linux-kernel - [PATCH RFC cmpxchg 7/8] parisc: Emulate two-byte cmpxchg

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Date: Mon,  1 Apr 2024 14:39:49 -0700
From: "Paul E. McKenney" <paulmck@...nel.org>
To: linux-kernel@...r.kernel.org
Cc: kernel-team@...a.com,
	"Paul E. McKenney" <paulmck@...nel.org>,
	"James E.J. Bottomley" <James.Bottomley@...senPartnership.com>,
	Helge Deller <deller@....de>,
	Palmer Dabbelt <palmer@...osinc.com>,
	Geert Uytterhoeven <geert@...ux-m68k.org>,
	Arnd Bergmann <arnd@...db.de>,
	"Peter Zijlstra (Intel)" <peterz@...radead.org>,
	Andrzej Hajda <andrzej.hajda@...el.com>,
	linux-parisc@...r.kernel.org
Subject: [PATCH RFC cmpxchg 7/8] parisc: Emulate two-byte cmpxchg

Use the new cmpxchg_emu_u16() to emulate two-byte cmpxchg() on parisc.

Signed-off-by: Paul E. McKenney <paulmck@...nel.org>
Cc: "James E.J. Bottomley" <James.Bottomley@...senPartnership.com>
Cc: Helge Deller <deller@....de>
Cc: Palmer Dabbelt <palmer@...osinc.com>
Cc: Geert Uytterhoeven <geert@...ux-m68k.org>
Cc: Arnd Bergmann <arnd@...db.de>
Cc: "Peter Zijlstra (Intel)" <peterz@...radead.org>
Cc: Andrzej Hajda <andrzej.hajda@...el.com>
Cc: <linux-parisc@...r.kernel.org>
---
 arch/parisc/Kconfig               | 1 +
 arch/parisc/include/asm/cmpxchg.h | 1 +
 2 files changed, 2 insertions(+)

diff --git a/arch/parisc/Kconfig b/arch/parisc/Kconfig
index daafeb20f9937..06f221a3f3459 100644
--- a/arch/parisc/Kconfig
+++ b/arch/parisc/Kconfig
@@ -15,6 +15,7 @@ config PARISC
 	select ARCH_HAS_STRICT_MODULE_RWX
 	select ARCH_HAS_UBSAN
 	select ARCH_HAS_PTE_SPECIAL
+	select ARCH_NEED_CMPXCHG_1_2_EMU
 	select ARCH_NO_SG_CHAIN
 	select ARCH_SUPPORTS_HUGETLBFS if PA20
 	select ARCH_SUPPORTS_MEMORY_FAILURE
diff --git a/arch/parisc/include/asm/cmpxchg.h b/arch/parisc/include/asm/cmpxchg.h
index c1d776bb16b4e..f909c000b6577 100644
--- a/arch/parisc/include/asm/cmpxchg.h
+++ b/arch/parisc/include/asm/cmpxchg.h
@@ -72,6 +72,7 @@ __cmpxchg(volatile void *ptr, unsigned long old, unsigned long new_, int size)
 #endif
 	case 4: return __cmpxchg_u32((unsigned int *)ptr,
 				     (unsigned int)old, (unsigned int)new_);
+	case 2: return cmpxchg_emu_u16((volatile u16 *)ptr, old, new);
 	case 1: return __cmpxchg_u8((u8 *)ptr, old & 0xff, new_ & 0xff);
 	}
 	__cmpxchg_called_with_bad_pointer();
-- 
2.40.1