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Date: Thu, 25 Aug 2011 17:03:02 -0700
From: Andrew Morton <akpm@...ux-foundation.org>
To: Akinobu Mita <akinobu.mita@...il.com>
Cc: linux-kernel@...r.kernel.org, linux-mm@...ck.org
Subject: Re: [PATCH -v2] debug-pagealloc: add support for highmem pages
On Thu, 25 Aug 2011 23:14:09 +0900
Akinobu Mita <akinobu.mita@...il.com> wrote:
> This adds support for highmem pages poisoning and verification to the
> debug-pagealloc feature for no-architecture support.
>
Sorry, I had a brainfart. kmap_atomic() internally does the
preempt_disable() (actually pagefault_disable()).
--- a/mm/debug-pagealloc.c~debug-pagealloc-add-support-for-highmem-pages-fix
+++ a/mm/debug-pagealloc.c
@@ -23,14 +23,11 @@ static inline bool page_poison(struct pa
static void poison_page(struct page *page)
{
- void *addr;
+ void *addr = kmap_atomic(page);
- preempt_disable();
- addr = kmap_atomic(page);
set_page_poison(page);
memset(addr, PAGE_POISON, PAGE_SIZE);
kunmap_atomic(addr);
- preempt_enable();
}
static void poison_pages(struct page *page, int n)
@@ -82,12 +79,10 @@ static void unpoison_page(struct page *p
if (!page_poison(page))
return;
- preempt_disable();
addr = kmap_atomic(page);
check_poison_mem(addr, PAGE_SIZE);
clear_page_poison(page);
kunmap_atomic(addr);
- preempt_enable();
}
static void unpoison_pages(struct page *page, int n)
_
--
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