On Thu, Feb 25, 2016 at 11:30:38AM +1100, Balbir Singh wrote: > On 25/02/16 01:28, Michael Ellerman wrote: > > Signed-off-by: Michael Ellerman <mpe@xxxxxxxxxxxxxx> > > --- > > arch/powerpc/kernel/entry_64.S | 8 ++++++++ > > 1 file changed, 8 insertions(+) > > Ah, -mprofile-kernel, DYNAMIC_FTRACE but without REGS. Hadn't considered that, thanks! > > > > diff --git a/arch/powerpc/kernel/entry_64.S b/arch/powerpc/kernel/entry_64.S > > index 2a7313cfbc7d..9e77a2c8f218 100644 > > --- a/arch/powerpc/kernel/entry_64.S > > +++ b/arch/powerpc/kernel/entry_64.S > > @@ -1237,6 +1237,11 @@ _GLOBAL(ftrace_graph_caller) > > std r5, 64(r1) > > std r4, 56(r1) > > std r3, 48(r1) > > + > > + /* Save callee's TOC in the ABI compliant location */ > > + std r2, 24(r1) > R2_STACK_OFFSET for readability? I have encountered LRSAVE vs. PPC_LR_STKOFF and STK_GOT vs. R2_STACK_OFFSET, some usable in assembler source, some in C. > > + ld r2, PACATOC(r13) /* get kernel TOC in r2 */ > > + > > mfctr r4 /* ftrace_caller has moved local addr here */ > > std r4, 40(r1) > > mflr r3 /* ftrace_caller has restored LR from stack */ > > @@ -1262,6 +1267,9 @@ _GLOBAL(ftrace_graph_caller) > > ld r4, 56(r1) > > ld r3, 48(r1) > > > > + /* Restore callee's TOC */ > > + ld r2, 24(r1) > > + > > addi r1, r1, 112 > > mflr r0 > > std r0, LRSAVE(r1) > > Reviewed-by: Balbir Singh <bsingharora@xxxxxxxxx> Reviewed-by: Torsten Duwe <duwe@xxxxxxx> Torsten -- To unsubscribe from this list: send the line "unsubscribe live-patching" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
