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authorLevin, Alexander (Sasha Levin) <alexander.levin@verizon.com>2017-11-15 17:36:02 -0800
committerLinus Torvalds <torvalds@linux-foundation.org>2017-11-15 18:21:05 -0800
commit4675ff05de2d76d167336b368bd07f3fef6ed5a6 (patch)
tree212d8adf40e13c2a27ac7834d14ca4900923b98c /lib
parentd8be75663cec0069b85f80191abd2682ce4a512f (diff)
download96b-common-4675ff05de2d76d167336b368bd07f3fef6ed5a6.tar.gz
kmemcheck: rip it out
Fix up makefiles, remove references, and git rm kmemcheck. Link: http://lkml.kernel.org/r/20171007030159.22241-4-alexander.levin@verizon.com Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Vegard Nossum <vegardno@ifi.uio.no> Cc: Pekka Enberg <penberg@kernel.org> Cc: Michal Hocko <mhocko@kernel.org> Cc: Eric W. Biederman <ebiederm@xmission.com> Cc: Alexander Potapenko <glider@google.com> Cc: Tim Hansen <devtimhansen@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/Kconfig.debug6
-rw-r--r--lib/Kconfig.kmemcheck94
2 files changed, 2 insertions, 98 deletions
diff --git a/lib/Kconfig.debug b/lib/Kconfig.debug
index 07ce7449765a..5402e3954659 100644
--- a/lib/Kconfig.debug
+++ b/lib/Kconfig.debug
@@ -504,7 +504,7 @@ config DEBUG_OBJECTS_ENABLE_DEFAULT
config DEBUG_SLAB
bool "Debug slab memory allocations"
- depends on DEBUG_KERNEL && SLAB && !KMEMCHECK
+ depends on DEBUG_KERNEL && SLAB
help
Say Y here to have the kernel do limited verification on memory
allocation as well as poisoning memory on free to catch use of freed
@@ -516,7 +516,7 @@ config DEBUG_SLAB_LEAK
config SLUB_DEBUG_ON
bool "SLUB debugging on by default"
- depends on SLUB && SLUB_DEBUG && !KMEMCHECK
+ depends on SLUB && SLUB_DEBUG
default n
help
Boot with debugging on by default. SLUB boots by default with
@@ -730,8 +730,6 @@ config DEBUG_STACKOVERFLOW
If in doubt, say "N".
-source "lib/Kconfig.kmemcheck"
-
source "lib/Kconfig.kasan"
endmenu # "Memory Debugging"
diff --git a/lib/Kconfig.kmemcheck b/lib/Kconfig.kmemcheck
deleted file mode 100644
index 846e039a86b4..000000000000
--- a/lib/Kconfig.kmemcheck
+++ /dev/null
@@ -1,94 +0,0 @@
-config HAVE_ARCH_KMEMCHECK
- bool
-
-if HAVE_ARCH_KMEMCHECK
-
-menuconfig KMEMCHECK
- bool "kmemcheck: trap use of uninitialized memory"
- depends on DEBUG_KERNEL
- depends on !X86_USE_3DNOW
- depends on SLUB || SLAB
- depends on !CC_OPTIMIZE_FOR_SIZE
- depends on !FUNCTION_TRACER
- select FRAME_POINTER
- select STACKTRACE
- default n
- help
- This option enables tracing of dynamically allocated kernel memory
- to see if memory is used before it has been given an initial value.
- Be aware that this requires half of your memory for bookkeeping and
- will insert extra code at *every* read and write to tracked memory
- thus slow down the kernel code (but user code is unaffected).
-
- The kernel may be started with kmemcheck=0 or kmemcheck=1 to disable
- or enable kmemcheck at boot-time. If the kernel is started with
- kmemcheck=0, the large memory and CPU overhead is not incurred.
-
-choice
- prompt "kmemcheck: default mode at boot"
- depends on KMEMCHECK
- default KMEMCHECK_ONESHOT_BY_DEFAULT
- help
- This option controls the default behaviour of kmemcheck when the
- kernel boots and no kmemcheck= parameter is given.
-
-config KMEMCHECK_DISABLED_BY_DEFAULT
- bool "disabled"
- depends on KMEMCHECK
-
-config KMEMCHECK_ENABLED_BY_DEFAULT
- bool "enabled"
- depends on KMEMCHECK
-
-config KMEMCHECK_ONESHOT_BY_DEFAULT
- bool "one-shot"
- depends on KMEMCHECK
- help
- In one-shot mode, only the first error detected is reported before
- kmemcheck is disabled.
-
-endchoice
-
-config KMEMCHECK_QUEUE_SIZE
- int "kmemcheck: error queue size"
- depends on KMEMCHECK
- default 64
- help
- Select the maximum number of errors to store in the queue. Since
- errors can occur virtually anywhere and in any context, we need a
- temporary storage area which is guarantueed not to generate any
- other faults. The queue will be emptied as soon as a tasklet may
- be scheduled. If the queue is full, new error reports will be
- lost.
-
-config KMEMCHECK_SHADOW_COPY_SHIFT
- int "kmemcheck: shadow copy size (5 => 32 bytes, 6 => 64 bytes)"
- depends on KMEMCHECK
- range 2 8
- default 5
- help
- Select the number of shadow bytes to save along with each entry of
- the queue. These bytes indicate what parts of an allocation are
- initialized, uninitialized, etc. and will be displayed when an
- error is detected to help the debugging of a particular problem.
-
-config KMEMCHECK_PARTIAL_OK
- bool "kmemcheck: allow partially uninitialized memory"
- depends on KMEMCHECK
- default y
- help
- This option works around certain GCC optimizations that produce
- 32-bit reads from 16-bit variables where the upper 16 bits are
- thrown away afterwards. This may of course also hide some real
- bugs.
-
-config KMEMCHECK_BITOPS_OK
- bool "kmemcheck: allow bit-field manipulation"
- depends on KMEMCHECK
- default n
- help
- This option silences warnings that would be generated for bit-field
- accesses where not all the bits are initialized at the same time.
- This may also hide some real bugs.
-
-endif