3.16.57-rc1 review patch. If anyone has any objections, please let me know.
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From: Jan Beulich JBeulich@suse.com
commit 842cef9113c2120f74f645111ded1e020193d84c upstream.
Just like pte_{set,clear}_flags() their PMD and PUD counterparts should not do any address translation. This was outright wrong under Xen (causing a dead boot with no useful output on "suitable" systems), and produced needlessly more complicated code (even if just slightly) when paravirt was enabled.
Signed-off-by: Jan Beulich jbeulich@suse.com Reviewed-by: Juergen Gross jgross@suse.com Acked-by: Thomas Gleixner tglx@linutronix.de Cc: Andy Lutomirski luto@kernel.org Cc: Boris Ostrovsky boris.ostrovsky@oracle.com Cc: Borislav Petkov bp@alien8.de Cc: Brian Gerst brgerst@gmail.com Cc: Denys Vlasenko dvlasenk@redhat.com Cc: H. Peter Anvin hpa@zytor.com Cc: Josh Poimboeuf jpoimboe@redhat.com Cc: Linus Torvalds torvalds@linux-foundation.org Cc: Peter Zijlstra peterz@infradead.org Link: http://lkml.kernel.org/r/5A8AF1BB02000078001A91C3@prv-mh.provo.novell.com Signed-off-by: Ingo Molnar mingo@kernel.org [bwh: Backported to 3.16: - There aren't any pud_{set,clear}_flags() functions - There's no p4d level] Signed-off-by: Ben Hutchings ben@decadent.org.uk --- --- a/arch/x86/include/asm/pgtable.h +++ b/arch/x86/include/asm/pgtable.h @@ -263,14 +263,14 @@ static inline pmd_t pmd_set_flags(pmd_t { pmdval_t v = native_pmd_val(pmd);
- return __pmd(v | set); + return native_make_pmd(v | set); }
static inline pmd_t pmd_clear_flags(pmd_t pmd, pmdval_t clear) { pmdval_t v = native_pmd_val(pmd);
- return __pmd(v & ~clear); + return native_make_pmd(v & ~clear); }
static inline pmd_t pmd_mkold(pmd_t pmd) --- a/arch/x86/include/asm/pgtable_types.h +++ b/arch/x86/include/asm/pgtable_types.h @@ -321,6 +321,11 @@ static inline pmdval_t native_pmd_val(pm #else #include <asm-generic/pgtable-nopmd.h>
+static inline pmd_t native_make_pmd(pmdval_t val) +{ + return (pmd_t) { .pud.pgd = native_make_pgd(val) }; +} + static inline pmdval_t native_pmd_val(pmd_t pmd) { return native_pgd_val(pmd.pud.pgd);