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| author | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-20 17:13:23 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2017-02-20 17:13:23 -0800 |
| commit | 59da2a0630b8db5fa71fa5ca0052fd3fe3766d94 (patch) | |
| tree | e3af6451f439ba2284a9c84f6976aa7e44b08fc9 /Documentation | |
| parent | ebb4949eb32ff500602f960525592fc4e614c5a7 (diff) | |
| parent | 372e2db7210df7c45ead46429aeb1443ba148060 (diff) | |
Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching
Pull livepatching updates from Jiri Kosina:
- removal of dead code (Kamalesh Babulal)
- documentation update (Miroslav Benes)
* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/jikos/livepatching:
livepatch: doc: remove the limitation for schedule() patching
powerpc/livepatch: Remove klp_write_module_reloc() stub
Diffstat (limited to 'Documentation')
| -rw-r--r-- | Documentation/livepatch/livepatch.txt | 19 |
1 files changed, 0 insertions, 19 deletions
diff --git a/Documentation/livepatch/livepatch.txt b/Documentation/livepatch/livepatch.txt index f5967316deb9..7f04e13ec53d 100644 --- a/Documentation/livepatch/livepatch.txt +++ b/Documentation/livepatch/livepatch.txt @@ -329,25 +329,6 @@ The current Livepatch implementation has several limitations: by "notrace". - + Anything inlined into __schedule() can not be patched. - - The switch_to macro is inlined into __schedule(). It switches the - context between two processes in the middle of the macro. It does - not save RIP in x86_64 version (contrary to 32-bit version). Instead, - the currently used __schedule()/switch_to() handles both processes. - - Now, let's have two different tasks. One calls the original - __schedule(), its registers are stored in a defined order and it - goes to sleep in the switch_to macro and some other task is restored - using the original __schedule(). Then there is the second task which - calls patched__schedule(), it goes to sleep there and the first task - is picked by the patched__schedule(). Its RSP is restored and now - the registers should be restored as well. But the order is different - in the new patched__schedule(), so... - - There is work in progress to remove this limitation. - - + Livepatch modules can not be removed. The current implementation just redirects the functions at the very |