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x86: Select ARCH_MEMORY_ORDER_TSO

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The generic unsafe_atomic_store_release_user() implementation does:

    if (!IS_ENABLED(CONFIG_ARCH_MEMORY_ORDER_TSO))
        smp_mb();
    unsafe_put_user();

As x86 implements Total Store Order (TSO) which means stores imply release,
select ARCH_MEMORY_ORDER_TSO to avoid the unnecessary smp_mb().

Signed-off-by: Thomas Gleixner <tglx@kernel.org>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: André Almeida <andrealmeid@igalia.com>
Link: https://patch.msgid.link/20260602090535.564499644@kernel.org
This commit is contained in:
Thomas Gleixner 2026-06-02 11:09:47 +02:00 committed by Peter Zijlstra
parent 6149fc36c0
commit 7b125c44d0
1 changed files with 1 additions and 0 deletions
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arch/x86/Kconfig
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@ -113,6 +113,7 @@ config X86
select ARCH_HAS_ZONE_DMA_SET if EXPERT
select ARCH_HAVE_NMI_SAFE_CMPXCHG
select ARCH_HAVE_EXTRA_ELF_NOTES
select ARCH_MEMORY_ORDER_TSO
select ARCH_MHP_MEMMAP_ON_MEMORY_ENABLE
select ARCH_MIGHT_HAVE_ACPI_PDC if ACPI
select ARCH_MIGHT_HAVE_PC_PARPORT