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x86: make sure initmem is writable

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When we free initmem, various rodata and CPA checks may have left
memory read only.. this patch ensures that the memory is writable
before we free it.

Signed-off-by: Arjan van de Ven <arjan@linux.intel.com>

Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
This commit is contained in:
Arjan van de Ven 2008-01-30 13:34:07 +01:00 committed by Ingo Molnar
parent 488fd99588
commit 3c1df68b84
2 changed files with 8 additions and 0 deletions
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7
arch/x86/mm/init_32.c
View File

@ -780,6 +780,13 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
{
unsigned long addr;
/*
* We just marked the kernel text read only above, now that
* we are going to free part of that, we need to make that
* writeable first.
*/
set_memory_rw(begin, (end - begin) >> PAGE_SHIFT);
for (addr = begin; addr < end; addr += PAGE_SIZE) {
ClearPageReserved(virt_to_page(addr));
init_page_count(virt_to_page(addr));

1
arch/x86/mm/init_64.c
View File

@ -570,6 +570,7 @@ void free_init_pages(char *what, unsigned long begin, unsigned long end)
* 2Mb kernel mapping just for this debug feature.
*/
if (begin >= __START_KERNEL_map) {
set_memory_rw(begin, (end - begin)/PAGE_SIZE);
set_memory_np(begin, (end - begin)/PAGE_SIZE);
set_memory_nx(begin, (end - begin)/PAGE_SIZE);
}