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x86/resctrl: Cleanup cbm_ensure_valid()

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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
This commit is contained in:
Reinette Chatre 2019-06-24 13:34:27 -07:00 committed by Thomas Gleixner
parent 4fedcde702
commit 2ef085bd11
1 changed files with 6 additions and 6 deletions
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12
arch/x86/kernel/cpu/resctrl/rdtgroup.c
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@ -2488,21 +2488,21 @@ 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;
}
/*
@ -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.