[PATCH] profile: setup_profiling_timer() is moslty not implemented

Ben Dooks
2022-07-21T19:55:09Z

The setup_profiling_timer() is mostly un-implemented by many
architectures. In many places it isn't guarded by CONFIG_PROFILE
which is needed for it to be used. Make it a weak symbol in
kernel/profile.c and remove the 'return -EINVAL' implementations
from the kenrel.

There are a couple of architectures which do return 0 from
the setup_profiling_timer() function but they don't seem to
do anything else with it. To keep the /proc compatibility for
now, leave these for a future update or removal.

On ARM, this fixes the following sparse warning:
arch/arm/kernel/smp.c:793:5: warning: symbol 'setup_profiling_timer' was not declared. Should it be static?

Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
arch/alpha/kernel/smp.c | 6 ------
arch/arc/kernel/smp.c | 8 --------
arch/arm/kernel/smp.c | 8 --------
arch/arm64/kernel/smp.c | 8 --------
arch/csky/kernel/smp.c | 5 -----
arch/hexagon/kernel/smp.c | 5 -----
arch/ia64/kernel/smp.c | 6 ------
arch/openrisc/kernel/smp.c | 6 ------
arch/parisc/kernel/smp.c | 7 -------
arch/powerpc/kernel/smp.c | 7 -------
arch/riscv/kernel/smp.c | 6 ------
arch/sparc/kernel/smp_32.c | 5 -----
arch/sparc/kernel/smp_64.c | 6 ------
arch/x86/include/asm/apic.h | 2 --
arch/x86/kernel/apic/apic.c | 5 -----
kernel/profile.c | 8 ++++++--
16 files changed, 6 insertions(+), 92 deletions(-)

diff --git a/arch/alpha/kernel/smp.c b/arch/alpha/kernel/smp.c
index cb64e4797d2a..f4e20f75438f 100644
--- a/arch/alpha/kernel/smp.c
+++ b/arch/alpha/kernel/smp.c
@@ -497,12 +497,6 @@ smp_cpus_done(unsigned int max_cpus)
((bogosum + 2500) / (5000/HZ)) % 100);
}

-int
-setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
static void
send_ipi_message(const struct cpumask *to_whom, enum ipi_message_type operation)
{
diff --git a/arch/arc/kernel/smp.c b/arch/arc/kernel/smp.c
index d947473f1e6d..ab9e75e90f72 100644
--- a/arch/arc/kernel/smp.c
+++ b/arch/arc/kernel/smp.c
@@ -232,14 +232,6 @@ int __cpu_up(unsigned int cpu, struct task_struct *idle)
return 0;
}

-/*
- * not supported here
- */
-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
/*****************************************************************************/
/* Inter Processor Interrupt Handling */
/*****************************************************************************/
diff --git a/arch/arm/kernel/smp.c b/arch/arm/kernel/smp.c
index 73fc645fc4c7..978db2d96b44 100644
--- a/arch/arm/kernel/smp.c
+++ b/arch/arm/kernel/smp.c
@@ -787,14 +787,6 @@ void panic_smp_self_stop(void)
cpu_relax();
}

-/*
- * not supported here
- */
-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
#ifdef CONFIG_CPU_FREQ

static DEFINE_PER_CPU(unsigned long, l_p_j_ref);
diff --git a/arch/arm64/kernel/smp.c b/arch/arm64/kernel/smp.c
index 62ed361a4376..ffc5d76cf695 100644
--- a/arch/arm64/kernel/smp.c
+++ b/arch/arm64/kernel/smp.c
@@ -1078,14 +1078,6 @@ bool smp_crash_stop_failed(void)
}
#endif

-/*
- * not supported here
- */
-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
static bool have_cpu_die(void)
{
#ifdef CONFIG_HOTPLUG_CPU
diff --git a/arch/csky/kernel/smp.c b/arch/csky/kernel/smp.c
index 6bb38bc2f39b..4b605aa2e1d6 100644
--- a/arch/csky/kernel/smp.c
+++ b/arch/csky/kernel/smp.c
@@ -243,11 +243,6 @@ void __init smp_cpus_done(unsigned int max_cpus)
{
}

-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
void csky_start_secondary(void)
{
struct mm_struct *mm = &init_mm;
diff --git a/arch/hexagon/kernel/smp.c b/arch/hexagon/kernel/smp.c
index 619c56420aa0..4ba93e59370c 100644
--- a/arch/hexagon/kernel/smp.c
+++ b/arch/hexagon/kernel/smp.c
@@ -240,11 +240,6 @@ void arch_send_call_function_ipi_mask(const struct cpumask *mask)
send_ipi(mask, IPI_CALL_FUNC);
}

-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
void smp_start_cpus(void)
{
int i;
diff --git a/arch/ia64/kernel/smp.c b/arch/ia64/kernel/smp.c
index 7b7b64eb3129..e2cc59db86bc 100644
--- a/arch/ia64/kernel/smp.c
+++ b/arch/ia64/kernel/smp.c
@@ -333,9 +333,3 @@ smp_send_stop (void)
{
send_IPI_allbutself(IPI_CPU_STOP);
}
-
-int
-setup_profiling_timer (unsigned int multiplier)
-{
- return -EINVAL;
-}
diff --git a/arch/openrisc/kernel/smp.c b/arch/openrisc/kernel/smp.c
index 27041db2c8b0..e1419095a6f0 100644
--- a/arch/openrisc/kernel/smp.c
+++ b/arch/openrisc/kernel/smp.c
@@ -197,12 +197,6 @@ void smp_send_stop(void)
smp_call_function(stop_this_cpu, NULL, 0);
}

