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powerpc: implement arch_xor_unlock_is_negative_byte on 32-bit

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Simply remove the ifdef.  The assembly is identical to that in the
non-optimised case of test_and_clear_bits() on PPC32, and it's not clear
to me how the PPC32 optimisation works, nor whether it would work for
arch_xor_unlock_is_negative_byte().  If that optimisation would work,
someone can implement it later, but this is more efficient than the
implementation in filemap.c.

Link: https://lkml.kernel.org/r/20231004165317.1061855-12-willy@infradead.org
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.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: Geert Uytterhoeven <geert@linux-m68k.org>
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 17:53:11 +01:00 committed by Andrew Morton
parent 8da36b26e3
commit 51a752c28b
1 changed files with 0 additions and 4 deletions
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4
arch/powerpc/include/asm/bitops.h
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@ -233,7 +233,6 @@ static inline int arch_test_and_change_bit(unsigned long nr,
return test_and_change_bits(BIT_MASK(nr), addr + BIT_WORD(nr)) != 0;
}
#ifdef CONFIG_PPC64
static inline bool arch_xor_unlock_is_negative_byte(unsigned long mask,
volatile unsigned long *p)
{
@ -251,11 +250,8 @@ static inline bool arch_xor_unlock_is_negative_byte(unsigned long mask,
return (old & BIT_MASK(7)) != 0;
}
#define arch_xor_unlock_is_negative_byte arch_xor_unlock_is_negative_byte
#endif /* CONFIG_PPC64 */
#include <asm-generic/bitops/non-atomic.h>
static inline void arch___clear_bit_unlock(int nr, volatile unsigned long *addr)