https://github.com/torvalds/linux
Revision 6593178dd46d64a5bcb0402a4f3acd95b0687abd authored by James Bottomley on 18 November 2005, 22:13:33 UTC, committed by Bartlomiej Zolnierkiewicz on 18 November 2005, 22:13:33 UTC
The following patch fixes a crash caused by attempting to bounce buffer when an IDE CD-ROM is used on a machine with an IO-MMU. [At least, this patch fixes things so I can use my IDE CD-ROM behind an ns87415 on a HP PA-RISC workstation.] Signed-off-by: James Bottomley <jejb@parisc-linux.org> Signed-off-by: Kyle McMartin <kyle@parisc-linux.org> Signed-off-by: Bartlomiej Zolnierkiewicz <bzolnier@gmail.com>
1 parent c37ea21
Tip revision: 6593178dd46d64a5bcb0402a4f3acd95b0687abd authored by James Bottomley on 18 November 2005, 22:13:33 UTC
[PATCH] ide: fix ide_toggle_bounce() to not try to bounce if we have an IOMMU
[PATCH] ide: fix ide_toggle_bounce() to not try to bounce if we have an IOMMU
Tip revision: 6593178
smp_processor_id.c
/*
* lib/smp_processor_id.c
*
* DEBUG_PREEMPT variant of smp_processor_id().
*/
#include <linux/module.h>
#include <linux/kallsyms.h>
#include <linux/sched.h>
unsigned int debug_smp_processor_id(void)
{
unsigned long preempt_count = preempt_count();
int this_cpu = raw_smp_processor_id();
cpumask_t this_mask;
if (likely(preempt_count))
goto out;
if (irqs_disabled())
goto out;
/*
* Kernel threads bound to a single CPU can safely use
* smp_processor_id():
*/
this_mask = cpumask_of_cpu(this_cpu);
if (cpus_equal(current->cpus_allowed, this_mask))
goto out;
/*
* It is valid to assume CPU-locality during early bootup:
*/
if (system_state != SYSTEM_RUNNING)
goto out;
/*
* Avoid recursion:
*/
preempt_disable();
if (!printk_ratelimit())
goto out_enable;
printk(KERN_ERR "BUG: using smp_processor_id() in preemptible [%08x] code: %s/%d\n", preempt_count(), current->comm, current->pid);
print_symbol("caller is %s\n", (long)__builtin_return_address(0));
dump_stack();
out_enable:
preempt_enable_no_resched();
out:
return this_cpu;
}
EXPORT_SYMBOL(debug_smp_processor_id);
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