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authorLinus Torvalds <torvalds@linux-foundation.org>2018-08-26 10:13:21 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-26 10:13:21 -0700
commit2a8a2b7c49d6eb5f3348892c4676267376cfd40b (patch)
tree2342006a8a8fa0d02b147c4d4482146a9f6353f6 /arch/x86/mm
parentde3750351c0de35472299506ace61a01f2bfc567 (diff)
parent6a012288d6906fee1dbc244050ade1dafe4a9c8d (diff)
download96b-common-2a8a2b7c49d6eb5f3348892c4676267376cfd40b.tar.gz
Merge branch 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
Pull x86 fixes from Thomas Gleixner: - Correct the L1TF fallout on 32bit and the off by one in the 'too much RAM for protection' calculation. - Add a helpful kernel message for the 'too much RAM' case - Unbreak the VDSO in case that the compiler desides to use indirect jumps/calls and emits retpolines which cannot be resolved because the kernel uses its own thunks, which does not work for the VDSO. Make it use the builtin thunks. - Re-export start_thread() which was unexported when the 32/64bit implementation was unified. start_thread() is required by modular binfmt handlers. - Trivial cleanups * 'x86-urgent-for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip: x86/speculation/l1tf: Suggest what to do on systems with too much RAM x86/speculation/l1tf: Fix off-by-one error when warning that system has too much RAM x86/kvm/vmx: Remove duplicate l1d flush definitions x86/speculation/l1tf: Fix overflow in l1tf_pfn_limit() on 32bit x86/process: Re-export start_thread() x86/mce: Add notifier_block forward declaration x86/vdso: Fix vDSO build if a retpoline is emitted
Diffstat (limited to 'arch/x86/mm')
-rw-r--r--arch/x86/mm/init.c4
-rw-r--r--arch/x86/mm/mmap.c2
2 files changed, 3 insertions, 3 deletions
diff --git a/arch/x86/mm/init.c b/arch/x86/mm/init.c
index 5c32a7665492..7a8fc26c1115 100644
--- a/arch/x86/mm/init.c
+++ b/arch/x86/mm/init.c
@@ -930,7 +930,7 @@ unsigned long max_swapfile_size(void)
if (boot_cpu_has_bug(X86_BUG_L1TF)) {
/* Limit the swap file size to MAX_PA/2 for L1TF workaround */
- unsigned long l1tf_limit = l1tf_pfn_limit() + 1;
+ unsigned long long l1tf_limit = l1tf_pfn_limit();
/*
* We encode swap offsets also with 3 bits below those for pfn
* which makes the usable limit higher.
@@ -938,7 +938,7 @@ unsigned long max_swapfile_size(void)
#if CONFIG_PGTABLE_LEVELS > 2
l1tf_limit <<= PAGE_SHIFT - SWP_OFFSET_FIRST_BIT;
#endif
- pages = min_t(unsigned long, l1tf_limit, pages);
+ pages = min_t(unsigned long long, l1tf_limit, pages);
}
return pages;
}
diff --git a/arch/x86/mm/mmap.c b/arch/x86/mm/mmap.c
index f40ab8185d94..1e95d57760cf 100644
--- a/arch/x86/mm/mmap.c
+++ b/arch/x86/mm/mmap.c
@@ -257,7 +257,7 @@ bool pfn_modify_allowed(unsigned long pfn, pgprot_t prot)
/* If it's real memory always allow */
if (pfn_valid(pfn))
return true;
- if (pfn > l1tf_pfn_limit() && !capable(CAP_SYS_ADMIN))
+ if (pfn >= l1tf_pfn_limit() && !capable(CAP_SYS_ADMIN))
return false;
return true;
}