From: "Matthew Wilcox (Oracle)" <willy@infradead.org>
To: Andrew Morton <akpm@linux-foundation.org>
Cc: "Matthew Wilcox (Oracle)" <willy@infradead.org>,
linux-mm@kvack.org, linux-fsdevel@vger.kernel.org,
linux-arch@vger.kernel.org, torvalds@linux-foundation.org,
npiggin@gmail.com
Subject: [PATCH v2 13/17] s390: Implement arch_xor_unlock_is_negative_byte
Date: Wed, 4 Oct 2023 17:53:13 +0100 [thread overview]
Message-ID: <20231004165317.1061855-14-willy@infradead.org> (raw)
In-Reply-To: <20231004165317.1061855-1-willy@infradead.org>
Inspired by the s390 arch_test_and_clear_bit(), this will surely be
more efficient than the generic one defined in filemap.c.
Signed-off-by: Matthew Wilcox (Oracle) <willy@infradead.org>
---
arch/s390/include/asm/bitops.h | 10 ++++++++++
1 file changed, 10 insertions(+)
diff --git a/arch/s390/include/asm/bitops.h b/arch/s390/include/asm/bitops.h
index 2de74fcd0578..c467dffa8c12 100644
--- a/arch/s390/include/asm/bitops.h
+++ b/arch/s390/include/asm/bitops.h
@@ -201,6 +201,16 @@ static inline void arch___clear_bit_unlock(unsigned long nr,
arch___clear_bit(nr, ptr);
}
+static inline bool arch_xor_unlock_is_negative_byte(unsigned long mask,
+ volatile unsigned long *ptr)
+{
+ unsigned long old;
+
+ old = __atomic64_xor_barrier(mask, (long *)ptr);
+ return old & BIT(7);
+}
+#define arch_xor_unlock_is_negative_byte arch_xor_unlock_is_negative_byte
+
#include <asm-generic/bitops/instrumented-atomic.h>
#include <asm-generic/bitops/instrumented-non-atomic.h>
#include <asm-generic/bitops/instrumented-lock.h>
--
2.40.1
next prev parent reply other threads:[~2023-10-04 16:53 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-04 16:53 [PATCH v2 00/17] Add folio_end_read Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 01/17] iomap: Hold state_lock over call to ifs_set_range_uptodate() Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 02/17] iomap: Protect read_bytes_pending with the state_lock Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 03/17] mm: Add folio_end_read() Matthew Wilcox (Oracle)
2024-02-23 15:26 ` Tetsuo Handa
2024-02-23 15:36 ` Matthew Wilcox
2023-10-04 16:53 ` [PATCH v2 04/17] ext4: Use folio_end_read() Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 05/17] buffer: " Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 06/17] iomap: " Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 07/17] bitops: Add xor_unlock_is_negative_byte() Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 08/17] alpha: Implement xor_unlock_is_negative_byte Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 09/17] m68k: " Matthew Wilcox (Oracle)
2023-10-04 23:49 ` Greg Ungerer
2023-10-05 8:11 ` Geert Uytterhoeven
2023-10-04 16:53 ` [PATCH v2 10/17] mips: " Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 11/17] powerpc: Implement arch_xor_unlock_is_negative_byte on 32-bit Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 12/17] riscv: Implement xor_unlock_is_negative_byte Matthew Wilcox (Oracle)
2023-10-04 16:53 ` Matthew Wilcox (Oracle) [this message]
2023-10-04 16:53 ` [PATCH v2 14/17] mm: Delete checks for xor_unlock_is_negative_byte() Matthew Wilcox (Oracle)
2023-10-05 8:12 ` Geert Uytterhoeven
2023-10-04 16:53 ` [PATCH v2 15/17] mm: Add folio_xor_flags_has_waiters() Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 16/17] mm: Make __end_folio_writeback() return void Matthew Wilcox (Oracle)
2023-10-04 16:53 ` [PATCH v2 17/17] mm: Use folio_xor_flags_has_waiters() in folio_end_writeback() Matthew Wilcox (Oracle)
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