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Steffen Rumler 3c75296562 powerpc: Fix kernel panic during kernel module load ... This fixes a problem which can causes kernel oopses while loading a kernel module. According to the PowerPC EABI specification, GPR r11 is assigned the dedicated function to point to the previous stack frame. In the powerpc-specific kernel module loader, do_plt_call() (in arch/powerpc/kernel/module_32.c), GPR r11 is also used to generate trampoline code. This combination crashes the kernel, in the case where the compiler chooses to use a helper function for saving GPRs on entry, and the module loader has placed the .init.text section far away from the .text section, meaning that it has to generate a trampoline for functions in the .init.text section to call the GPR save helper. Because the trampoline trashes r11, references to the stack frame using r11 can cause an oops. The fix just uses GPR r12 instead of GPR r11 for generating the trampoline code. According to the statements from Freescale, this is safe from an EABI perspective. I've tested the fix for kernel 2.6.33 on MPC8541. Cc: stable@vger.kernel.org Signed-off-by: Steffen Rumler <steffen.rumler.ext@nsn.com> [paulus@samba.org: reworded the description] Signed-off-by: Paul Mackerras <paulus@samba.org>		13 years ago
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boot	arm-soc: driver specific updates	13 years ago
configs	Sound updates for 3.5-rc1	13 years ago
include/asm	powerpc: Fix size of st_nlink on 64bit	13 years ago
kernel	powerpc: Fix kernel panic during kernel module load	13 years ago
kvm	Merge branch 'next' of git://git.kernel.org/pub/scm/virt/kvm/kvm	13 years ago
lib	powerpc: Use the new generic strncpy_from_user() and strnlen_user()	13 years ago
math-emu	…
mm	powerpc: use clear_tasks_mm_cpumask()	13 years ago
net	bpf jit: Let the powerpc jit handle negative offsets	13 years ago
oprofile	Disintegrate asm/system.h for PowerPC	13 years ago
perf	perf: Pass last sampling period to perf_sample_data_init()	13 years ago
platforms	avoid iput() from flusher thread	13 years ago
sysdev	Merge remote-tracking branch 'jwb/next' into next	13 years ago
xmon	Disintegrate and delete asm/system.h	13 years ago
Kconfig	powerpc: Use the new generic strncpy_from_user() and strnlen_user()	13 years ago
Kconfig.debug	irqdomain: Remove powerpc dependency from debugfs file	13 years ago
Makefile	powerpc/crypto: Build files for the nx device driver	13 years ago
relocs_check.pl	powerpc: Process dynamic relocations for kernel	13 years ago