linux-kernel - Re: [PATCH 04/24] x86/mm/kaiser: Unmap kernel mappings from userspace page tables, core patch

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Date:   Tue, 28 Nov 2017 11:34:08 +0100
From:   Peter Zijlstra <peterz@...radead.org>
To:     Ingo Molnar <mingo@...nel.org>
Cc:     linux-kernel@...r.kernel.org,
        Dave Hansen <dave.hansen@...ux.intel.com>,
        Andy Lutomirski <luto@...capital.net>,
        Thomas Gleixner <tglx@...utronix.de>,
        "H . Peter Anvin" <hpa@...or.com>, Borislav Petkov <bp@...en8.de>,
        Linus Torvalds <torvalds@...ux-foundation.org>
Subject: Re: [PATCH 04/24] x86/mm/kaiser: Unmap kernel mappings from
 userspace page tables, core patch

On Mon, Nov 27, 2017 at 11:49:03AM +0100, Ingo Molnar wrote:
> +/*
> + * Given a kernel address, @__start_addr, copy that mapping into
> + * the user (shadow) page tables.  This may need to allocate page
> + * table pages.
> + */
> +int kaiser_add_user_map(const void *__start_addr, unsigned long size,
> +			unsigned long flags)
> +{
> +}
> +
> +int kaiser_add_user_map_ptrs(const void *__start_addr,
> +			     const void *__end_addr,
> +			     unsigned long flags)
> +{
> +}

AFAICT these here can be static..


diff --git a/arch/x86/mm/kaiser.c b/arch/x86/mm/kaiser.c
index 0ff502fa655b..f2bf074b08e5 100644
--- a/arch/x86/mm/kaiser.c
+++ b/arch/x86/mm/kaiser.c
@@ -260,8 +260,8 @@ static pte_t *kaiser_shadow_pagetable_walk(unsigned long address,
  * the user (shadow) page tables.  This may need to allocate page
  * table pages.
  */
-int kaiser_add_user_map(const void *__start_addr, unsigned long size,
-			unsigned long flags)
+static int kaiser_add_user_map(const void *__start_addr, unsigned long size,
+			       unsigned long flags)
 {
 	unsigned long start_addr = (unsigned long)__start_addr;
 	unsigned long address = start_addr & PAGE_MASK;
@@ -310,9 +310,9 @@ int kaiser_add_user_map(const void *__start_addr, unsigned long size,
 	return 0;
 }
 
-int kaiser_add_user_map_ptrs(const void *__start_addr,
-			     const void *__end_addr,
-			     unsigned long flags)
+static int kaiser_add_user_map_ptrs(const void *__start_addr,
+				    const void *__end_addr,
+				    unsigned long flags)
 {
 	return kaiser_add_user_map(__start_addr,
 				   __end_addr - __start_addr,