linux-kernel - Re: [PATCHv8 14/30] x86: Consolidate port I/O helpers

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Date:   Sun, 10 Apr 2022 23:00:25 +0300
From:   "Kirill A. Shutemov" <kirill@...temov.name>
To:     Borislav Petkov <bp@...en8.de>
Cc:     "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>,
        tglx@...utronix.de, mingo@...hat.com, dave.hansen@...el.com,
        luto@...nel.org, peterz@...radead.org,
        sathyanarayanan.kuppuswamy@...ux.intel.com, aarcange@...hat.com,
        ak@...ux.intel.com, dan.j.williams@...el.com, david@...hat.com,
        hpa@...or.com, jgross@...e.com, jmattson@...gle.com,
        joro@...tes.org, jpoimboe@...hat.com, knsathya@...nel.org,
        pbonzini@...hat.com, sdeep@...are.com, seanjc@...gle.com,
        tony.luck@...el.com, vkuznets@...hat.com, wanpengli@...cent.com,
        thomas.lendacky@....com, brijesh.singh@....com, x86@...nel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCHv8 14/30] x86: Consolidate port I/O helpers

On Sun, Apr 10, 2022 at 12:58:17PM +0200, Borislav Petkov wrote:
> On Wed, Apr 06, 2022 at 02:29:23AM +0300, Kirill A. Shutemov wrote:
> > There are two implementations of port I/O helpers: one in the kernel and
> > one in the boot stub.
> > 
> > Move the helpers required for both to <asm/shared/io.h> and use the one
> > implementation everywhere.
> > 
> > Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
> > Reviewed-by: Thomas Gleixner <tglx@...utronix.de>
> > ---
> >  arch/x86/boot/boot.h             | 35 +-------------------------------
> >  arch/x86/boot/compressed/misc.h  |  2 +-
> >  arch/x86/include/asm/io.h        | 22 ++------------------
> >  arch/x86/include/asm/shared/io.h | 34 +++++++++++++++++++++++++++++++
> >  4 files changed, 38 insertions(+), 55 deletions(-)
> >  create mode 100644 arch/x86/include/asm/shared/io.h
> 
> This complains with clang-13 here, config attached.
> 
> And yap, this is the damn include hell I keep talking about. That
> lib/kalsr.c thing includes the kernel proper io.h header ...

Right. <asm/shared/io.h> is enough for lib/kaslr.c.

What about this:

>From 164de295599f8befa2ee1ff05dc03542c02b0800 Mon Sep 17 00:00:00 2001
From: "Kirill A. Shutemov" <kirill.shutemov@...ux.intel.com>
Date: Sun, 10 Apr 2022 22:49:28 +0300
Subject: [PATCH] x86/kaslr: Fix build warning in KASLR code in boot stub

lib/kaslr.c used by both the main kernel and the boot stub. It includes
<asm/io.h> that intended to be used in the main kernel. It leads to
build warnings like this:

	warning: implicit declaration of function 'outl' is invalid in
	C99 [-Wimplicit-function-declaration]

Replace <asm/io.h> with <asm/shared/io.h> which is suitable for both
cases.

Signed-off-by: Kirill A. Shutemov <kirill.shutemov@...ux.intel.com>
Fixes: 1e8f93e18379 ("x86: Consolidate port I/O helpers")
---
 arch/x86/lib/kaslr.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/arch/x86/lib/kaslr.c b/arch/x86/lib/kaslr.c
index 2b3eb8c948a3..a58f451a7dd3 100644
--- a/arch/x86/lib/kaslr.c
+++ b/arch/x86/lib/kaslr.c
@@ -11,7 +11,7 @@
 #include <asm/msr.h>
 #include <asm/archrandom.h>
 #include <asm/e820/api.h>
-#include <asm/io.h>
+#include <asm/shared/io.h>
 
 /*
  * When built for the regular kernel, several functions need to be stubbed out
-- 
 Kirill A. Shutemov