linux/arch/powerpc
Josh Poimboeuf b9eab08d01 powerpc/modules: Don't try to restore r2 after a sibling call
When attempting to load a livepatch module, I got the following error:

  module_64: patch_module: Expect noop after relocate, got 3c820000

The error was triggered by the following code in
unregister_netdevice_queue():

  14c:   00 00 00 48     b       14c <unregister_netdevice_queue+0x14c>
                         14c: R_PPC64_REL24      net_set_todo
  150:   00 00 82 3c     addis   r4,r2,0

GCC didn't insert a nop after the branch to net_set_todo() because it's
a sibling call, so it never returns.  The nop isn't needed after the
branch in that case.

Signed-off-by: Josh Poimboeuf <jpoimboe@redhat.com>
Acked-by: Naveen N. Rao <naveen.n.rao@linux.vnet.ibm.com>
Reviewed-and-tested-by: Kamalesh Babulal <kamalesh@linux.vnet.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
2017-12-11 13:03:29 +11:00
..
boot powerpc updates for 4.15 2017-11-16 12:47:46 -08:00
configs powerpc/configs: Enable I2C_CHARDEV for pseries and powernv 2017-10-22 12:08:31 +02:00
crypto License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
include powerpc/modules: Don't try to restore r2 after a sibling call 2017-12-11 13:03:29 +11:00
kernel powerpc/modules: Don't try to restore r2 after a sibling call 2017-12-11 13:03:29 +11:00
kvm * x86 bugfixes: APIC, nested virtualization, IOAPIC 2017-11-30 08:15:19 -08:00
lib powerpc/modules: Don't try to restore r2 after a sibling call 2017-12-11 13:03:29 +11:00
math-emu License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
mm powerpc: Use pr_warn instead of pr_warning 2017-12-04 11:54:34 +11:00
net powerpc updates for 4.15 2017-11-16 12:47:46 -08:00
oprofile treewide: setup_timer() -> timer_setup() 2017-11-21 15:57:07 -08:00
perf powerpc fixes for 4.15 #2 2017-11-24 19:40:12 -10:00
platforms powerpc: Reduce log level of "OPAL detected !" message 2017-12-11 13:03:28 +11:00
purgatory License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
sysdev powerpc: Use pr_warn instead of pr_warning 2017-12-04 11:54:34 +11:00
tools License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
xmon powerpc updates for 4.15 2017-11-16 12:47:46 -08:00
Kconfig powerpc updates for 4.15 2017-11-16 12:47:46 -08:00
Kconfig.debug powerpc updates for 4.15 2017-11-16 12:47:46 -08:00
Makefile Merge branch 'fixes' into next 2017-08-23 22:20:10 +10:00
Makefile.postlink License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00