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mm: delete checks for xor_unlock_is_negative_byte() 

Architectures which don't define their own use the one in
asm-generic/bitops/lock.h.  Get rid of all the ifdefs around "maybe we
don't have it".

Link: https://lkml.kernel.org/r/20231004165317.1061855-15-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: Alexander Gordeev <agordeev@linux.ibm.com>
Cc: Andreas Dilger <adilger.kernel@dilger.ca>
Cc: Christian Borntraeger <borntraeger@linux.ibm.com>
Cc: Christophe Leroy <christophe.leroy@csgroup.eu>
Cc: Heiko Carstens <hca@linux.ibm.com>
Cc: Ivan Kokshaysky <ink@jurassic.park.msu.ru>
Cc: Matt Turner <mattst88@gmail.com>
Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Nicholas Piggin <npiggin@gmail.com>
Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Paul Walmsley <paul.walmsley@sifive.com>
Cc: Richard Henderson <richard.henderson@linaro.org>
Cc: Sven Schnelle <svens@linux.ibm.com>
Cc: "Theodore Ts'o" <tytso@mit.edu>
Cc: Thomas Bogendoerfer <tsbogend@alpha.franken.de>
Cc: Vasily Gorbik <gor@linux.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
This commit is contained in:
Matthew Wilcox (Oracle) 2023-10-04 17:53:14 +01:00 committed by Andrew Morton
parent 12010aa89f
commit f12fb73b74
10 changed files with 1 additions and 48 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/alpha/include/asm/bitops.h
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@ -305,7 +305,6 @@ static inline bool xor_unlock_is_negative_byte(unsigned long mask,
return (old & BIT(7)) != 0;
}
#define xor_unlock_is_negative_byte xor_unlock_is_negative_byte
/*
* ffz = Find First Zero in word. Undefined if no zero exists,

1
arch/m68k/include/asm/bitops.h
View File

@ -339,7 +339,6 @@ static inline bool xor_unlock_is_negative_byte(unsigned long mask,
return result;
#endif
}
#define xor_unlock_is_negative_byte xor_unlock_is_negative_byte
/*
* The true 68020 and more advanced processors support the "bfffo"

1
arch/mips/include/asm/bitops.h
View File

@ -301,7 +301,6 @@ static inline bool xor_unlock_is_negative_byte(unsigned long mask,
return res;
}
#define xor_unlock_is_negative_byte xor_unlock_is_negative_byte
#undef __bit_op
#undef __test_bit_op

1
arch/riscv/include/asm/bitops.h
View File

@ -202,7 +202,6 @@ static inline bool xor_unlock_is_negative_byte(unsigned long mask,
: "memory");
return (res & BIT(7)) != 0;
}
#define xor_unlock_is_negative_byte xor_unlock_is_negative_byte
#undef __test_and_op_bit
#undef __op_bit

5
include/asm-generic/bitops/instrumented-lock.h
View File

@ -58,7 +58,6 @@ static inline bool test_and_set_bit_lock(long nr, volatile unsigned long *addr)
return arch_test_and_set_bit_lock(nr, addr);
}
#if defined(arch_xor_unlock_is_negative_byte)
/**
* xor_unlock_is_negative_byte - XOR a single byte in memory and test if
* it is negative, for unlock.
@ -80,8 +79,4 @@ static inline bool xor_unlock_is_negative_byte(unsigned long mask,
instrument_atomic_write(addr, sizeof(long));
return arch_xor_unlock_is_negative_byte(mask, addr);
}
/* Let everybody know we have it. */
#define xor_unlock_is_negative_byte xor_unlock_is_negative_byte
#endif
#endif /* _ASM_GENERIC_BITOPS_INSTRUMENTED_LOCK_H */

1
include/asm-generic/bitops/lock.h
View File

@ -75,7 +75,6 @@ static inline bool arch_xor_unlock_is_negative_byte(unsigned long mask,
old = raw_atomic_long_fetch_xor_release(mask, (atomic_long_t *)p);
return !!(old & BIT(7));
}
#define arch_xor_unlock_is_negative_byte arch_xor_unlock_is_negative_byte
#endif
#include <asm-generic/bitops/instrumented-lock.h>

