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parisc: Static initialization of spinlocks in perf and unwind code
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While testing UBSAN I saw this BUG:
 BUG: spinlock bad magic on CPU#0, swapper/0
in unwind code. Let's avoid that by static initialization.

Signed-off-by: Helge Deller <deller@gmx.de>
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Helge Deller committed Aug 22, 2017
1 parent 54ac8fc commit 76cffeb
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Showing 2 changed files with 2 additions and 6 deletions.
4 changes: 1 addition & 3 deletions arch/parisc/kernel/perf.c
Original file line number Diff line number Diff line change
Expand Up @@ -69,7 +69,7 @@ struct rdr_tbl_ent {

static int perf_processor_interface __read_mostly = UNKNOWN_INTF;
static int perf_enabled __read_mostly;
static spinlock_t perf_lock;
static DEFINE_SPINLOCK(perf_lock);
struct parisc_device *cpu_device __read_mostly;

/* RDRs to write for PCX-W */
Expand Down Expand Up @@ -533,8 +533,6 @@ static int __init perf_init(void)
/* Patch the images to match the system */
perf_patch_images();

spin_lock_init(&perf_lock);

/* TODO: this only lets us access the first cpu.. what to do for SMP? */
cpu_device = per_cpu(cpu_data, 0).dev;
printk("Performance monitoring counters enabled for %s\n",
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4 changes: 1 addition & 3 deletions arch/parisc/kernel/unwind.c
Original file line number Diff line number Diff line change
Expand Up @@ -34,7 +34,7 @@
extern struct unwind_table_entry __start___unwind[];
extern struct unwind_table_entry __stop___unwind[];

static spinlock_t unwind_lock;
static DEFINE_SPINLOCK(unwind_lock);
/*
* the kernel unwind block is not dynamically allocated so that
* we can call unwind_init as early in the bootup process as
Expand Down Expand Up @@ -181,8 +181,6 @@ int __init unwind_init(void)
start = (long)&__start___unwind[0];
stop = (long)&__stop___unwind[0];

spin_lock_init(&unwind_lock);

printk("unwind_init: start = 0x%lx, end = 0x%lx, entries = %lu\n",
start, stop,
(stop - start) / sizeof(struct unwind_table_entry));
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