| Message ID | 20220721195509.418205-1-ben-linux@fluff.org (mailing list archive) |
|---|---|
| State | Handled Elsewhere |
| Headers | show |
| Series | profile: setup_profiling_timer() is moslty not implemented | expand |
On Thu, 21 Jul 2022 20:55:09 +0100 Ben Dooks <ben-linux@fluff.org> wrote: > 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? I'll grab this. We have had some problems with weak functions lately. See https://lore.kernel.org/all/87ee0q7b92.fsf@email.froward.int.ebiederm.org/T/#u Hopefully that was a rare corner case.
On 25/07/2022 20:39, Andrew Morton wrote: > On Thu, 21 Jul 2022 20:55:09 +0100 Ben Dooks <ben-linux@fluff.org> wrote: > >> 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? > > I'll grab this. > > We have had some problems with weak functions lately. See > > https://lore.kernel.org/all/87ee0q7b92.fsf@email.froward.int.ebiederm.org/T/#u > > Hopefully that was a rare corner case. Great, thanks.
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;
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(-)