Re: [PATCH 1/2] cpufreq: serialize calls to __cpufreq_governor()

["Robert Schöne" <robert.schoene@tu-dresden.de>]

@all:
I have to leave now and will not be available for a week.

@Viresh:
The line you are looking for is 2c8 (260h+68h, length check passed).
Here it is with the surrounding instructions:


static inline void __gov_queue_work(int cpu, struct dbs_data *dbs_data,
                unsigned int delay)
{
        struct cpu_dbs_common_info *cdbs = dbs_data->cdata->get_cpu_cdbs(cpu);
 2c0:   49 8b 06                mov    (%r14),%rax
 2c3:   89 df                   mov    %ebx,%edi
 2c5:   ff 50 20                callq  *0x20(%rax)
/fastfs/rschoene/linux-git/drivers/cpufreq/cpufreq_governor.c:168

        mod_delayed_work_on(cpu, system_wq, &cdbs->work, delay);
 2c8:   48 8b 35 00 00 00 00    mov    0x0(%rip),%rsi        # 2cf <gov_queue_work+0x6f>
                        2cb: R_X86_64_PC32      system_wq-0x4
 2cf:   48 8d 50 30             lea    0x30(%rax),%rdx
 2d3:   4c 89 f9                mov    %r15,%rcx
 2d6:   89 df                   mov    %ebx,%edi
 2d8:   e8 00 00 00 00          callq  2dd <gov_queue_work+0x7d>
                        2d9: R_X86_64_PC32      mod_delayed_work_on-0x4
cpumask_next():
/fastfs/rschoene/linux-git/include/linux/cpumask.h:182 (discriminator 1)
 2dd:   41 83 c4 01             add    $0x1,%r12d
 2e1:   be 00 01 00 00          mov    $0x100,%esi
 2e6:   4c 89 ef                mov    %r13,%rdi
 2e9:   49 63 d4                movslq %r12d,%rdx
 2ec:   e8 00 00 00 00          callq  2f1 <gov_queue_work+0x91>
                        2ed: R_X86_64_PC32      find_next_bit-0x4



> If you are using x86 then simply use objdump, otherwise your toolchain will
> have a command for this..
> 
> Then search for gov_queue_work in this and confirm the length of routine is
> 0xd0 (Came from gov_queue_work+0x68/0xd0) and then tell us what's there
> at 0x68 ...
> 
> Sorry if you already knew all this, just for completeness I am sharing this :)
> 
> If you find some difficulty with this, just attach the file and send it to me +
> let me know what compiler you used, + system architecture.