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From:   Andy Lutomirski <luto@kernel.org>
To:     LKML <linux-kernel@vger.kernel.org>
Cc:     x86@kernel.org, Kees Cook <keescook@chromium.org>,
        Florian Weimer <fweimer@redhat.com>,
        Jann Horn <jannh@google.com>,
        Andy Lutomirski <luto@kernel.org>,
        Palmer Dabbelt <palmer@dabbelt.com>,
        Albert Ou <aou@eecs.berkeley.edu>,
        linux-riscv@lists.infradead.org
Subject: [PATCH] riscv: Remove gate area stubs
Date:   Wed, 26 Jun 2019 21:46:18 -0700
Message-Id: <d7f5a3b26eb4f7a41a24baf89ad70b3f37894a6e.1561610736.git.luto@kernel.org>
MIME-Version: 1.0
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Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

Since commit a6c19dfe3994 ("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>
---
 arch/riscv/include/asm/page.h |  4 ----
 arch/riscv/kernel/vdso.c      | 19 -------------------
 2 files changed, 23 deletions(-)

diff --git a/arch/riscv/include/asm/page.h b/arch/riscv/include/asm/page.h
index 8ddb6c7fedac..d3e5f6c0c21a 100644
--- a/arch/riscv/include/asm/page.h
+++ b/arch/riscv/include/asm/page.h
@@ -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 */
diff --git a/arch/riscv/kernel/vdso.c b/arch/riscv/kernel/vdso.c
index a0084c36d270..c9c21e0d5641 100644
--- a/arch/riscv/kernel/vdso.c
+++ b/arch/riscv/kernel/vdso.c
@@ -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;
-}
-- 
2.21.0