On Fri, 4 Jan 2013, Yinghai Lu wrote: > During debugging loading kernel above 4G, found one page if is not used > in BRK with early page allocation. > > pgt_buf_top is address that can not be used, so should check if that new > end is above that top, otherwise last page will not be used. > > Fix that checking and also add print out for every allocation from BRK. > > Signed-off-by: Yinghai Lu <[email protected]>
Acked-by: Stefano Stabellini <[email protected]> > arch/x86/mm/init.c | 4 +++- > 1 file changed, 3 insertions(+), 1 deletion(-) > > diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c > index 6f85de8..c4293cf 100644 > --- a/arch/x86/mm/init.c > +++ b/arch/x86/mm/init.c > @@ -47,7 +47,7 @@ __ref void *alloc_low_pages(unsigned int num) > __GFP_ZERO, order); > } > > - if ((pgt_buf_end + num) >= pgt_buf_top) { > + if ((pgt_buf_end + num) > pgt_buf_top) { > unsigned long ret; > if (min_pfn_mapped >= max_pfn_mapped) > panic("alloc_low_page: ran out of memory"); > @@ -61,6 +61,8 @@ __ref void *alloc_low_pages(unsigned int num) > } else { > pfn = pgt_buf_end; > pgt_buf_end += num; > + printk(KERN_DEBUG "BRK [%#010lx, %#010lx] PGTABLE\n", > + pfn << PAGE_SHIFT, (pgt_buf_end << PAGE_SHIFT) - 1); > } > > for (i = 0; i < num; i++) { > -- > 1.7.10.4 > > -- > To unsubscribe from this list: send the line "unsubscribe linux-kernel" in > the body of a message to [email protected] > More majordomo info at http://vger.kernel.org/majordomo-info.html > Please read the FAQ at http://www.tux.org/lkml/ > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
