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Date: Fri, 10 Jan 2020 12:59:59 +0100
From: Vitaly Kuznetsov <vkuznets@...hat.com>
To: Chen Zhou <chenzhou10@...wei.com>
Cc: linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org,
chenzhou10@...wei.com, tglx@...utronix.de, mingo@...hat.com
Subject: Re: [PATCH] x86/hyper-v: remove unnecessary conversions to bool
Chen Zhou <chenzhou10@...wei.com> writes:
> The conversions to bool are not needed, remove these.
>
> Signed-off-by: Chen Zhou <chenzhou10@...wei.com>
> ---
> arch/x86/hyperv/hv_apic.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c
> index 40e0e32..3112cf6 100644
> --- a/arch/x86/hyperv/hv_apic.c
> +++ b/arch/x86/hyperv/hv_apic.c
> @@ -133,7 +133,7 @@ static bool __send_ipi_mask_ex(const struct cpumask *mask, int vector)
>
> ipi_mask_ex_done:
> local_irq_restore(flags);
> - return ((ret == 0) ? true : false);
> + return ret == 0;
> }
>
> static bool __send_ipi_mask(const struct cpumask *mask, int vector)
> @@ -186,7 +186,7 @@ static bool __send_ipi_mask(const struct cpumask *mask, int vector)
>
> ret = hv_do_fast_hypercall16(HVCALL_SEND_IPI, ipi_arg.vector,
> ipi_arg.cpu_mask);
> - return ((ret == 0) ? true : false);
> + return ret == 0;
>
> do_ex_hypercall:
> return __send_ipi_mask_ex(mask, vector);
I'd suggest we get rid of bool functions completely instead, something
like (untested):
diff --git a/arch/x86/hyperv/hv_apic.c b/arch/x86/hyperv/hv_apic.c
index 40e0e322161d..440bda338763 100644
--- a/arch/x86/hyperv/hv_apic.c
+++ b/arch/x86/hyperv/hv_apic.c
@@ -97,16 +97,16 @@ static void hv_apic_eoi_write(u32 reg, u32 val)
/*
* IPI implementation on Hyper-V.
*/
-static bool __send_ipi_mask_ex(const struct cpumask *mask, int vector)
+static u16 __send_ipi_mask_ex(const struct cpumask *mask, int vector)
{
struct hv_send_ipi_ex **arg;
struct hv_send_ipi_ex *ipi_arg;
unsigned long flags;
int nr_bank = 0;
- int ret = 1;
+ u16 ret;
if (!(ms_hyperv.hints & HV_X64_EX_PROCESSOR_MASKS_RECOMMENDED))
- return false;
+ return U16_MAX;
local_irq_save(flags);
arg = (struct hv_send_ipi_ex **)this_cpu_ptr(hyperv_pcpu_input_arg);
@@ -129,29 +129,28 @@ static bool __send_ipi_mask_ex(const struct cpumask *mask, int vector)
ipi_arg->vp_set.format = HV_GENERIC_SET_ALL;
ret = hv_do_rep_hypercall(HVCALL_SEND_IPI_EX, 0, nr_bank,
- ipi_arg, NULL);
+ ipi_arg, NULL);
ipi_mask_ex_done:
local_irq_restore(flags);
- return ((ret == 0) ? true : false);
+ return ret;
}
-static bool __send_ipi_mask(const struct cpumask *mask, int vector)
+static u16 __send_ipi_mask(const struct cpumask *mask, int vector)
{
int cur_cpu, vcpu;
struct hv_send_ipi ipi_arg;
- int ret = 1;
trace_hyperv_send_ipi_mask(mask, vector);
if (cpumask_empty(mask))
- return true;
+ return 0;
if (!hv_hypercall_pg)
- return false;
+ return U16_MAX;
if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR))
- return false;
+ return U16_MAX;
/*
* From the supplied CPU set we need to figure out if we can get away
@@ -172,7 +171,7 @@ static bool __send_ipi_mask(const struct cpumask *mask, int vector)
for_each_cpu(cur_cpu, mask) {
vcpu = hv_cpu_number_to_vp_number(cur_cpu);
if (vcpu == VP_INVAL)
- return false;
+ return U16_MAX;
/*
* This particular version of the IPI hypercall can
@@ -184,41 +183,40 @@ static bool __send_ipi_mask(const struct cpumask *mask, int vector)
__set_bit(vcpu, (unsigned long *)&ipi_arg.cpu_mask);
}
- ret = hv_do_fast_hypercall16(HVCALL_SEND_IPI, ipi_arg.vector,
- ipi_arg.cpu_mask);
- return ((ret == 0) ? true : false);
+ return (u16)hv_do_fast_hypercall16(HVCALL_SEND_IPI, ipi_arg.vector,
+ ipi_arg.cpu_mask);
do_ex_hypercall:
return __send_ipi_mask_ex(mask, vector);
}
-static bool __send_ipi_one(int cpu, int vector)
+static u16 __send_ipi_one(int cpu, int vector)
{
int vp = hv_cpu_number_to_vp_number(cpu);
trace_hyperv_send_ipi_one(cpu, vector);
if (!hv_hypercall_pg || (vp == VP_INVAL))
- return false;
+ return U16_MAX;
if ((vector < HV_IPI_LOW_VECTOR) || (vector > HV_IPI_HIGH_VECTOR))
- return false;
+ return U16_MAX;
if (vp >= 64)
return __send_ipi_mask_ex(cpumask_of(cpu), vector);
- return !hv_do_fast_hypercall16(HVCALL_SEND_IPI, vector, BIT_ULL(vp));
+ return (u16)hv_do_fast_hypercall16(HVCALL_SEND_IPI, vector, BIT_ULL(vp));
}
static void hv_send_ipi(int cpu, int vector)
{
- if (!__send_ipi_one(cpu, vector))
+ if (__send_ipi_one(cpu, vector))
orig_apic.send_IPI(cpu, vector);
}
static void hv_send_ipi_mask(const struct cpumask *mask, int vector)
{
- if (!__send_ipi_mask(mask, vector))
+ if (__send_ipi_mask(mask, vector))
orig_apic.send_IPI_mask(mask, vector);
}
@@ -231,7 +229,7 @@ static void hv_send_ipi_mask_allbutself(const struct cpumask *mask, int vector)
cpumask_copy(&new_mask, mask);
cpumask_clear_cpu(this_cpu, &new_mask);
local_mask = &new_mask;
- if (!__send_ipi_mask(local_mask, vector))
+ if (__send_ipi_mask(local_mask, vector))
orig_apic.send_IPI_mask_allbutself(mask, vector);
}
@@ -242,13 +240,13 @@ static void hv_send_ipi_allbutself(int vector)
static void hv_send_ipi_all(int vector)
{
- if (!__send_ipi_mask(cpu_online_mask, vector))
+ if (__send_ipi_mask(cpu_online_mask, vector))
orig_apic.send_IPI_all(vector);
}
static void hv_send_ipi_self(int vector)
{
- if (!__send_ipi_one(smp_processor_id(), vector))
+ if (__send_ipi_one(smp_processor_id(), vector))
orig_apic.send_IPI_self(vector);
}
--
Vitaly
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