linux-kernel - Re: [PATCH] x86: io-apic - get rid of __DO

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]

Date:	Wed, 10 Sep 2008 10:30:39 -0700
From:	"Yinghai Lu" <yhlu.kernel@...il.com>
To:	"Ingo Molnar" <mingo@...e.hu>
Cc:	"Cyrill Gorcunov" <gorcunov@...il.com>,
	"H. Peter Anvin" <hpa@...or.com>,
	"Thomas Gleixner" <tglx@...utronix.de>,
	"Maciej W. Rozycki" <macro@...ux-mips.org>,
	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: io-apic - get rid of __DO_ACTION macro

On Wed, Sep 10, 2008 at 2:31 AM, Ingo Molnar <mingo@...e.hu> wrote:
>
> * Yinghai Lu <yhlu.kernel@...il.com> wrote:
>
>> On Tue, Sep 9, 2008 at 11:02 PM, Cyrill Gorcunov <gorcunov@...il.com> wrote:
>> > On Wed, Sep 10, 2008 at 12:13 AM, Yinghai Lu <yhlu.kernel@...il.com> wrote:
>> > ...
>> >>
>> >> hope we can keep using MACRO..
>> >>
>> >> YH
>> >>
>> >
>> > Btw, Yinghai, what does it mean? To not touch this macro at all?
>> > Or you mean about implementation issue (ie the design itself)?
>>
>> do not touch this macro... and may revisit after 2.6.28
>
> anything you are particularly worried about? Regressions we should be
> able to find pretty quickly, in a central macro like that - and the
> macro is quite ugly.
>

ok, let remove unneeded "if", and use function pointer...

void (*extra_action_t)(struct irq_pin_list *entry);

+static inline void io_apic_modify_irq(unsigned int irq,
+                               int mask_and, int mask_or,
+                               int mask_and_not, extra_action_t action)
+{
+       int pin;
+       struct irq_cfg *cfg;
+       struct irq_pin_list *entry;
+       cfg = irq_cfg(irq);
+       for (entry = cfg->irq_2_pin; entry != NULL; entry = entry->next) {
+               unsigned int reg;
+               pin = entry->pin;
+               reg = io_apic_read(entry->apic, 0x10 + pin * 2);
+               reg &= mask_and;
+               reg |= mask_or;
+               reg &= ~mask_and_not;
+               io_apic_modify(entry->apic, 0x10 + pin * 2, reg);
+               if (action)
+                       action(entry);
+       }
+}

+void extra_read(struct irq_pin_list *entry)
+             {
+                       /*
+                        * Synchronize the IO-APIC and the CPU by doing
+                        * a dummy read from the IO-APIC
+                        */
+                       struct io_apic __iomem *io_apic;
+                       io_apic = io_apic_base(entry->apic);
+                       readl(&io_apic->data);
+               }


YH
--
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/