diff options
| author | Nicholas Piggin <npiggin@gmail.com> | 2016-09-16 20:48:08 +1000 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2016-09-19 10:53:54 +1000 |
| commit | 03465f899bdac70d34f6ca447a74d8ae9e284ce5 (patch) | |
| tree | 5822e3b95e15197b2ea837dca99da30342c7b618 /arch/powerpc/mm/fault.c | |
| parent | e1c0d66fcb179a1737b3d5cc11c6e37bcabbd861 (diff) | |
powerpc: Use kprobe blacklist for exception handlers
Currently we mark the C implementations of some exception handlers as
__kprobes. This has the effect of putting them in the ".kprobes.text"
section, which separates them from the rest of the text.
Instead we can use the blacklist macros to add the symbols to a
blacklist which kprobes will check. This allows the linker to move
exception handler functions close to callers and avoids trampolines in
larger kernels.
Signed-off-by: Nicholas Piggin <npiggin@gmail.com>
[mpe: Reword change log a bit]
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'arch/powerpc/mm/fault.c')
| -rw-r--r-- | arch/powerpc/mm/fault.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/arch/powerpc/mm/fault.c b/arch/powerpc/mm/fault.c index bb1ffc559f38..d0b137d96df1 100644 --- a/arch/powerpc/mm/fault.c +++ b/arch/powerpc/mm/fault.c @@ -205,7 +205,7 @@ static int mm_fault_error(struct pt_regs *regs, unsigned long addr, int fault) * The return value is 0 if the fault was handled, or the signal * number if this is a kernel fault that can't be handled here. */ -int __kprobes do_page_fault(struct pt_regs *regs, unsigned long address, +int do_page_fault(struct pt_regs *regs, unsigned long address, unsigned long error_code) { enum ctx_state prev_state = exception_enter(); @@ -498,8 +498,8 @@ bad_area_nosemaphore: bail: exception_exit(prev_state); return rc; - } +NOKPROBE_SYMBOL(do_page_fault); /* * bad_page_fault is called when we have a bad access from the kernel. |