diff options
| author |   Christophe Leroy <christophe.leroy@csgroup.eu> | 2022-02-15 19:31:22 +0100 |
|---|---|---|
| committer |   Michael Ellerman <mpe@ellerman.id.au> | 2022-02-16 23:09:47 +1100 |
| commit | 34d8dac807f0ee3dc42ab45bdb284a3caf2b5ed1 (patch) | |
| tree | e321e9b4f16e6b6049af04dd4ec9a6caac76b8c5 | |
| parent | powerpc/boot: Add `otheros-too-big.bld` to .gitignore (diff) | |
powerpc/ftrace: Also save r1 in ftrace_caller()
Also save r1 in ftrace_caller()
r1 is needed during unwinding when the function_graph tracer
is active.
Fixes: 830213786c49 ("powerpc/ftrace: directly call of function graph tracer by ftrace caller")
Reported-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/ff535e86d3a69376a6d89168511d4e403835f18b.1644949750.git.christophe.leroy@csgroup.eu
| -rw-r--r-- | arch/powerpc/kernel/trace/ftrace_mprofile.S | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/arch/powerpc/kernel/trace/ftrace_mprofile.S b/arch/powerpc/kernel/trace/ftrace_mprofile.S index 56da60e98327..8443902d5a05 100644 --- a/arch/powerpc/kernel/trace/ftrace_mprofile.S +++ b/arch/powerpc/kernel/trace/ftrace_mprofile.S @@ -173,6 +173,10 @@ _GLOBAL(ftrace_caller) beq ftrace_no_trace #endif + /* Save previous stack pointer (r1) */ + addi r8, r1, SWITCH_FRAME_SIZE + PPC_STL r8, GPR1(r1) + /* Get the _mcount() call site out of LR */ mflr r7 PPC_STL r7, _NIP(r1) |