Re: [PATCH 1/1] linux headers: header file(s) changes to enable spinlock use jumplabel

[Raghavendra K T <raghavendra.kt@linux.vnet.ibm.com>]

On 02/21/2012 08:53 PM, Andrew Jones wrote:

[Including people in perf_event and jumplabel also]
> On Mon, Feb 20, 2012 at 11:21:16PM +0530, Raghavendra K T wrote:
>
> Below is the patch I wrote when I first proposed the idea to
> Gleb. This patch isn't exactly what I stated above, because
> it's splitting original and ratelimit, rather than minimal and
> extended. Maybe this is sufficient for now? Or maybe we don't
> want to split at all?
>

IMHO, This patch is sufficient and makes lot more sense than my patches.
I verified and compile tested this with rebased patches of Jeremy
(yesconfig).
Can add
Reviewed-By: Raghavendra K T<raghavendra.kt@linux.vnet.ibm.com>

Peter, Jason, Ingo, please let's know if you have any objection with
below patch..

> Drew
>
> ---
>
> From: Andrew Jones<drjones@redhat.com>
> Date: Thu, 26 Jan 2012 13:59:30 +0100
> Subject: [PATCH] split out rate limiting from jump_label.h
>
> Commit b202952075f62603bea9bfb6ebc6b0420db11949 introduced rate limiting
> for jump label disabling. The changes were made in the jump label code
> in order to be more widely available and to keep things tidier. This is
> all fine, except now jump_label.h includes linux/workqueue.h, which
> makes it impossible to include jump_label.h from anything that
> workqueue.h needs. For example, it's now impossible to include
> jump_label.h from asm/spinlock.h, which was done in Jeremy's proposed
> pv-ticketlock patches. This patch splits out the rate limiting related
> changes from jump_label.h into a new file, jump_label_ratelimit.h, to
> resolve the issue.
>
> Signed-off-by: Andrew Jones<drjones@redhat.com>
> ---
>   include/linux/jump_label.h           |   24 ------------------------
>   include/linux/jump_label_ratelimit.h |   32 ++++++++++++++++++++++++++++++++
>   include/linux/perf_event.h           |    2 +-
>   kernel/jump_label.c                  |    2 +-
>   4 files changed, 34 insertions(+), 26 deletions(-)
>   create mode 100644 include/linux/jump_label_ratelimit.h
>
> diff --git a/include/linux/jump_label.h b/include/linux/jump_label.h
> index 5ce8b14..b15954a 100644
> --- a/include/linux/jump_label.h
> +++ b/include/linux/jump_label.h
> @@ -3,7 +3,6 @@
>
>   #include<linux/types.h>
>   #include<linux/compiler.h>
> -#include<linux/workqueue.h>
>
>   #if defined(CC_HAVE_ASM_GOTO)&&  defined(CONFIG_JUMP_LABEL)
>
> @@ -15,12 +14,6 @@ struct jump_label_key {
>   #endif
>   };
>
> -struct jump_label_key_deferred {
> -	struct jump_label_key key;
> -	unsigned long timeout;
> -	struct delayed_work work;
> -};
> -
>   # include<asm/jump_label.h>
>   # define HAVE_JUMP_LABEL
>   #endif	/* CC_HAVE_ASM_GOTO&&  CONFIG_JUMP_LABEL */
> @@ -58,11 +51,8 @@ extern void arch_jump_label_transform_static(struct jump_entry *entry,
>   extern int jump_label_text_reserved(void *start, void *end);
>   extern void jump_label_inc(struct jump_label_key *key);
>   extern void jump_label_dec(struct jump_label_key *key);
> -extern void jump_label_dec_deferred(struct jump_label_key_deferred *key);
