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Christophe Leroy fc75f87337 powerpc/ftrace: Have arch_ftrace_get_regs() return NULL unless FL_SAVE_REGS is set 
When FL_SAVE_REGS is not set we get here via ftrace_caller()
which doesn't save all registers.

ftrace_caller() explicitely clears regs.msr, so we can rely
on it to know where we come from. We don't expect MSR register
to be 0 at all when involving ftrace.

Fixes: 40b035efe288 ("powerpc/ftrace: Implement CONFIG_DYNAMIC_FTRACE_WITH_ARGS")
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/2f9a7e898c93cc7438ef5ccd47cb9c3a9c5b53ef.1644949750.git.christophe.leroy@csgroup.eu
2022-02-16 23:09:47 +11:00
..
alpha
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
arc
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
arm
Tracing fixes for 5.17-rc1:
2022-01-28 19:30:35 +02:00
arm64
arm64 fixes:
2022-01-29 08:57:22 +02:00
csky
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
h8300
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
hexagon
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
ia64
ia64: make IA64_MCA_RECOVERY bool instead of tristate
2022-01-30 09:56:58 +02:00
m68k
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
microblaze
Kbuild updates for v5.17
2022-01-19 11:15:19 +02:00
mips
pci-v5.17-fixes-2
2022-01-29 19:05:47 +02:00
nds32
Kbuild updates for v5.17
2022-01-19 11:15:19 +02:00
nios2
Kbuild updates for v5.17
2022-01-19 11:15:19 +02:00
openrisc
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
parisc
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
powerpc
powerpc/ftrace: Have arch_ftrace_get_regs() return NULL unless FL_SAVE_REGS is set
2022-02-16 23:09:47 +11:00
riscv
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
s390
s390/hypfs: include z/VM guests with access control group set
2022-01-26 18:42:39 +01:00
sh
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
sparc
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
um
virtio,vdpa,qemu_fw_cfg: features, cleanups, fixes
2022-01-18 10:05:48 +02:00
x86
- Add another Intel CPU model to the list of CPUs supporting the
2022-01-30 12:55:06 +02:00
xtensa
bitmap patches for 5.17-rc1
2022-01-23 06:20:44 +02:00
.gitignore
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Kconfig
Merge branch 'akpm' (patches from Andrew)
2022-01-20 10:41:01 +02:00