mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-11-30 06:46:41 +07:00
3018965139
The operations on the bitmap pointers are protected by "memory"
clobbering raw_local_irq_{save,restore}(), so there is no need for
volatile here. By removing the volatile we get better code generation
out of the compiler.
Signed-off-by: David Daney <david.daney@cavium.com>
Patchwork: http://patchwork.linux-mips.org/patch/4966/
Acked-by: John Crispin <blogic@openwrt.org>
180 lines
4.4 KiB
C
180 lines
4.4 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* Copyright (c) 1994-1997, 99, 2000, 06, 07 Ralf Baechle (ralf@linux-mips.org)
|
|
* Copyright (c) 1999, 2000 Silicon Graphics, Inc.
|
|
*/
|
|
#include <linux/bitops.h>
|
|
#include <linux/irqflags.h>
|
|
#include <linux/export.h>
|
|
|
|
|
|
/**
|
|
* __mips_set_bit - Atomically set a bit in memory. This is called by
|
|
* set_bit() if it cannot find a faster solution.
|
|
* @nr: the bit to set
|
|
* @addr: the address to start counting from
|
|
*/
|
|
void __mips_set_bit(unsigned long nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long *a = (unsigned long *)addr;
|
|
unsigned bit = nr & SZLONG_MASK;
|
|
unsigned long mask;
|
|
unsigned long flags;
|
|
|
|
a += nr >> SZLONG_LOG;
|
|
mask = 1UL << bit;
|
|
raw_local_irq_save(flags);
|
|
*a |= mask;
|
|
raw_local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(__mips_set_bit);
|
|
|
|
|
|
/**
|
|
* __mips_clear_bit - Clears a bit in memory. This is called by clear_bit() if
|
|
* it cannot find a faster solution.
|
|
* @nr: Bit to clear
|
|
* @addr: Address to start counting from
|
|
*/
|
|
void __mips_clear_bit(unsigned long nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long *a = (unsigned long *)addr;
|
|
unsigned bit = nr & SZLONG_MASK;
|
|
unsigned long mask;
|
|
unsigned long flags;
|
|
|
|
a += nr >> SZLONG_LOG;
|
|
mask = 1UL << bit;
|
|
raw_local_irq_save(flags);
|
|
*a &= ~mask;
|
|
raw_local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(__mips_clear_bit);
|
|
|
|
|
|
/**
|
|
* __mips_change_bit - Toggle a bit in memory. This is called by change_bit()
|
|
* if it cannot find a faster solution.
|
|
* @nr: Bit to change
|
|
* @addr: Address to start counting from
|
|
*/
|
|
void __mips_change_bit(unsigned long nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long *a = (unsigned long *)addr;
|
|
unsigned bit = nr & SZLONG_MASK;
|
|
unsigned long mask;
|
|
unsigned long flags;
|
|
|
|
a += nr >> SZLONG_LOG;
|
|
mask = 1UL << bit;
|
|
raw_local_irq_save(flags);
|
|
*a ^= mask;
|
|
raw_local_irq_restore(flags);
|
|
}
|
|
EXPORT_SYMBOL(__mips_change_bit);
|
|
|
|
|
|
/**
|
|
* __mips_test_and_set_bit - Set a bit and return its old value. This is
|
|
* called by test_and_set_bit() if it cannot find a faster solution.
|
|
* @nr: Bit to set
|
|
* @addr: Address to count from
|
|
*/
|
|
int __mips_test_and_set_bit(unsigned long nr,
|
|
volatile unsigned long *addr)
|
|
{
|
|
unsigned long *a = (unsigned long *)addr;
|
|
unsigned bit = nr & SZLONG_MASK;
|
|
unsigned long mask;
|
|
unsigned long flags;
|
|
int res;
|
|
|
|
a += nr >> SZLONG_LOG;
|
|
mask = 1UL << bit;
|
|
raw_local_irq_save(flags);
|
|
res = (mask & *a) != 0;
|
|
*a |= mask;
|
|
raw_local_irq_restore(flags);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(__mips_test_and_set_bit);
|
|
|
|
|
|
/**
|
|
* __mips_test_and_set_bit_lock - Set a bit and return its old value. This is
|
|
* called by test_and_set_bit_lock() if it cannot find a faster solution.
|
|
* @nr: Bit to set
|
|
* @addr: Address to count from
|
|
*/
|
|
int __mips_test_and_set_bit_lock(unsigned long nr,
|
|
volatile unsigned long *addr)
|
|
{
|
|
unsigned long *a = (unsigned long *)addr;
|
|
unsigned bit = nr & SZLONG_MASK;
|
|
unsigned long mask;
|
|
unsigned long flags;
|
|
int res;
|
|
|
|
a += nr >> SZLONG_LOG;
|
|
mask = 1UL << bit;
|
|
raw_local_irq_save(flags);
|
|
res = (mask & *a) != 0;
|
|
*a |= mask;
|
|
raw_local_irq_restore(flags);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(__mips_test_and_set_bit_lock);
|
|
|
|
|
|
/**
|
|
* __mips_test_and_clear_bit - Clear a bit and return its old value. This is
|
|
* called by test_and_clear_bit() if it cannot find a faster solution.
|
|
* @nr: Bit to clear
|
|
* @addr: Address to count from
|
|
*/
|
|
int __mips_test_and_clear_bit(unsigned long nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long *a = (unsigned long *)addr;
|
|
unsigned bit = nr & SZLONG_MASK;
|
|
unsigned long mask;
|
|
unsigned long flags;
|
|
int res;
|
|
|
|
a += nr >> SZLONG_LOG;
|
|
mask = 1UL << bit;
|
|
raw_local_irq_save(flags);
|
|
res = (mask & *a) != 0;
|
|
*a &= ~mask;
|
|
raw_local_irq_restore(flags);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(__mips_test_and_clear_bit);
|
|
|
|
|
|
/**
|
|
* __mips_test_and_change_bit - Change a bit and return its old value. This is
|
|
* called by test_and_change_bit() if it cannot find a faster solution.
|
|
* @nr: Bit to change
|
|
* @addr: Address to count from
|
|
*/
|
|
int __mips_test_and_change_bit(unsigned long nr, volatile unsigned long *addr)
|
|
{
|
|
unsigned long *a = (unsigned long *)addr;
|
|
unsigned bit = nr & SZLONG_MASK;
|
|
unsigned long mask;
|
|
unsigned long flags;
|
|
int res;
|
|
|
|
a += nr >> SZLONG_LOG;
|
|
mask = 1UL << bit;
|
|
raw_local_irq_save(flags);
|
|
res = (mask & *a) != 0;
|
|
*a ^= mask;
|
|
raw_local_irq_restore(flags);
|
|
return res;
|
|
}
|
|
EXPORT_SYMBOL(__mips_test_and_change_bit);
|