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x86: Cleanup highmap after brk is concluded

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Now cleanup_highmap actually is in two steps: one is early in head64.c
and only clears above _end; a second one is in init_memory_mapping() and
tries to clean from _brk_end to _end.
It should check if those boundaries are PMD_SIZE aligned but currently
does not.
Also init_memory_mapping() is called several times for numa or memory
hotplug, so we really should not handle initial kernel mappings there.

This patch moves cleanup_highmap() down after _brk_end is settled so
we can do everything in one step.
Also we honor max_pfn_mapped in the implementation of cleanup_highmap.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
LKML-Reference: <alpine.DEB.2.00.1103171739050.3382@kaball-desktop>
Signed-off-by: H. Peter Anvin <hpa@zytor.com>
This commit is contained in:
Yinghai Lu
2011-02-18 11:30:30 +00:00
committed by H. Peter Anvin
parent 4981d01ead
commit e5f15b45dd
3 changed files with 9 additions and 30 deletions
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25
arch/x86/kernel/setup.c
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@ -294,30 +294,11 @@ static void __init init_gbpages(void)
else
direct_gbpages = 0;
}
static void __init cleanup_highmap_brk_end(void)
{
pud_t *pud;
pmd_t *pmd;
mmu_cr4_features = read_cr4();
/*
* _brk_end cannot change anymore, but it and _end may be
* located on different 2M pages. cleanup_highmap(), however,
* can only consider _end when it runs, so destroy any
* mappings beyond _brk_end here.
*/
pud = pud_offset(pgd_offset_k(_brk_end), _brk_end);
pmd = pmd_offset(pud, _brk_end - 1);
while (++pmd <= pmd_offset(pud, (unsigned long)_end - 1))
pmd_clear(pmd);
}
#else
static inline void init_gbpages(void)
{
}
static inline void cleanup_highmap_brk_end(void)
static void __init cleanup_highmap(void)
{
}
#endif
@ -330,8 +311,6 @@ static void __init reserve_brk(void)
/* Mark brk area as locked down and no longer taking any
new allocations */
_brk_start = 0;
cleanup_highmap_brk_end();
}
#ifdef CONFIG_BLK_DEV_INITRD
@ -950,6 +929,8 @@ void __init setup_arch(char **cmdline_p)
*/
reserve_brk();
cleanup_highmap();
memblock.current_limit = get_max_mapped();
memblock_x86_fill();