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| author | Stephen Rothwell <sfr@canb.auug.org.au> | 2017-02-17 14:53:12 +1100 |
|---|---|---|
| committer | Stephen Rothwell <sfr@canb.auug.org.au> | 2017-02-17 14:53:12 +1100 |
| commit | e57ec2aa17f5f918686ccb1bcef488640efcf1ef (patch) | |
| tree | 3231a643c6ee455f5eae918521183c781272eea5 | |
| parent | c223b921c7a5bb8631be44e2e32b7fb4f2687fac (diff) | |
| parent | 372e2db7210df7c45ead46429aeb1443ba148060 (diff) | |
Merge remote-tracking branch 'livepatching/for-next'
| -rw-r--r-- | Documentation/livepatch/livepatch.txt | 19 | ||||
| -rw-r--r-- | arch/powerpc/include/asm/livepatch.h | 7 |
2 files changed, 0 insertions, 26 deletions
diff --git a/Documentation/livepatch/livepatch.txt b/Documentation/livepatch/livepatch.txt index cbfabd188779..9d2096c7160d 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 diff --git a/arch/powerpc/include/asm/livepatch.h b/arch/powerpc/include/asm/livepatch.h index a402f7f94896..47a03b9b528b 100644 --- a/arch/powerpc/include/asm/livepatch.h +++ b/arch/powerpc/include/asm/livepatch.h @@ -28,13 +28,6 @@ static inline int klp_check_compiler_support(void) return 0; } -static inline int klp_write_module_reloc(struct module *mod, unsigned long - type, unsigned long loc, unsigned long value) -{ - /* This requires infrastructure changes; we need the loadinfos. */ - return -ENOSYS; -} - static inline void klp_arch_set_pc(struct pt_regs *regs, unsigned long ip) { regs->nip = ip; |