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ARM: hw_breakpoint: fix warnings generated by sparse

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sparse doesn't like per-cpu accesses such as:

static DEFINE_PER_CPU(struct perf_event *, foo[MAXLEN]);
struct perf_event **bar = __get_cpu_var(foo);

and shouts quite loudly about it:

| warning: incorrect type in assignment (different modifiers)
|    expected struct perf_event **slots
|    got struct perf_event *[noderef] *<noident>

This patch adds casts to these sorts of assignments in hw_breakpoint.c
in order to silence the warnings.

Reported-by: Russell King <rmk+kernel@arm.linux.org.uk>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2010-11-29 17:06:53 +00:00
parent ce9b1b0952
commit 4a55c18e20
1 changed files with 13 additions and 7 deletions
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20
arch/arm/kernel/hw_breakpoint.c
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@ -337,7 +337,7 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
/* Breakpoint */
ctrl_base = ARM_BASE_BCR;
val_base = ARM_BASE_BVR;
slots = __get_cpu_var(bp_on_reg);
slots = (struct perf_event **)__get_cpu_var(bp_on_reg);
max_slots = core_num_brps;
if (info->step_ctrl.enabled) {
/* Override the breakpoint data with the step data. */
@ -357,7 +357,7 @@ int arch_install_hw_breakpoint(struct perf_event *bp)
ctrl_base = ARM_BASE_WCR;
val_base = ARM_BASE_WVR;
}
slots = __get_cpu_var(wp_on_reg);
slots = (struct perf_event **)__get_cpu_var(wp_on_reg);
max_slots = core_num_wrps;
}
@ -394,7 +394,7 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
if (info->ctrl.type == ARM_BREAKPOINT_EXECUTE) {
/* Breakpoint */
base = ARM_BASE_BCR;
slots = __get_cpu_var(bp_on_reg);
slots = (struct perf_event **)__get_cpu_var(bp_on_reg);
max_slots = core_num_brps;
} else {
/* Watchpoint */
@ -402,7 +402,7 @@ void arch_uninstall_hw_breakpoint(struct perf_event *bp)
base = ARM_BASE_BCR + core_num_brps;
else
base = ARM_BASE_WCR;
slots = __get_cpu_var(wp_on_reg);
slots = (struct perf_event **)__get_cpu_var(wp_on_reg);
max_slots = core_num_wrps;
}
@ -662,9 +662,11 @@ static void disable_single_step(struct perf_event *bp)
static void watchpoint_handler(unsigned long unknown, struct pt_regs *regs)
{
int i;
struct perf_event *wp, **slots = __get_cpu_var(wp_on_reg);
struct perf_event *wp, **slots;
struct arch_hw_breakpoint *info;
slots = (struct perf_event **)__get_cpu_var(wp_on_reg);
/* Without a disassembler, we can only handle 1 watchpoint. */
BUG_ON(core_num_wrps > 1);
@ -703,9 +705,11 @@ static void watchpoint_handler(unsigned long unknown, struct pt_regs *regs)
static void watchpoint_single_step_handler(unsigned long pc)
{
int i;
struct perf_event *wp, **slots = __get_cpu_var(wp_on_reg);
struct perf_event *wp, **slots;
struct arch_hw_breakpoint *info;
slots = (struct perf_event **)__get_cpu_var(wp_on_reg);
for (i = 0; i < core_num_reserved_brps; ++i) {
rcu_read_lock();
@ -734,10 +738,12 @@ static void breakpoint_handler(unsigned long unknown, struct pt_regs *regs)
{
int i;
u32 ctrl_reg, val, addr;
struct perf_event *bp, **slots = __get_cpu_var(bp_on_reg);
struct perf_event *bp, **slots;
struct arch_hw_breakpoint *info;
struct arch_hw_breakpoint_ctrl ctrl;
slots = (struct perf_event **)__get_cpu_var(bp_on_reg);
/* The exception entry code places the amended lr in the PC. */
addr = regs->ARM_pc;