local.home

Cc: stable@vger.kernel.org
Fixes: 95a7d76897 ("xen/mmu: Use Xen specific TLB flush instead of the generic one.")
Reviewed-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2018-05-14 17:02:30 -04:00
..
apic.c Merge branch 'WIP.x86/asm' into x86/urgent, because the topic is ready 2018-04-12 09:42:34 +02:00
debugfs.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
debugfs.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
efi.c x86/xen/efi: Initialize only the EFI struct members used by Xen 2017-06-23 11:11:03 +02:00
enlighten_hvm.c x86/virt/xen: Use guest_late_init to detect Xen PVH guest 2017-11-10 10:03:14 +01:00
enlighten_pv.c x86/xen: Remove use of VLAs 2018-04-19 16:35:51 -04:00
enlighten_pvh.c x86/xen: Add pvh specific rsdp address retrieval function 2018-02-26 08:43:20 +01:00
enlighten.c xen/balloon: Mark unallocated host memory as UNUSABLE 2017-12-20 13:16:20 -05:00
grant-table.c xen: re-introduce support for grant v2 interface 2017-11-06 15:50:17 -05:00
irq.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Kconfig x86/xen: Allow XEN_PV and XEN_PVH to be enabled with X86_5LEVEL 2018-02-21 10:19:18 +01:00
Makefile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mmu_hvm.c x86/gart: Exclude GART aperture from vmcore 2018-01-11 15:09:24 +01:00
mmu_pv.c tracing/x86/xen: Remove zero data size trace events trace_xen_mmu_flush_tlb{_all} 2018-05-14 17:02:30 -04:00
mmu.c tracing/x86/xen: Remove zero data size trace events trace_xen_mmu_flush_tlb{_all} 2018-05-14 17:02:30 -04:00
mmu.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
multicalls.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
multicalls.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
p2m.c xen: Fix {set,clear}_foreign_p2m_mapping on autotranslating guests 2018-02-08 10:40:49 +01:00
pci-swiotlb-xen.c xen-swiotlb: consolidate xen_swiotlb_dma_ops 2017-06-20 11:12:59 +02:00
platform-pci-unplug.c xen/pvh: PVH guests always have PV devices 2017-02-07 08:07:01 -05:00
pmu.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pmu.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
setup.c xen: fixes for 4.15-rc5 2017-12-22 12:30:10 -08:00
smp_hvm.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
smp_pv.c time: tick-sched: Reorganize idle tick management code 2018-04-05 18:58:47 +02:00
smp.c x86/xen: Calculate __max_logical_packages on PV domains 2018-02-17 09:40:45 +01:00
smp.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
spinlock.c x86/headers: Remove duplicate #includes 2017-12-12 11:32:24 +01:00
suspend_hvm.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
suspend_pv.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
suspend.c x86/xen: Zero MSR_IA32_SPEC_CTRL before suspend 2018-02-28 16:03:19 +01:00
time.c xen: features and fixes for v4.15-rc1 2017-11-16 13:06:27 -08:00
trace.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vdso.h
vga.c License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xen-asm_32.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xen-asm_64.S x86/xen: Support early interrupts in xen pv guests 2017-11-28 00:28:56 +01:00
xen-asm.S License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xen-head.S xen/pvh: Indicate XENFEAT_linux_rsdp_unrestricted to Xen 2018-04-10 09:22:22 -04:00
xen-ops.h xen: fixes for 4.15-rc8 2018-01-12 10:00:15 -08:00
xen-pvh.S x86/boot/64: Rename init_level4_pgt and early_level4_pgt 2017-06-13 08:56:55 +02:00