From 22c8ca2ac256bb681be791858b35502b5d37e73b Mon Sep 17 00:00:00 2001 From: Yinghai Lu Date: Fri, 16 Nov 2012 19:39:04 -0800 Subject: x86, mm: Add alloc_low_pages(num) 32bit kmap mapping needs pages to be used for low to high. At this point those pages are still from pgt_buf_* from BRK, so it is ok now. But we want to move early_ioremap_page_table_range_init() out of init_memory_mapping() and only call it one time later, that will make page_table_range_init/page_table_kmap_check/alloc_low_page to use memblock to get page. memblock allocation for pages are from high to low. So will get panic from page_table_kmap_check() that has BUG_ON to do ordering checking. This patch add alloc_low_pages to make it possible to allocate serveral pages at first, and hand out pages one by one from low to high. Signed-off-by: Yinghai Lu Link: http://lkml.kernel.org/r/1353123563-3103-28-git-send-email-yinghai@kernel.org Cc: Andrew Morton Signed-off-by: H. Peter Anvin --- arch/x86/mm/mm_internal.h | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'arch/x86/mm/mm_internal.h') diff --git a/arch/x86/mm/mm_internal.h b/arch/x86/mm/mm_internal.h index b3f993a2555e..7e3b88ee078a 100644 --- a/arch/x86/mm/mm_internal.h +++ b/arch/x86/mm/mm_internal.h @@ -1,6 +1,10 @@ #ifndef __X86_MM_INTERNAL_H #define __X86_MM_INTERNAL_H -void *alloc_low_page(void); +void *alloc_low_pages(unsigned int num); +static inline void *alloc_low_page(void) +{ + return alloc_low_pages(1); +} #endif /* __X86_MM_INTERNAL_H */ -- cgit v1.2.3