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authorLinus Torvalds <torvalds@linux-foundation.org>2012-04-12 05:56:28 +0200
committerLinus Torvalds <torvalds@linux-foundation.org>2012-04-12 05:56:28 +0200
commit45852766a0212c2d4f0d7faa71eedbd6c1d70452 (patch)
tree52d7087c519e01c5ff488c7d191c7307168f6937 /arch/powerpc
parentMerge tag 'rdma-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/r... (diff)
parentpowerpc: Fix typo in runlatch code (diff)
downloadlinux-45852766a0212c2d4f0d7faa71eedbd6c1d70452.tar.xz
linux-45852766a0212c2d4f0d7faa71eedbd6c1d70452.zip
Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
Pull powerpc fixes from Benjamin Herrenschmidt: "Fixes for two nasty regression affecting powerpc in 3.4." * 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc: powerpc: Fix typo in runlatch code powerpc: Fix page fault with lockdep regression
Diffstat (limited to 'arch/powerpc')
-rw-r--r--arch/powerpc/kernel/entry_32.S39
-rw-r--r--arch/powerpc/kernel/process.c4
2 files changed, 23 insertions, 20 deletions
diff --git a/arch/powerpc/kernel/entry_32.S b/arch/powerpc/kernel/entry_32.S
index 3e57a00b8cba..ba3aeb4bc06a 100644
--- a/arch/powerpc/kernel/entry_32.S
+++ b/arch/powerpc/kernel/entry_32.S
@@ -206,40 +206,43 @@ reenable_mmu: /* re-enable mmu so we can */
andi. r10,r10,MSR_EE /* Did EE change? */
beq 1f
- /* Save handler and return address into the 2 unused words
- * of the STACK_FRAME_OVERHEAD (sneak sneak sneak). Everything
- * else can be recovered from the pt_regs except r3 which for
- * normal interrupts has been set to pt_regs and for syscalls
- * is an argument, so we temporarily use ORIG_GPR3 to save it
- */
- stw r9,8(r1)
- stw r11,12(r1)
- stw r3,ORIG_GPR3(r1)
/*
* The trace_hardirqs_off will use CALLER_ADDR0 and CALLER_ADDR1.
* If from user mode there is only one stack frame on the stack, and
* accessing CALLER_ADDR1 will cause oops. So we need create a dummy
* stack frame to make trace_hardirqs_off happy.
+ *
+ * This is handy because we also need to save a bunch of GPRs,
+ * r3 can be different from GPR3(r1) at this point, r9 and r11
+ * contains the old MSR and handler address respectively,
+ * r4 & r5 can contain page fault arguments that need to be passed
+ * along as well. r12, CCR, CTR, XER etc... are left clobbered as
+ * they aren't useful past this point (aren't syscall arguments),
+ * the rest is restored from the exception frame.
*/
+ stwu r1,-32(r1)
+ stw r9,8(r1)
+ stw r11,12(r1)
+ stw r3,16(r1)
+ stw r4,20(r1)
+ stw r5,24(r1)
andi. r12,r12,MSR_PR
- beq 11f
- stwu r1,-16(r1)
+ b 11f
bl trace_hardirqs_off
- addi r1,r1,16
b 12f
-
11:
bl trace_hardirqs_off
12:
+ lwz r5,24(r1)
+ lwz r4,20(r1)
+ lwz r3,16(r1)
+ lwz r11,12(r1)
+ lwz r9,8(r1)
+ addi r1,r1,32
lwz r0,GPR0(r1)
- lwz r3,ORIG_GPR3(r1)
- lwz r4,GPR4(r1)
- lwz r5,GPR5(r1)
lwz r6,GPR6(r1)
lwz r7,GPR7(r1)
lwz r8,GPR8(r1)
- lwz r9,8(r1)
- lwz r11,12(r1)
1: mtctr r11
mtlr r9
bctr /* jump to handler */
diff --git a/arch/powerpc/kernel/process.c b/arch/powerpc/kernel/process.c
index f88698c0f332..4937c9690090 100644
--- a/arch/powerpc/kernel/process.c
+++ b/arch/powerpc/kernel/process.c
@@ -1235,7 +1235,7 @@ void __ppc64_runlatch_on(void)
ctrl |= CTRL_RUNLATCH;
mtspr(SPRN_CTRLT, ctrl);
- ti->local_flags |= TLF_RUNLATCH;
+ ti->local_flags |= _TLF_RUNLATCH;
}
/* Called with hard IRQs off */
@@ -1244,7 +1244,7 @@ void __ppc64_runlatch_off(void)
struct thread_info *ti = current_thread_info();
unsigned long ctrl;
- ti->local_flags &= ~TLF_RUNLATCH;
+ ti->local_flags &= ~_TLF_RUNLATCH;
ctrl = mfspr(SPRN_CTRLF);
ctrl &= ~CTRL_RUNLATCH;