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Merge branch 'for-3.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu

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Pull two percpu fixes from Tejun Heo:
 "One adds missing KERN_CONT on split printk()s and the other makes
  the percpu allocator avoid using PMD_SIZE as atom_size on x86_32.

  Using PMD_SIZE led to vmalloc area exhaustion on certain
  configurations (x86_32 android) and the only cost of using PAGE_SIZE
  instead is static percpu area not being aligned to large page
  mapping."

* 'for-3.4-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/tj/percpu:
  percpu, x86: don't use PMD_SIZE as embedded atom_size on 32bit
  percpu: use KERN_CONT in pcpu_dump_alloc_info()
This commit is contained in:
Linus Torvalds 2012-05-08 11:06:07 -07:00
commit e9b19cd43f
2 changed files with 18 additions and 6 deletions
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14
arch/x86/kernel/setup_percpu.c
View file

@ -185,10 +185,22 @@ void __init setup_per_cpu_areas(void)
#endif
rc = -EINVAL;
if (pcpu_chosen_fc != PCPU_FC_PAGE) {
const size_t atom_size = cpu_has_pse ? PMD_SIZE : PAGE_SIZE;
const size_t dyn_size = PERCPU_MODULE_RESERVE +
PERCPU_DYNAMIC_RESERVE - PERCPU_FIRST_CHUNK_RESERVE;
size_t atom_size;
/*
* On 64bit, use PMD_SIZE for atom_size so that embedded
* percpu areas are aligned to PMD. This, in the future,
* can also allow using PMD mappings in vmalloc area. Use
* PAGE_SIZE on 32bit as vmalloc space is highly contended
* and large vmalloc area allocs can easily fail.
*/
#ifdef CONFIG_X86_64
atom_size = PMD_SIZE;
#else
atom_size = PAGE_SIZE;
#endif
rc = pcpu_embed_first_chunk(PERCPU_FIRST_CHUNK_RESERVE,
dyn_size, atom_size,
pcpu_cpu_distance,

10
mm/percpu.c
View file

@ -1132,20 +1132,20 @@ static void pcpu_dump_alloc_info(const char *lvl,
for (alloc_end += gi->nr_units / upa;
alloc < alloc_end; alloc++) {
if (!(alloc % apl)) {
printk("\n");
printk(KERN_CONT "\n");
printk("%spcpu-alloc: ", lvl);
}
printk("[%0*d] ", group_width, group);
printk(KERN_CONT "[%0*d] ", group_width, group);
for (unit_end += upa; unit < unit_end; unit++)
if (gi->cpu_map[unit] != NR_CPUS)
printk("%0*d ", cpu_width,
printk(KERN_CONT "%0*d ", cpu_width,
gi->cpu_map[unit]);
else
printk("%s ", empty_str);
printk(KERN_CONT "%s ", empty_str);
}
}
printk("\n");
printk(KERN_CONT "\n");
}
/**