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2d6d9fd3a5
Commit ca9b600be38c ("ACPI / PM: Make suspend_nvs_save() use
acpi_os_map_memory()") attempted to prevent the code in osl.c and nvs.c
from using different ioremap() variants by making the latter use
acpi_os_map_memory() for mapping the NVS pages. However, that also
requires acpi_os_unmap_memory() to be used for unmapping them, which
causes synchronize_rcu() to be executed many times in a row
unnecessarily and introduces substantial delays during resume on some
systems.
Instead of using acpi_os_map_memory() for mapping the NVS pages in nvs.c
introduce acpi_os_ioremap() calling ioremap_cache() and make the code in
both osl.c and nvs.c use it.
Reported-by: Jeff Chua <jeff.chua.linux@gmail.com>
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
17 lines
377 B
C
17 lines
377 B
C
#ifndef _ACPI_IO_H_
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#define _ACPI_IO_H_
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#include <linux/io.h>
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#include <acpi/acpi.h>
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static inline void __iomem *acpi_os_ioremap(acpi_physical_address phys,
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acpi_size size)
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{
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return ioremap_cache(phys, size);
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}
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int acpi_os_map_generic_address(struct acpi_generic_address *addr);
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void acpi_os_unmap_generic_address(struct acpi_generic_address *addr);
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#endif
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