The patch titled
Subject: kexec-provide-arch_kexec_protectunprotect_crashkres-v4
has been added to the -mm tree. Its filename is
kexec-provide-arch_kexec_protectunprotect_crashkres-v4.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/kexec-provide-arch_kexec_protectunprotect_crashkres-v4.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/kexec-provide-arch_kexec_protectunprotect_crashkres-v4.patch
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------------------------------------------------------
From: Xunlei Pang <xlpang@xxxxxxxxxx>
Subject: kexec-provide-arch_kexec_protectunprotect_crashkres-v4
v3->v4:
Add some comments according to Minfei's suggestion.
Signed-off-by: Xunlei Pang <xlpang@xxxxxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Dave Young <dyoung@xxxxxxxxxx>
Cc: Minfei Huang <mhuang@xxxxxxxxxx>
Cc: Vivek Goyal <vgoyal@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
arch/x86/kernel/machine_kexec_64.c | 16 +++++++++-------
1 file changed, 9 insertions(+), 7 deletions(-)
diff -puN arch/x86/kernel/machine_kexec_64.c~kexec-provide-arch_kexec_protectunprotect_crashkres-v4 arch/x86/kernel/machine_kexec_64.c
--- a/arch/x86/kernel/machine_kexec_64.c~kexec-provide-arch_kexec_protectunprotect_crashkres-v4
+++ a/arch/x86/kernel/machine_kexec_64.c
@@ -539,18 +539,21 @@ overflow:
}
#endif /* CONFIG_KEXEC_FILE */
-#ifdef CONFIG_KEXEC_CORE
static int
kexec_mark_range(unsigned long start, unsigned long end, bool protect)
{
struct page *page;
unsigned int nr_pages;
- if (!start || !end || start >= end)
+ /*
+ * For physical range: [start, end]. We must skip the unassigned
+ * crashk resource with zero-valued "end" member.
+ */
+ if (!end || start > end)
return 0;
page = pfn_to_page(start >> PAGE_SHIFT);
- nr_pages = (end + 1 - start) >> PAGE_SHIFT;
+ nr_pages = (end >> PAGE_SHIFT) - (start >> PAGE_SHIFT) + 1;
if (protect)
return set_pages_ro(page, nr_pages);
else
@@ -566,9 +569,9 @@ static void kexec_mark_crashkres(bool pr
/* Don't touch the control code page used in crash_kexec().*/
control = PFN_PHYS(page_to_pfn(kexec_crash_image->control_code_page));
/* Control code page is located in the 2nd page. */
- control = control + PAGE_SIZE;
- kexec_mark_range(crashk_res.start, control - 1, protect);
- kexec_mark_range(control + PAGE_SIZE, crashk_res.end, protect);
+ kexec_mark_range(crashk_res.start, control + PAGE_SIZE - 1, protect);
+ control += KEXEC_CONTROL_PAGE_SIZE;
+ kexec_mark_range(control, crashk_res.end, protect);
}
void arch_kexec_protect_crashkres(void)
@@ -580,4 +583,3 @@ void arch_kexec_unprotect_crashkres(void
{
kexec_mark_crashkres(false);
}
-#endif
_
Patches currently in -mm which might be from xlpang@xxxxxxxxxx are
kexec-introduce-a-protection-mechanism-for-the-crashkernel-reserved-memory.patch
kexec-introduce-a-protection-mechanism-for-the-crashkernel-reserved-memory-v4.patch
kexec-provide-arch_kexec_protectunprotect_crashkres.patch
kexec-provide-arch_kexec_protectunprotect_crashkres-v4.patch
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