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| author | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2010-12-23 16:25:29 -0500 |
|---|---|---|
| committer | Konrad Rzeszutek Wilk <konrad.wilk@oracle.com> | 2011-03-14 11:17:12 -0400 |
| commit | fc25151d9ac7d809239fe68de0a1490b504bb94a (patch) | |
| tree | cd9ef4fdd796c49affe1c3d432a0fd9581c58d64 /arch/x86/xen/Kconfig | |
| parent | 2222e71bd6eff7b2ad026d4ee663b6327c5a49f5 (diff) | |
| download | linux-fc25151d9ac7d809239fe68de0a1490b504bb94a.tar.gz linux-fc25151d9ac7d809239fe68de0a1490b504bb94a.tar.bz2 linux-fc25151d9ac7d809239fe68de0a1490b504bb94a.zip | |
xen/debug: WARN_ON when identity PFN has no _PAGE_IOMAP flag set.
Only enabled if XEN_DEBUG is enabled. We print a warning
when:
pfn_to_mfn(pfn) == pfn, but no VM_IO (_PAGE_IOMAP) flag set
(and pfn is an identity mapped pfn)
pfn_to_mfn(pfn) != pfn, and VM_IO flag is set.
(ditto, pfn is an identity mapped pfn)
[v2: Make it dependent on CONFIG_XEN_DEBUG instead of ..DEBUG_FS]
[v3: Fix compiler warning]
Reviewed-by: Ian Campbell <ian.campbell@citrix.com>
Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Diffstat (limited to 'arch/x86/xen/Kconfig')
| -rw-r--r-- | arch/x86/xen/Kconfig | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/arch/x86/xen/Kconfig b/arch/x86/xen/Kconfig index 5b54892e4bc3..e4343fe488ed 100644 --- a/arch/x86/xen/Kconfig +++ b/arch/x86/xen/Kconfig @@ -48,3 +48,11 @@ config XEN_DEBUG_FS help Enable statistics output and various tuning options in debugfs. Enabling this option may incur a significant performance overhead. + +config XEN_DEBUG + bool "Enable Xen debug checks" + depends on XEN + default n + help + Enable various WARN_ON checks in the Xen MMU code. + Enabling this option WILL incur a significant performance overhead. |