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arm64/sve: Move sve_pffr() to fpsimd.h and make inline

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In order to make sve_save_state()/sve_load_state() more easily
reusable and to get rid of a potential branch on context switch
critical paths, this patch makes sve_pffr() inline and moves it to
fpsimd.h.

<asm/processor.h> must be included in fpsimd.h in order to make
this work, and this creates an #include cycle that is tricky to
avoid without modifying core code, due to the way the PR_SVE_*()
prctl helpers are included in the core prctl implementation.

Instead of breaking the cycle, this patch defers inclusion of
<asm/fpsimd.h> in <asm/processor.h> until the point where it is
actually needed: i.e., immediately before the prctl definitions.

No functional change.

Signed-off-by: Dave Martin <Dave.Martin@arm.com>
Reviewed-by: Alex Bennée <alex.bennee@linaro.org>
Acked-by: Catalin Marinas <catalin.marinas@arm.com>
Acked-by: Marc Zyngier <marc.zyngier@arm.com>
Signed-off-by: Marc Zyngier <marc.zyngier@arm.com>
This commit is contained in:
Dave Martin
2018-04-12 17:32:35 +01:00
committed by Marc Zyngier
parent 2cf97d46da
commit 9a6e594869
3 changed files with 24 additions and 13 deletions
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12
arch/arm64/kernel/fpsimd.c
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@@ -161,18 +161,6 @@ static void sve_free(struct task_struct *task)
__sve_free(task);
}
/* Offset of FFR in the SVE register dump */
static size_t sve_ffr_offset(int vl)
{
return SVE_SIG_FFR_OFFSET(sve_vq_from_vl(vl)) - SVE_SIG_REGS_OFFSET;
}
static void *sve_pffr(struct thread_struct *thread)
{
return (char *)thread->sve_state + sve_ffr_offset(thread->sve_vl);
}
static void change_cpacr(u64 val, u64 mask)
{
u64 cpacr = read_sysreg(CPACR_EL1);