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x86/acpi: Correct out-of-date comment of __acpi_map_table() 

The implementation of function __acpi_map_table() has been
changed long time ago, and now it directly invokes
early_ioremap() to setup the temporarily acpi table mappings.

So correct its out-of-date comment.

Signed-off-by: Zhang Yanfei <zhangyanfei@cn.fujitsu.com>
Cc: len.brown@intel.com
Cc: pavel@ucw.cz
Cc: rjw@sisk.pl
Link: http://lkml.kernel.org/r/51EE7F1C.9020506@gmail.com
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Zhang Yanfei 2013-07-23 21:03:24 +08:00 committed by Ingo Molnar
parent 3b2f64d00c
commit 45f1330af6
1 changed files with 3 additions and 10 deletions
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13
arch/x86/kernel/acpi/boot.c
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@ -141,16 +141,8 @@ static u32 irq_to_gsi(int irq)
}
/*
* Temporarily use the virtual area starting from FIX_IO_APIC_BASE_END,
* to map the target physical address. The problem is that set_fixmap()
* provides a single page, and it is possible that the page is not
* sufficient.
* By using this area, we can map up to MAX_IO_APICS pages temporarily,
* i.e. until the next __va_range() call.
*
* Important Safety Note: The fixed I/O APIC page numbers are *subtracted*
* from the fixed base. That's why we start at FIX_IO_APIC_BASE_END and
* count idx down while incrementing the phys address.
* This is just a simple wrapper around early_ioremap(),
* with sanity checks for phys == 0 and size == 0.
*/
char *__init __acpi_map_table(unsigned long phys, unsigned long size)
{
@ -160,6 +152,7 @@ char *__init __acpi_map_table(unsigned long phys, unsigned long size)
return early_ioremap(phys, size);
}
void __init __acpi_unmap_table(char *map, unsigned long size)
{
if (!map || !size)