linux-kernel - [PATCH v3 10/23] arm/vdso: Remove vdso pointer from mm->context

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Date:   Fri, 11 Jun 2021 19:02:29 +0100
From:   Dmitry Safonov <dima@...sta.com>
To:     linux-kernel@...r.kernel.org
Cc:     Dmitry Safonov <0x7f454c46@...il.com>,
        Dmitry Safonov <dima@...sta.com>,
        Alexander Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Andy Lutomirski <luto@...nel.org>,
        Arnd Bergmann <arnd@...db.de>, Borislav Petkov <bp@...en8.de>,
        Catalin Marinas <catalin.marinas@....com>,
        Christophe Leroy <christophe.leroy@...roup.eu>,
        Guo Ren <guoren@...nel.org>, "H. Peter Anvin" <hpa@...or.com>,
        Ingo Molnar <mingo@...hat.com>,
        Oleg Nesterov <oleg@...hat.com>,
        Russell King <linux@...linux.org.uk>,
        Thomas Bogendoerfer <tsbogend@...ha.franken.de>,
        Thomas Gleixner <tglx@...utronix.de>,
        Vincenzo Frascino <vincenzo.frascino@....com>,
        Will Deacon <will@...nel.org>, x86@...nel.org
Subject: [PATCH v3 10/23] arm/vdso: Remove vdso pointer from mm->context

Not used any more: now sysinfo_ehdr is passed back from
arch_setup_additional_pages() to set AT_SYSINFO_EHDR tag.
.vdso_mremap() was only to track proper position of context.vdso
throughout any mremap() syscalls, remove it too.

Signed-off-by: Dmitry Safonov <dima@...sta.com>
---
 arch/arm/include/asm/mmu.h |  3 ---
 arch/arm/kernel/vdso.c     | 10 ----------
 2 files changed, 13 deletions(-)

diff --git a/arch/arm/include/asm/mmu.h b/arch/arm/include/asm/mmu.h
index 1592a4264488..2397b0a19f59 100644
--- a/arch/arm/include/asm/mmu.h
+++ b/arch/arm/include/asm/mmu.h
@@ -12,9 +12,6 @@ typedef struct {
 #endif
 	unsigned int	vmalloc_seq;
 	unsigned long	sigpage;
-#ifdef CONFIG_VDSO
-	unsigned long	vdso;
-#endif
 #ifdef CONFIG_BINFMT_ELF_FDPIC
 	unsigned long	exec_fdpic_loadmap;
 	unsigned long	interp_fdpic_loadmap;
diff --git a/arch/arm/kernel/vdso.c b/arch/arm/kernel/vdso.c
index de516f8ba85a..4b39c7d8f525 100644
--- a/arch/arm/kernel/vdso.c
+++ b/arch/arm/kernel/vdso.c
@@ -47,17 +47,8 @@ static const struct vm_special_mapping vdso_data_mapping = {
 	.pages = &vdso_data_page,
 };
 
-static int vdso_mremap(const struct vm_special_mapping *sm,
-		struct vm_area_struct *new_vma)
-{
-	current->mm->context.vdso = new_vma->vm_start;
-
-	return 0;
-}
-
 static struct vm_special_mapping vdso_text_mapping __ro_after_init = {
 	.name = "[vdso]",
-	.mremap = vdso_mremap,
 };
 
 struct elfinfo {
@@ -256,7 +247,6 @@ void arm_install_vdso(struct mm_struct *mm, unsigned long addr,
 	if (IS_ERR(vma))
 		return;
 
-	mm->context.vdso = addr;
 	*sysinfo_ehdr = addr;
 }
 
-- 
2.31.1