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Commit 9157259d authored by Zi Yan's avatar Zi Yan Committed by David S. Miller
Browse files

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: default avatarZi Yan <zi.yan@cs.rutgers.edu>
Signed-off-by: default avatarDavid S. Miller <davem@davemloft.net>
parent 26273939

arch/sparc/include/asm/page_32.h

+2 −0
Original line number Diff line number Diff line
@@ -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)