linux-kernel - [PATCH 2/2] x86/vdso: Remove a stale/misleading comment from the linker script

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Message-Id: <20181204161741.12292-3-sean.j.christopherson@intel.com>
Date:   Tue,  4 Dec 2018 08:17:41 -0800
From:   Sean Christopherson <sean.j.christopherson@...el.com>
To:     Andy Lutomirski <luto@...nel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>, Borislav Petkov <bp@...en8.de>,
        x86@...nel.org
Cc:     "H. Peter Anvin" <hpa@...or.com>, linux-kernel@...r.kernel.org,
        Andy Lutomirski <luto@...capital.net>
Subject: [PATCH 2/2] x86/vdso: Remove a stale/misleading comment from the linker script

Once upon a time, vdso2c aggressively stripped data from the vDSO
image when generating the final userspace image.  This included
stripping the .altinstructions and .altinstr_replacement sections.
Eventually, the stripping process reverted to "objdump -S" and no
longer removed the aforementioned sections, but the comment remained.

Keeping the .alt* sections at the end of the PT_LOAD segment is no
longer necessary, but there's no harm in doing so and it's a helpful
reminder that they don't need to be included in the final vDSO image,
i.e. someone may want to take another stab at zapping/stripping the
unneeded sections.

Fixes: da861e18eccc ("x86, vdso: Get rid of the fake section mechanism")
Cc: Andy Lutomirski <luto@...capital.net>
Signed-off-by: Sean Christopherson <sean.j.christopherson@...el.com>
---
 arch/x86/entry/vdso/vdso-layout.lds.S | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/x86/entry/vdso/vdso-layout.lds.S b/arch/x86/entry/vdso/vdso-layout.lds.S
index 0cedc905c8d6..93c6dc7812d0 100644
--- a/arch/x86/entry/vdso/vdso-layout.lds.S
+++ b/arch/x86/entry/vdso/vdso-layout.lds.S
@@ -65,11 +65,6 @@ SECTIONS

 	.text		: { *(.text*) }			:text	=0x90909090,

-	/*
-	 * At the end so that eu-elflint stays happy when vdso2c strips
-	 * these.  A better implementation would avoid allocating space
-	 * for these.
-	 */
 	.altinstructions	: { *(.altinstructions) }	:text
 	.altinstr_replacement	: { *(.altinstr_replacement) }	:text

-- 
2.19.2