Re: [PATCH] sched/fair: fix boolreturn.cocci warning

[Joe Perches]

On Tue, 2021-12-14 at 10:52 -0500, Steven Rostedt wrote:
> On Tue, 14 Dec 2021 07:24:34 -0800
> Joe Perches <joe@xxxxxxxxxxx> wrote:
> 
> > Perhaps it is more a change for consistency than a fix for correctness.
> > 
> > $ git grep -P 'return\s+(?:true|false)' kernel/sched/ | wc -l
> > 209
> 
> As with those other changes, it should be fixed when the function is
> updated. No need to add the churn now.

<shrug> that's the only bool 1/0 return in the subsystem.

Overall there are very few uses of this pattern in the kernel.

There are about 35000 uses of return true/false
and fewer than 50 uses of return 1/0

$ git grep  -P '\breturn\s+(?:true|false)\s*;' -- '*.[ch]' | wc -l
34828

$ cat bool.cocci
@@
typedef bool;
identifier fn;
@@

 bool fn(...)
 {
	<...
*	return \(1\|0\);
	...>
 }

@@
typedef bool;
identifier fn;
expression e;
@@

 bool fn(...)
 {
	<...
*	return e ? 1 : 0;
	...>
 }

$ spatch -sp-file bool.cocci . | grep -P '^(diff|\@|\-[^\-])'
diff -u -p ./arch/arm/mach-omap2/cm2xxx.c /tmp/nothing/arch/arm/mach-omap2/cm2xxx.c
@@ -58,7 +58,6 @@ static bool omap2xxx_cm_is_clkdm_in_hwsu
-	return (v == OMAP24XX_CLKSTCTRL_ENABLE_AUTO) ? 1 : 0;
diff -u -p ./arch/arm/mach-omap2/cm3xxx.c /tmp/nothing/arch/arm/mach-omap2/cm3xxx.c
@@ -47,7 +47,6 @@ static bool omap3xxx_cm_is_clkdm_in_hwsu
-	return (v == OMAP34XX_CLKSTCTRL_ENABLE_AUTO) ? 1 : 0;
diff -u -p ./arch/arm/mach-omap2/powerdomain.c /tmp/nothing/arch/arm/mach-omap2/powerdomain.c
@@ -968,7 +968,6 @@ int pwrdm_disable_hdwr_sar(struct powerd
-	return (pwrdm && pwrdm->flags & PWRDM_HAS_HDWR_SAR) ? 1 : 0;
diff -u -p ./arch/arm/mach-omap2/prm44xx.c /tmp/nothing/arch/arm/mach-omap2/prm44xx.c
@@ -403,7 +403,6 @@ static u32 omap44xx_prm_read_reset_sourc
-	return (omap4_prminst_read_inst_reg(part, inst, idx)) ? 1 : 0;
diff -u -p ./arch/arm/mm/nommu.c /tmp/nothing/arch/arm/mm/nommu.c
@@ -56,7 +56,6 @@ static inline bool security_extensions_e
-	return 0;
diff -u -p ./arch/x86/boot/compressed/kaslr.c /tmp/nothing/arch/x86/boot/compressed/kaslr.c
@@ -668,7 +668,6 @@ static bool process_mem_region(struct me
-	return 0;
diff -u -p ./arch/x86/events/intel/lbr.c /tmp/nothing/arch/x86/events/intel/lbr.c
@@ -914,7 +914,6 @@ static __always_inline int get_lbr_br_ty
-		return 0;
@@ -922,7 +921,6 @@ static __always_inline bool get_lbr_misp
-		return 0;
diff -u -p ./arch/x86/kvm/mmu/mmu.c /tmp/nothing/arch/x86/kvm/mmu/mmu.c
@@ -1482,7 +1482,6 @@ restart:
-		return 0;
@@ -1623,8 +1622,6 @@ static bool kvm_test_age_rmapp(struct kv
-			return 1;
-	return 0;
