[PATCH 05/18] arm64: kill change_cpacr()

From: Mark Rutland
Date: Mon May 14 2018 - 05:52:04 EST


Now that we have sysreg_clear_set(), we can use this instead of
change_cpacr().

Note that the order of the set and clear arguments differs between
change_cpacr() and sysreg_clear_set(), so these are flipped as part of
the conversion. Also, sve_user_enable() redundantly clears
CPACR_EL1_ZEN_EL0EN before setting it; this is removed for clarity.

Signed-off-by: Mark Rutland <mark.rutland@xxxxxxx>
Cc: Catalin Marinas <catalin.marinas@xxxxxxx>
Cc: Dave Martin <dave.martin@xxxxxxx>
Cc: James Morse <james.morse@xxxxxxx>
Cc: Will Deacon <will.deacon@xxxxxxx>
---
arch/arm64/kernel/fpsimd.c | 13 ++-----------
1 file changed, 2 insertions(+), 11 deletions(-)

diff --git a/arch/arm64/kernel/fpsimd.c b/arch/arm64/kernel/fpsimd.c
index 87a35364e750..088940387a4d 100644
--- a/arch/arm64/kernel/fpsimd.c
+++ b/arch/arm64/kernel/fpsimd.c
@@ -172,23 +172,14 @@ static void *sve_pffr(struct task_struct *task)
sve_ffr_offset(task->thread.sve_vl);
}

-static void change_cpacr(u64 val, u64 mask)
-{
- u64 cpacr = read_sysreg(CPACR_EL1);
- u64 new = (cpacr & ~mask) | val;
-
- if (new != cpacr)
- write_sysreg(new, CPACR_EL1);
-}
-
static void sve_user_disable(void)
{
- change_cpacr(0, CPACR_EL1_ZEN_EL0EN);
+ sysreg_clear_set(cpacr_el1, CPACR_EL1_ZEN_EL0EN, 0);
}

static void sve_user_enable(void)
{
- change_cpacr(CPACR_EL1_ZEN_EL0EN, CPACR_EL1_ZEN_EL0EN);
+ sysreg_clear_set(cpacr_el1, 0, CPACR_EL1_ZEN_EL0EN);
}

/*
--
2.11.0