AuxXxilium/linux_dsm_epyc7002
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Merge branch 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip

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Pull x86 cache resource control update from Ingo Molnar:
 "Two cleanup patches"

* 'x86-cache-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
  x86/resctrl: Cleanup cbm_ensure_valid()
  x86/resctrl: Use _ASM_BX to avoid ifdeffery
This commit is contained in:
Linus Torvalds 2019-07-08 17:25:53 -07:00
commit 6cfcdad763
2 changed files with 7 additions and 11 deletions
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6
arch/x86/kernel/cpu/resctrl/pseudo_lock.c
View File

@ -431,11 +431,7 @@ static int pseudo_lock_fn(void *_rdtgrp)
#else
register unsigned int line_size asm("esi");
register unsigned int size asm("edi");
#ifdef CONFIG_X86_64
register void *mem_r asm("rbx");
#else
register void *mem_r asm("ebx");
#endif /* CONFIG_X86_64 */
register void *mem_r asm(_ASM_BX);
#endif /* CONFIG_KASAN */
/*

12
arch/x86/kernel/cpu/resctrl/rdtgroup.c
View File

@ -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.