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riscv: Remove gate area stubs 

Since commit a6c19dfe39 ("arm64,ia64,ppc,s390,sh,tile,um,x86,mm:
remove default gate area"), which predates riscv's inclusion in
Linux by almost three years, the default behavior wrt the gate area
is sane.  Remove riscv's gate area stubs.

Cc: Palmer Dabbelt <palmer@dabbelt.com>
Cc: Albert Ou <aou@eecs.berkeley.edu>
Cc: linux-riscv@lists.infradead.org
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Paul Walmsley <paul.walmsley@sifive.com>
This commit is contained in:
Andy Lutomirski 2019-06-26 21:46:18 -07:00 committed by Paul Walmsley
parent 71ec982fad
commit 556024d41f
2 changed files with 0 additions and 23 deletions
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4
arch/riscv/include/asm/page.h
View File

@ -115,8 +115,4 @@ extern unsigned long min_low_pfn;
#include <asm-generic/memory_model.h>
#include <asm-generic/getorder.h>
/* vDSO support */
/* We do define AT_SYSINFO_EHDR but don't use the gate mechanism */
#define __HAVE_ARCH_GATE_AREA
#endif /* _ASM_RISCV_PAGE_H */

19
arch/riscv/kernel/vdso.c
View File

@ -92,22 +92,3 @@ const char *arch_vma_name(struct vm_area_struct *vma)
return "[vdso]";
return NULL;
}
/*
* Function stubs to prevent linker errors when AT_SYSINFO_EHDR is defined
*/
int in_gate_area_no_mm(unsigned long addr)
{
return 0;
}
int in_gate_area(struct mm_struct *mm, unsigned long addr)
{
return 0;
}
struct vm_area_struct *get_gate_vma(struct mm_struct *mm)
{
return NULL;
}