Commit 6ba9b7d8 authored Jan 30, 2008 by Andi Kleen Committed by Ingo Molnar Jan 30, 2008

x86: fix c_p_a() boot crash



fix:

> hm, i just found a failing 64-bit .config while testing your CPA
> patchset:
>
>  [    1.916541] CPA mapping 4k 0 large 2048 gb 0 x 0[0-0] miss 0
>  [    1.919874] Unable to handle kernel paging request at 000000000335aea8 RIP:
>  [    1.919874]  [<ffffffff8021d2d3>] change_page_attr+0x3/0x61
>  [    1.919874] PGD 0
>  [    1.919874] Oops: 0000 [1]
>  [    1.919874] CPU 0

This handles addresses which don't have a mem_map entry.

Signed-off-by: Andi Kleen <ak@suse.de>
Signed-off-by: Ingo Molnar <mingo@elte.hu>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>

parent aaa0e890

arch/x86/mm/pageattr-test.c

+2 −2

Original line number	Diff line number	Diff line
		@@ -177,7 +177,7 @@ static __init int exercise_pageattr(void)
		continue;
		}

		err = change_page_attr(virt_to_page(addr[i]), len[i],
		err = change_page_attr_addr(addr[i], len[i],
		pte_pgprot(pte_clrhuge(pte_clrglobal(pte0))));
		if (err < 0) {
		printk(KERN_ERR "CPA %d failed %d\n", i, err);
		@@ -212,7 +212,7 @@ static __init int exercise_pageattr(void)
		failed++;
		continue;
		}
		err = change_page_attr(virt_to_page(addr[i]), len[i],
		err = change_page_attr_addr(addr[i], len[i],
		pte_pgprot(pte_mkglobal(*pte)));
		if (err < 0) {
		printk(KERN_ERR "CPA reverting failed: %d\n", err);