diff -u -p ./drivers/char/tpm/tpm_ftpm_tee.c /tmp/nothing/drivers/char/tpm/tpm_ftpm_tee.c
@@ -177,7 +177,6 @@ static u8 ftpm_tee_tpm_op_status(struct
-	return 0;
diff -u -p ./drivers/clk/at91/clk-pll.c /tmp/nothing/drivers/clk/at91/clk-pll.c
@@ -49,7 +49,6 @@ static inline bool clk_pll_ready(struct
-	return status & PLL_STATUS_MASK(id) ? 1 : 0;
diff -u -p ./drivers/irqchip/irq-csky-apb-intc.c /tmp/nothing/drivers/irqchip/irq-csky-apb-intc.c
@@ -136,11 +136,9 @@ static inline bool handle_irq_perbit(str
-		return 0;
-	return 1;
diff -u -p ./drivers/mtd/nand/core.c /tmp/nothing/drivers/mtd/nand/core.c
@@ -22,7 +22,6 @@
-		return 0;
diff -u -p ./drivers/net/ethernet/marvell/octeontx2/af/rvu.c /tmp/nothing/drivers/net/ethernet/marvell/octeontx2/af/rvu.c
@@ -1240,9 +1240,7 @@ static bool is_blktype_attached(struct r
-		return pfvf->npalf ? 1 : 0;
-		return pfvf->nixlf ? 1 : 0;
diff -u -p ./drivers/net/wireless/ath/ath5k/dma.c /tmp/nothing/drivers/net/wireless/ath/ath5k/dma.c
@@ -505,7 +505,6 @@ done:
-	return ath5k_hw_reg_read(ah, AR5K_INTPEND) == 1 ? 1 : 0;
diff -u -p ./drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c /tmp/nothing/drivers/net/wireless/mediatek/mt76/mt7921/sdio_mac.c
@@ -219,5 +219,4 @@ bool mt7921s_tx_status_data(struct mt76_
-	return 0;
diff -u -p ./drivers/pci/controller/pcie-xilinx.c /tmp/nothing/drivers/pci/controller/pcie-xilinx.c
@@ -122,8 +122,6 @@ static inline void pcie_write(struct xil
-	return (pcie_read(port, XILINX_PCIE_REG_PSCR) &
-		XILINX_PCIE_REG_PSCR_LNKUP) ? 1 : 0;
diff -u -p ./drivers/scsi/elx/libefc_sli/sli4.c /tmp/nothing/drivers/scsi/elx/libefc_sli/sli4.c
@@ -4036,7 +4036,6 @@ sli_fw_ready(struct sli4 *sli4)
-	return (val & SLI4_PORT_STATUS_RDY) ? 1 : 0;
diff -u -p ./fs/nfsd/nfs2acl.c /tmp/nothing/fs/nfsd/nfs2acl.c
@@ -249,34 +249,26 @@ nfsaclsvc_encode_getaclres(struct svc_rq
-		return 0;
-		return 1;
-		return 0;
-		return 0;
-			return 1;
-		return 0;
-		return 0;
-	return 1;
@@ -286,17 +278,13 @@ nfsaclsvc_encode_accessres(struct svc_rq
-		return 0;
-			return 0;
-			return 0;
-	return 1;
diff -u -p ./kernel/locking/rtmutex.c /tmp/nothing/kernel/locking/rtmutex.c
@@ -372,24 +372,19 @@ static __always_inline bool __waiter_les
-		return 1;
-		return 0;
-		return 0;
-			return 1;
-	return 0;
diff -u -p ./kernel/locking/rwbase_rt.c /tmp/nothing/kernel/locking/rwbase_rt.c
@@ -223,10 +223,8 @@ static inline bool __rwbase_write_tryloc
-		return 1;
-	return 0;
diff -u -p ./kernel/sched/fair.c /tmp/nothing/kernel/sched/fair.c
@@ -9777,9 +9777,7 @@ imbalanced_active_balance(struct lb_env
-		return 1;
-	return 0;