3
kernel/kcsan/kcsan_test.c
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@ -699,12 +699,9 @@ static void test_barrier_nothreads(struct kunit *test)
KCSAN_EXPECT_RW_BARRIER(spin_unlock(&test_spinlock), true);
KCSAN_EXPECT_RW_BARRIER(mutex_lock(&test_mutex), false);
KCSAN_EXPECT_RW_BARRIER(mutex_unlock(&test_mutex), true);
#ifdef xor_unlock_is_negative_byte
KCSAN_EXPECT_READ_BARRIER(xor_unlock_is_negative_byte(1, &test_var), true);
KCSAN_EXPECT_WRITE_BARRIER(xor_unlock_is_negative_byte(1, &test_var), true);
KCSAN_EXPECT_RW_BARRIER(xor_unlock_is_negative_byte(1, &test_var), true);
#endif
kcsan_nestable_atomic_end();
}

3
kernel/kcsan/selftest.c
View File

@ -227,12 +227,9 @@ static bool __init test_barrier(void)
KCSAN_CHECK_RW_BARRIER(arch_spin_unlock(&arch_spinlock));
spin_lock(&test_spinlock);
KCSAN_CHECK_RW_BARRIER(spin_unlock(&test_spinlock));
#ifdef xor_unlock_is_negative_byte
KCSAN_CHECK_RW_BARRIER(xor_unlock_is_negative_byte(1, &test_var));
KCSAN_CHECK_READ_BARRIER(xor_unlock_is_negative_byte(1, &test_var));
KCSAN_CHECK_WRITE_BARRIER(xor_unlock_is_negative_byte(1, &test_var));
#endif
kcsan_nestable_atomic_end();
return ret;

30
mm/filemap.c
View File

@ -1482,34 +1482,6 @@ void folio_add_wait_queue(struct folio *folio, wait_queue_entry_t *waiter)
}
EXPORT_SYMBOL_GPL(folio_add_wait_queue);
#ifdef xor_unlock_is_negative_byte
#define clear_bit_unlock_is_negative_byte(nr, p) \
xor_unlock_is_negative_byte(1 << nr, p)
#endif
#ifndef clear_bit_unlock_is_negative_byte
/*
* PG_waiters is the high bit in the same byte as PG_lock.
*
* On x86 (and on many other architectures), we can clear PG_lock and
* test the sign bit at the same time. But if the architecture does
* not support that special operation, we just do this all by hand
* instead.
*
* The read of PG_waiters has to be after (or concurrently with) PG_locked
* being cleared, but a memory barrier should be unnecessary since it is
* in the same byte as PG_locked.
*/
static inline bool clear_bit_unlock_is_negative_byte(long nr, volatile void *mem)
{
clear_bit_unlock(nr, mem);
/* smp_mb__after_atomic(); */
return test_bit(PG_waiters, mem);
}
#endif
/**
* folio_unlock - Unlock a locked folio.
* @folio: The folio.
@ -1525,7 +1497,7 @@ void folio_unlock(struct folio *folio)
BUILD_BUG_ON(PG_waiters != 7);
BUILD_BUG_ON(PG_locked > 7);
VM_BUG_ON_FOLIO(!folio_test_locked(folio), folio);
if (clear_bit_unlock_is_negative_byte(PG_locked, folio_flags(folio, 0)))
if (xor_unlock_is_negative_byte(1 << PG_locked, folio_flags(folio, 0)))
folio_wake_bit(folio, PG_locked);
}
EXPORT_SYMBOL(folio_unlock);

3
mm/kasan/kasan_test.c
View File

@ -1098,12 +1098,9 @@ static void kasan_bitops_test_and_modify(struct kunit *test, int nr, void *addr)
KUNIT_EXPECT_KASAN_FAIL(test, test_and_change_bit(nr, addr));
KUNIT_EXPECT_KASAN_FAIL(test, __test_and_change_bit(nr, addr));
KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result = test_bit(nr, addr));
#if defined(xor_unlock_is_negative_byte)
if (nr < 7)
KUNIT_EXPECT_KASAN_FAIL(test, kasan_int_result =
xor_unlock_is_negative_byte(1 << nr, addr));
#endif
}
static void kasan_bitops_generic(struct kunit *test)