Re: [PATCH RT 03/10] random: avoid preempt_disable()ed section

[Steven Rostedt]

On Fri, 24 Nov 2017 14:26:40 +0800
Alex Shi <alex....@linaro.org> wrote:

> Hi Steve,
> 
> I just build the patches, a build error found here:
> 
> drivers/char/random.c: In function ‘get_random_int’:
> drivers/char/random.c:1816:7: error: assignment from incompatible
> pointer type [-Werror=incompatible-pointer-types]
>   hash = &get_locked_var(hash_entropy_int_lock, get_random_int_hash);
>        ^
> drivers/char/random.c: In function ‘get_random_long’:
> drivers/char/random.c:1838:7: error: assignment from incompatible
> pointer type [-Werror=incompatible-pointer-types]
>   hash = &get_locked_var(hash_entropy_int_lock, get_random_int_hash);
>        ^
> 
> > -   hash = get_cpu_var(get_random_int_hash);
> > +   hash = &get_locked_var(hash_entropy_int_lock, get_random_int_hash);  
>                ^
> Is this a extra '&' which need to remove?
> 
> >  
> >     hash[0] += current->pid + jiffies + random_get_entropy();
> >     md5_transform(hash, random_int_secret);
> >     ret = hash[0];
> > -   put_cpu_var(get_random_int_hash);
> > +   put_locked_var(hash_entropy_int_lock, get_random_int_hash);
> >  
> >     return ret;
> >  }
> > @@ -1833,12 +1835,12 @@ unsigned long get_random_long(void)
> >     if (arch_get_random_long(&ret))
> >             return ret;
> >  
> > -   hash = get_cpu_var(get_random_int_hash);
> > +   hash = &get_locked_var(hash_entropy_int_lock, get_random_int_hash);  
>                ^
> Ditto

Thanks! I made the following update. I forgot to check for warnings in
the build. :-/

-- Steve

diff --git a/drivers/char/random.c b/drivers/char/random.c
index b41745c5962c..46c0e27cf27f 100644
--- a/drivers/char/random.c
+++ b/drivers/char/random.c
@@ -1813,7 +1813,7 @@ unsigned int get_random_int(void)
        if (arch_get_random_int(&ret))
                return ret;
 
-       hash = &get_locked_var(hash_entropy_int_lock, get_random_int_hash);
+       hash = get_locked_var(hash_entropy_int_lock, get_random_int_hash);
 
        hash[0] += current->pid + jiffies + random_get_entropy();
        md5_transform(hash, random_int_secret);
@@ -1835,7 +1835,7 @@ unsigned long get_random_long(void)
        if (arch_get_random_long(&ret))
                return ret;
 
-       hash = &get_locked_var(hash_entropy_int_lock, get_random_int_hash);
+       hash = get_locked_var(hash_entropy_int_lock, get_random_int_hash);
 
        hash[0] += current->pid + jiffies + random_get_entropy();
        md5_transform(hash, random_int_secret);