-/* not supported, yet */
-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
void __init set_smp_cross_call(void (*fn)(const struct cpumask *, unsigned int))
{
smp_cross_call = fn;
diff --git a/arch/parisc/kernel/smp.c b/arch/parisc/kernel/smp.c
index 24d0744c3b3a..7dbd92cafae3 100644
--- a/arch/parisc/kernel/smp.c
+++ b/arch/parisc/kernel/smp.c
@@ -513,10 +513,3 @@ void __cpu_die(unsigned int cpu)

pdc_cpu_rendezvous_unlock();
}
-
-#ifdef CONFIG_PROC_FS
-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-#endif
diff --git a/arch/powerpc/kernel/smp.c b/arch/powerpc/kernel/smp.c
index bcefab484ea6..c037c26540dd 100644
--- a/arch/powerpc/kernel/smp.c
+++ b/arch/powerpc/kernel/smp.c
@@ -1674,13 +1674,6 @@ void start_secondary(void *unused)
BUG();
}

-#ifdef CONFIG_PROFILING
-int setup_profiling_timer(unsigned int multiplier)
-{
- return 0;
-}
-#endif
-
static void __init fixup_topology(void)
{
int i;
diff --git a/arch/riscv/kernel/smp.c b/arch/riscv/kernel/smp.c
index b5d30ea92292..441d0ceb80ad 100644
--- a/arch/riscv/kernel/smp.c
+++ b/arch/riscv/kernel/smp.c
@@ -64,12 +64,6 @@ bool arch_match_cpu_phys_id(int cpu, u64 phys_id)
return phys_id = cpuid_to_hartid_map(cpu);
}

-/* Unsupported */
-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
static void ipi_stop(void)
{
set_cpu_online(smp_processor_id(), false);
diff --git a/arch/sparc/kernel/smp_32.c b/arch/sparc/kernel/smp_32.c
index 22b148e5a5f8..ad8094d955eb 100644
--- a/arch/sparc/kernel/smp_32.c
+++ b/arch/sparc/kernel/smp_32.c
@@ -174,11 +174,6 @@ void smp_call_function_interrupt(void)
irq_exit();
}

-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
void __init smp_prepare_cpus(unsigned int max_cpus)
{
int i, cpuid, extra;
diff --git a/arch/sparc/kernel/smp_64.c b/arch/sparc/kernel/smp_64.c
index a1f78e9ddaf3..a55295d1b924 100644
--- a/arch/sparc/kernel/smp_64.c
+++ b/arch/sparc/kernel/smp_64.c
@@ -1186,12 +1186,6 @@ void __irq_entry smp_penguin_jailcell(int irq, struct pt_regs *regs)
preempt_enable();
}

-/* /proc/profile writes can call this, don't __init it please. */
-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
void __init smp_prepare_cpus(unsigned int max_cpus)
{
}
diff --git a/arch/x86/include/asm/apic.h b/arch/x86/include/asm/apic.h
index bd8ae0a7010a..3415321c8240 100644
--- a/arch/x86/include/asm/apic.h
+++ b/arch/x86/include/asm/apic.h
@@ -98,8 +98,6 @@ static inline bool apic_from_smp_config(void)
#include <asm/paravirt.h>
#endif

-extern int setup_profiling_timer(unsigned int);
-
static inline void native_apic_mem_write(u32 reg, u32 v)
{
volatile u32 *addr = (volatile u32 *)(APIC_BASE + reg);
diff --git a/arch/x86/kernel/apic/apic.c b/arch/x86/kernel/apic/apic.c
index 189d3a5e471a..df764ceac2c8 100644
--- a/arch/x86/kernel/apic/apic.c
+++ b/arch/x86/kernel/apic/apic.c
@@ -1115,11 +1115,6 @@ DEFINE_IDTENTRY_SYSVEC(sysvec_apic_timer_interrupt)
set_irq_regs(old_regs);
}

-int setup_profiling_timer(unsigned int multiplier)
-{
- return -EINVAL;
-}
-
/*
* Local APIC start and shutdown
*/
diff --git a/kernel/profile.c b/kernel/profile.c
index 37640a0bd8a3..244aa255c488 100644
--- a/kernel/profile.c
+++ b/kernel/profile.c
@@ -418,6 +418,12 @@ read_profile(struct file *file, char __user *buf, size_t count, loff_t *ppos)
return read;
}

+/* default is to not implement this call */
+int __weak setup_profiling_timer(unsigned mult)
+{
+ return -EINVAL;
+}
+
/*
* Writing to /proc/profile resets the counters
*
@@ -428,8 +434,6 @@ static ssize_t write_profile(struct file *file, const char __user *buf,
size_t count, loff_t *ppos)
{
#ifdef CONFIG_SMP
- extern int setup_profiling_timer(unsigned int multiplier);
-
if (count = sizeof(int)) {
unsigned int multiplier;

--
2.35.1