diff options
| author | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-14 12:26:23 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2012-01-14 12:26:23 -0800 |
| commit | 8e63dd6e1c589ba99a18df9cbaa41c3178607641 (patch) | |
| tree | e1662280bb1d8227e767c877c1f06c74ec5c40bc /arch/powerpc/platforms | |
| parent | f88609a0e447fb73851c0f640ed47257838ff99f (diff) | |
| parent | ebb7f616abf6ee11603e6b63aa6c5f84c80a17d0 (diff) | |
Merge branch 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc
* 'merge' of git://git.kernel.org/pub/scm/linux/kernel/git/benh/powerpc:
powerpc: Fix unpaired __trace_hcall_entry and __trace_hcall_exit
powerpc: Fix RCU idle and hcall tracing
Diffstat (limited to 'arch/powerpc/platforms')
| -rw-r--r-- | arch/powerpc/platforms/pseries/hvCall.S | 3 | ||||
| -rw-r--r-- | arch/powerpc/platforms/pseries/lpar.c | 14 |
2 files changed, 12 insertions, 5 deletions
diff --git a/arch/powerpc/platforms/pseries/hvCall.S b/arch/powerpc/platforms/pseries/hvCall.S index fd05fdee576a..3ce73d0052b1 100644 --- a/arch/powerpc/platforms/pseries/hvCall.S +++ b/arch/powerpc/platforms/pseries/hvCall.S @@ -36,6 +36,7 @@ BEGIN_FTR_SECTION; \ b 1f; \ END_FTR_SECTION(0, 1); \ ld r12,hcall_tracepoint_refcount@toc(r2); \ + std r12,32(r1); \ cmpdi r12,0; \ beq+ 1f; \ mflr r0; \ @@ -74,7 +75,7 @@ END_FTR_SECTION(0, 1); \ BEGIN_FTR_SECTION; \ b 1f; \ END_FTR_SECTION(0, 1); \ - ld r12,hcall_tracepoint_refcount@toc(r2); \ + ld r12,32(r1); \ cmpdi r12,0; \ beq+ 1f; \ mflr r0; \ diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c index 948e0e3b3547..7bc73af6c7b9 100644 --- a/arch/powerpc/platforms/pseries/lpar.c +++ b/arch/powerpc/platforms/pseries/lpar.c @@ -546,6 +546,13 @@ void __trace_hcall_entry(unsigned long opcode, unsigned long *args) unsigned long flags; unsigned int *depth; + /* + * We cannot call tracepoints inside RCU idle regions which + * means we must not trace H_CEDE. + */ + if (opcode == H_CEDE) + return; + local_irq_save(flags); depth = &__get_cpu_var(hcall_trace_depth); @@ -556,8 +563,6 @@ void __trace_hcall_entry(unsigned long opcode, unsigned long *args) (*depth)++; preempt_disable(); trace_hcall_entry(opcode, args); - if (opcode == H_CEDE) - rcu_idle_enter(); (*depth)--; out: @@ -570,6 +575,9 @@ void __trace_hcall_exit(long opcode, unsigned long retval, unsigned long flags; unsigned int *depth; + if (opcode == H_CEDE) + return; + local_irq_save(flags); depth = &__get_cpu_var(hcall_trace_depth); @@ -578,8 +586,6 @@ void __trace_hcall_exit(long opcode, unsigned long retval, goto out; (*depth)++; - if (opcode == H_CEDE) - rcu_idle_exit(); trace_hcall_exit(opcode, retval, retbuf); preempt_enable(); (*depth)--; |