lkml.org 
[lkml]   [2012]   [Nov]   [28]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH v5 13/13] x86, mm: Fix page table early allocation offset checking
Date
During debug load kernel above 4G, found one page if is not used in BRK
and it should be with early page allocation.

Fix that checking and also add print out for every allocation from BRK
page table allocation.

Signed-off-by: Yinghai Lu <yinghai@kernel.org>
---
arch/x86/mm/init.c | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)

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++) {
--
1.7.7


\
 
 \ /
  Last update: 2012-11-28 09:41    [W:0.156 / U:0.228 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site