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| author | Zi Yan <zi.yan@cs.rutgers.edu> | 2017-08-03 09:17:21 -0400 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2017-08-10 15:03:57 -0700 |
| commit | 9157259d16a8ee8116a98d32f29b797689327e8d (patch) | |
| tree | 9e6be0a3afafd94057c375dc241ccee9179313c4 /arch | |
| parent | 26273939ace935dd7553b31d279eab30b40f7b9a (diff) | |
| download | linux-0-day-9157259d16a8ee8116a98d32f29b797689327e8d.tar.gz linux-0-day-9157259d16a8ee8116a98d32f29b797689327e8d.tar.xz | |
mm: add pmd_t initializer __pmd() to work around a GCC bug.
THP migration is added but only supports x86_64 at the moment. For all
other architectures, swp_entry_to_pmd() only returns a zero pmd_t.
Due to a GCC zero initializer bug #53119, the standard (pmd_t){0}
initializer is not accepted by all GCC versions. __pmd() is a feasible
workaround. In addition, sparc32's pmd_t is an array instead of a single
value, so we need (pmd_t){ {0}, } instead of (pmd_t){0}. Thus,
a different __pmd() definition is needed in sparc32.
Signed-off-by: Zi Yan <zi.yan@cs.rutgers.edu>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/include/asm/page_32.h | 2 |
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/sparc/include/asm/page_32.h b/arch/sparc/include/asm/page_32.h index 0efd0583a8c9d..6249214148c24 100644 --- a/arch/sparc/include/asm/page_32.h +++ b/arch/sparc/include/asm/page_32.h @@ -68,6 +68,7 @@ typedef struct { unsigned long iopgprot; } iopgprot_t; #define iopgprot_val(x) ((x).iopgprot) #define __pte(x) ((pte_t) { (x) } ) +#define __pmd(x) ((pmd_t) { { (x) }, }) #define __iopte(x) ((iopte_t) { (x) } ) #define __pgd(x) ((pgd_t) { (x) } ) #define __ctxd(x) ((ctxd_t) { (x) } ) @@ -95,6 +96,7 @@ typedef unsigned long iopgprot_t; #define iopgprot_val(x) (x) #define __pte(x) (x) +#define __pmd(x) ((pmd_t) { { (x) }, }) #define __iopte(x) (x) #define __pgd(x) (x) #define __ctxd(x) (x) |