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authorLinus Torvalds <torvalds@linux-foundation.org>2013-05-20 11:36:03 -0700
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-05-24 11:35:47 -0700
commitda9d83cf6e1f64c5dafc7c47f6ce93788bc1263a (patch)
treea81b4bdeaf4ab1de4d7bc8defe9136298d52bfe9
parent6fddcaed97292f001589c2c12878c76a394a52a4 (diff)
downloadvexpress-lsk-da9d83cf6e1f64c5dafc7c47f6ce93788bc1263a.tar.gz
x86: Fix bit corruption at CPU resume time
commit 5e427ec2d066b48a5c27b3a5a3315f7e4e729077 upstream. In commit 78d77df71510 ("x86-64, init: Do not set NX bits on non-NX capable hardware") we added the early_pmd_flags that gets the NX bit set when a CPU supports NX. However, the new variable was marked __initdata, because the main _use_ of this is in an __init routine. However, the bit setting happens from secondary_startup_64(), which is called not only at bootup, but on every secondary CPU start. Including resuming from STR and at CPU hotplug time. So the value cannot be __initdata. Reported-bisected-and-tested-by: Michal Hocko <mhocko@suse.cz> Acked-by: Peter Anvin <hpa@linux.intel.com> Cc: Fernando Luis Vázquez Cao <fernando@oss.ntt.co.jp> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--arch/x86/kernel/head64.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kernel/head64.c b/arch/x86/kernel/head64.c
index 1c68ccb50df..8f3201d59b1 100644
--- a/arch/x86/kernel/head64.c
+++ b/arch/x86/kernel/head64.c
@@ -34,7 +34,7 @@
extern pgd_t early_level4_pgt[PTRS_PER_PGD];
extern pmd_t early_dynamic_pgts[EARLY_DYNAMIC_PAGE_TABLES][PTRS_PER_PMD];
static unsigned int __initdata next_early_pgt = 2;
-pmdval_t __initdata early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
+pmdval_t early_pmd_flags = __PAGE_KERNEL_LARGE & ~(_PAGE_GLOBAL | _PAGE_NX);
/* Wipe all early page tables except for the kernel symbol map */
static void __init reset_early_page_tables(void)