[PATCH] x86/resctrl: Cleanup cbm_ensure_valid()

[PATCH] x86/resctrl: Cleanup cbm_ensure_valid()

[Reinette Chatre]

A recent fix to the cbm_ensure_valid() function left
some coding style issues that are now addressed:
- Follow reverse fir tree ordering of variable declarations
- Use if (!val) instead of if (val == 0)
- Return a value instead of using a function parameter as input and
output

Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index b63e50b1a096..e63cef0a09cc 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2496,21 +2496,21 @@ static int mkdir_mondata_all(struct kernfs_node *parent_kn,
  * modification to the CBM if the default does not satisfy the
  * requirements.
  */
-static void cbm_ensure_valid(u32 *_val, struct rdt_resource *r)
+static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
 {
-	unsigned long val = *_val;
 	unsigned int cbm_len = r->cache.cbm_len;
 	unsigned long first_bit, zero_bit;
+	unsigned long val = _val;
 
-	if (val == 0)
-		return;
+	if (!val)
+		return 0;
 
 	first_bit = find_first_bit(&val, cbm_len);
 	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
 
 	/* Clear any remaining bits to ensure contiguous region */
 	bitmap_clear(&val, zero_bit, cbm_len - zero_bit);
-	*_val = (u32)val;
+	return (u32)val;
 }
 
 /*
@@ -2563,7 +2563,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
 	 * Force the initial CBM to be valid, user can
 	 * modify the CBM based on system availability.
 	 */
-	cbm_ensure_valid(&d->new_ctrl, r);
+	d->new_ctrl = cbm_ensure_valid(d->new_ctrl, r);
 	/*
 	 * Assign the u32 CBM to an unsigned long to ensure that
 	 * bitmap_weight() does not access out-of-bound memory.
-- 
2.17.2

[tip:x86/cache] x86/resctrl: Cleanup cbm_ensure_valid()

[tip-bot for Reinette Chatre]

Commit-ID:  2ef085bd110c5723ca08a522608ac3468dc304bd
Gitweb:     https://git.kernel.org/tip/2ef085bd110c5723ca08a522608ac3468dc304bd
Author:     Reinette Chatre <reinette.chatre@intel.com>
AuthorDate: Mon, 24 Jun 2019 13:34:27 -0700
Committer:  Thomas Gleixner <tglx@linutronix.de>
CommitDate: Tue, 25 Jun 2019 09:26:11 +0200

x86/resctrl: Cleanup cbm_ensure_valid()

A recent fix to the cbm_ensure_valid() function left some coding style
issues that are now addressed:

- Return a value instead of using a function parameter as input and
  output
- Use if (!val) instead of if (val == 0)
- Follow reverse fir tree ordering of variable declarations

Suggested-by: Borislav Petkov <bp@alien8.de>
Signed-off-by: Reinette Chatre <reinette.chatre@intel.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Cc: fenghua.yu@intel.com
Cc: tony.luck@intel.com
Cc: hpa@zytor.com
Link: https://lkml.kernel.org/r/15ba03856f1d944468ee6f44e3fd7aa548293ede.1561408280.git.reinette.chatre@intel.com

---
 arch/x86/kernel/cpu/resctrl/rdtgroup.c | 12 ++++++------
 1 file changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/kernel/cpu/resctrl/rdtgroup.c b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
index 2f4824793798..bf3034994754 100644
--- a/arch/x86/kernel/cpu/resctrl/rdtgroup.c
+++ b/arch/x86/kernel/cpu/resctrl/rdtgroup.c
@@ -2488,21 +2488,21 @@ out_destroy:
  * modification to the CBM if the default does not satisfy the
  * requirements.
  */
-static void cbm_ensure_valid(u32 *_val, struct rdt_resource *r)
+static u32 cbm_ensure_valid(u32 _val, struct rdt_resource *r)
 {
-	unsigned long val = *_val;
 	unsigned int cbm_len = r->cache.cbm_len;
 	unsigned long first_bit, zero_bit;
+	unsigned long val = _val;
 
-	if (val == 0)
-		return;
+	if (!val)
+		return 0;
 
 	first_bit = find_first_bit(&val, cbm_len);
 	zero_bit = find_next_zero_bit(&val, cbm_len, first_bit);
 
 	/* Clear any remaining bits to ensure contiguous region */
 	bitmap_clear(&val, zero_bit, cbm_len - zero_bit);
-	*_val = (u32)val;
+	return (u32)val;
 }
 
 /*
@@ -2560,7 +2560,7 @@ static int __init_one_rdt_domain(struct rdt_domain *d, struct rdt_resource *r,
 	 * Force the initial CBM to be valid, user can
 	 * modify the CBM based on system availability.
 	 */
-	cbm_ensure_valid(&d->new_ctrl, r);
+	d->new_ctrl = cbm_ensure_valid(d->new_ctrl, r);
 	/*
 	 * Assign the u32 CBM to an unsigned long to ensure that
 	 * bitmap_weight() does not access out-of-bound memory.