linux-kernel - Re: [PATCH] x86/speculation: Remove the extra ifdef around CALL

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Message-ID: <cujhiug3ojp2z7hh66kipue5wcugbrcogo7yofse7sfxphgqfg@6iqg3rghixfi>
Date: Fri, 21 Mar 2025 00:15:59 -0700
From: Josh Poimboeuf <jpoimboe@...nel.org>
To: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, 
	Andrew Cooper <andrew.cooper3@...rix.com>
Subject: Re: [PATCH] x86/speculation: Remove the extra ifdef around
 CALL_NOSPEC

On Thu, Mar 20, 2025 at 11:13:15AM -0700, Pawan Gupta wrote:
> Commit 010c4a461c1d ("x86/speculation: Simplify and make CALL_NOSPEC
> consistent") added an ifdef CONFIG_MITIGATION_RETPOLINE around the
> CALL_NOSPEC definition. This is not required as this code is already under
> a larger ifdef.
> 
> Remove the extra ifdef, no functional change.
> 
> vmlinux size remains same before and after this change.
> 
> CONFIG_MITIGATION_RETPOLINE=y:
>     text	   data	    bss	    dec		hex	filename
> 25434752	7342290	2301212	35078254	217406e	vmlinux.before
> 25434752	7342290	2301212	35078254	217406e	vmlinux.after
> 
>  # CONFIG_MITIGATION_RETPOLINE is not set:
>     text	   data	    bss	    dec		hex	filename
> 22943094	6214994	1550152	30708240	1d49210	vmlinux.before
> 22943094	6214994	1550152	30708240	1d49210	vmlinux.after
> 
> Signed-off-by: Pawan Gupta <pawan.kumar.gupta@...ux.intel.com>

Reviewed-by: Josh Poimboeuf <jpoimboe@...nel.org>

-- 
Josh