linux-kernel - Re: [PATCH] Simplify smp_call_function*() by using common implementation

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <460ABF84.5060201@goop.org>
Date:	Wed, 28 Mar 2007 12:18:28 -0700
From:	Jeremy Fitzhardinge <jeremy@...p.org>
To:	Andi Kleen <ak@...e.de>
CC:	Andrew Morton <akpm@...ux-foundation.org>,
	Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
	Virtualization Mailing List <virtualization@...ts.osdl.org>,
	Jan Beulich <jbeulich@...ell.com>,
	Stephane Eranian <eranian@....hp.com>,
	Ingo Molnar <mingo@...e.hu>,
	"Randy.Dunlap" <rdunlap@...otime.net>
Subject: Re: [PATCH] Simplify smp_call_function*() by using common implementation

Andi Kleen wrote:
> On Wednesday 28 March 2007 00:13, Jeremy Fitzhardinge wrote:
>   
>> smp_call_function and smp_call_function_single are almost complete
>> duplicates of the same logic.  This patch combines them by
>> implementing them in terms of the more general
>> smp_call_function_mask().
>>     
>
> I think I got those already.
>   

OK.  Do you have smp_ops and machine_ops?

There's a doc update patch too:

Subject: Fix smp_call_function* docs

As reported by Randy Dunlap <rdunlap@...otime.net>

Signed-off-by: Jeremy Fitzhardinge <jeremy@...source.com>
Cc: Randy Dunlap <rdunlap@...otime.net>

---
 arch/i386/kernel/smp.c |   27 ++++++++++++++++-----------
 1 file changed, 16 insertions(+), 11 deletions(-)

===================================================================
--- a/arch/i386/kernel/smp.c
+++ b/arch/i386/kernel/smp.c
@@ -570,8 +570,10 @@ static int __smp_call_function_mask(cpum
  * @info: An arbitrary pointer to pass to the function.
  * @wait: If true, wait (atomically) until function has completed on other CPUs.
  *
- * Returns 0 on success, else a negative status code. Does not return until
- * remote CPUs are nearly ready to execute <<func>> or are or have finished.
+  * Returns 0 on success, else a negative status code.
+ *
+ * If @wait is true, then returns once @func has returned; otherwise
+ * it returns just before the target cpu calls @func.
  *
  * You must not call this function with disabled interrupts or from a
  * hardware interrupt handler or from a bottom half handler.
@@ -593,11 +595,13 @@ int smp_call_function_mask(cpumask_t mas
  * smp_call_function(): Run a function on all other CPUs.
  * @func: The function to run. This must be fast and non-blocking.
  * @info: An arbitrary pointer to pass to the function.
- * @nonatomic: currently unused.
+ * @nonatomic: Unused.
  * @wait: If true, wait (atomically) until function has completed on other CPUs.
  *
- * Returns 0 on success, else a negative status code. Does not return until
- * remote CPUs are nearly ready to execute <<func>> or are or have executed.
+ * Returns 0 on success, else a negative status code.
+ *
+ * If @wait is true, then returns once @func has returned; otherwise
+ * it returns just before the target cpu calls @func.
  *
  * You must not call this function with disabled interrupts or from a
  * hardware interrupt handler or from a bottom half handler.
@@ -609,17 +613,18 @@ int smp_call_function(void (*func) (void
 }
 EXPORT_SYMBOL(smp_call_function);
 
-/*
+/**
  * smp_call_function_single - Run a function on another CPU
+ * @cpu: The target CPU.  Cannot be the calling CPU.
  * @func: The function to run. This must be fast and non-blocking.
  * @info: An arbitrary pointer to pass to the function.
- * @nonatomic: Currently unused.
+ * @nonatomic: Unused.
  * @wait: If true, wait until function has completed on other CPUs.
  *
- * Retrurns 0 on success, else a negative status code.
- *
- * Does not return until the remote CPU is nearly ready to execute <func>
- * or is or has executed.
+ * Returns 0 on success, else a negative status code.
+ *
+ * If @wait is true, then returns once @func has returned; otherwise
+ * it returns just before the target cpu calls @func.
  */
 int smp_call_function_single(int cpu, void (*func) (void *info), void *info,
 			     int nonatomic, int wait)

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/