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authorKees Cook <keescook@chromium.org>2018-08-22 07:53:10 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-22 20:52:44 +0300
commit8c9a134cae6f8d66f35321b07baa202f75ef2199 (patch)
tree904ddde917ef7f993e5e1031a0ddfe03632870f7 /Documentation
parenta670468f5e0b5fad4db6e4d195f15915dc2a35c1 (diff)
downloadlinux-8c9a134cae6f8d66f35321b07baa202f75ef2199.tar.xz
mm: clarify CONFIG_PAGE_POISONING and usage
The Kconfig text for CONFIG_PAGE_POISONING doesn't mention that it has to be enabled explicitly. This updates the documentation for that and adds a note about CONFIG_PAGE_POISONING to the "page_poison" command line docs. While here, change description of CONFIG_PAGE_POISONING_ZERO too, as it's not "random" data, but rather the fixed debugging value that would be used when not zeroing. Additionally removes a stray "bool" in the Kconfig. Link: http://lkml.kernel.org/r/20180725223832.GA43733@beast Signed-off-by: Kees Cook <keescook@chromium.org> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Cc: Jonathan Corbet <corbet@lwn.net> Cc: Laura Abbott <labbott@redhat.com> Cc: Naoya Horiguchi <n-horiguchi@ah.jp.nec.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'Documentation')
-rw-r--r--Documentation/admin-guide/kernel-parameters.txt5
1 files changed, 3 insertions, 2 deletions
diff --git a/Documentation/admin-guide/kernel-parameters.txt b/Documentation/admin-guide/kernel-parameters.txt
index bffb0caa3693..970d837bd57f 100644
--- a/Documentation/admin-guide/kernel-parameters.txt
+++ b/Documentation/admin-guide/kernel-parameters.txt
@@ -3041,8 +3041,9 @@
on: enable the feature
page_poison= [KNL] Boot-time parameter changing the state of
- poisoning on the buddy allocator.
- off: turn off poisoning
+ poisoning on the buddy allocator, available with
+ CONFIG_PAGE_POISONING=y.
+ off: turn off poisoning (default)
on: turn on poisoning
panic= [KNL] Kernel behaviour on panic: delay <timeout>