>   extern bool jump_label_enabled(struct jump_label_key *key);
>   extern void jump_label_apply_nops(struct module *mod);
> -extern void jump_label_rate_limit(struct jump_label_key_deferred *key,
> -		unsigned long rl);
>
>   #else  /* !HAVE_JUMP_LABEL */
>
> @@ -78,10 +68,6 @@ static __always_inline void jump_label_init(void)
>   {
>   }
>
> -struct jump_label_key_deferred {
> -	struct jump_label_key  key;
> -};
> -
>   static __always_inline bool static_branch(struct jump_label_key *key)
>   {
>   	if (unlikely(atomic_read(&key->enabled)))
> @@ -99,11 +85,6 @@ static inline void jump_label_dec(struct jump_label_key *key)
>   	atomic_dec(&key->enabled);
>   }
>
> -static inline void jump_label_dec_deferred(struct jump_label_key_deferred *key)
> -{
> -	jump_label_dec(&key->key);
> -}
> -
>   static inline int jump_label_text_reserved(void *start, void *end)
>   {
>   	return 0;
> @@ -121,11 +102,6 @@ static inline int jump_label_apply_nops(struct module *mod)
>   {
>   	return 0;
>   }
> -
> -static inline void jump_label_rate_limit(struct jump_label_key_deferred *key,
> -		unsigned long rl)
> -{
> -}
>   #endif	/* HAVE_JUMP_LABEL */
>
>   #define jump_label_key_enabled	((struct jump_label_key){ .enabled = ATOMIC_INIT(1), })
> diff --git a/include/linux/jump_label_ratelimit.h b/include/linux/jump_label_ratelimit.h
> new file mode 100644
> index 0000000..2cf61b9
> --- /dev/null
> +++ b/include/linux/jump_label_ratelimit.h
> @@ -0,0 +1,32 @@
> +#ifndef _LINUX_JUMP_LABEL_RATELIMIT_H
> +#define _LINUX_JUMP_LABEL_RATELIMIT_H
> +
> +#include<linux/jump_label.h>
> +#include<linux/workqueue.h>
> +
> +#if defined(CC_HAVE_ASM_GOTO)&&  defined(CONFIG_JUMP_LABEL)
> +struct jump_label_key_deferred {
> +	struct jump_label_key key;
> +	unsigned long timeout;
> +	struct delayed_work work;
> +};
> +#endif
> +
> +#ifdef HAVE_JUMP_LABEL
> +extern void jump_label_dec_deferred(struct jump_label_key_deferred *key);
> +extern void jump_label_rate_limit(struct jump_label_key_deferred *key,
> +		unsigned long rl);
> +#else
> +struct jump_label_key_deferred {
> +	struct jump_label_key  key;
> +};
> +static inline void jump_label_dec_deferred(struct jump_label_key_deferred *key)
> +{
> +	jump_label_dec(&key->key);
> +}
> +static inline void jump_label_rate_limit(struct jump_label_key_deferred *key,
> +		unsigned long rl)
> +{
> +}
> +#endif
> +#endif	/* _LINUX_JUMP_LABEL_RATELIMIT_H */
> diff --git a/include/linux/perf_event.h b/include/linux/perf_event.h
> index 0885561..7ae33d9 100644
> --- a/include/linux/perf_event.h
> +++ b/include/linux/perf_event.h
> @@ -512,7 +512,7 @@ struct perf_guest_info_callbacks {
>   #include<linux/ftrace.h>
>   #include<linux/cpu.h>
>   #include<linux/irq_work.h>
> -#include<linux/jump_label.h>
> +#include<linux/jump_label_ratelimit.h>
>   #include<linux/atomic.h>
>   #include<asm/local.h>
>
> diff --git a/kernel/jump_label.c b/kernel/jump_label.c
> index 01d3b70..f736308 100644
> --- a/kernel/jump_label.c
> +++ b/kernel/jump_label.c
> @@ -12,7 +12,7 @@
>   #include<linux/slab.h>
>   #include<linux/sort.h>
>   #include<linux/err.h>
> -#include<linux/jump_label.h>
> +#include<linux/jump_label_ratelimit.h>
>
>   #ifdef HAVE_JUMP_LABEL
>