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Date: Mon, 15 Jan 2018 11:15:54 -0600
From: Josh Poimboeuf <jpoimboe@redhat.com>
To: Peter Zijlstra <peterz@infradead.org>
Cc: David Woodhouse <dwmw2@infradead.org>,
        linux-kernel@vger.kernel.org, Dave Hansen <dave.hansen@intel.com>,
        Ashok Raj <ashok.raj@intel.com>,
        Thomas Gleixner <tglx@linutronix.de>,
        Tim Chen <tim.c.chen@linux.intel.com>,
        Andy Lutomirski <luto@kernel.org>,
        Linus Torvalds <torvalds@linux-foundation.org>,
        Greg KH <gregkh@linuxfoundation.org>,
        Andrea Arcangeli <aarcange@redhat.com>,
        Andi Kleen <ak@linux.intel.com>,
        Arjan Van De Ven <arjan.van.de.ven@intel.com>,
        Dan Williams <dan.j.williams@intel.com>,
        Paolo Bonzini <pbonzini@redhat.com>,
        Jun Nakajima <jun.nakajima@intel.com>,
        Asit Mallick <asit.k.mallick@intel.com>,
        Borislav Petkov <bp@alien8.de>
Subject: Re: [PATCH 4/4] x86: Reindent _static_cpu_has
Message-ID: <20180115171554.35c4zhwiry4a7auq@treble>
References: <20180115164428.498966552@infradead.org>
 <20180115164909.949786209@infradead.org>
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On Mon, Jan 15, 2018 at 05:44:32PM +0100, Peter Zijlstra wrote:
> Because its daft..
> 
> Cc: Josh Poimboeuf <jpoimboe@redhat.com>
> Cc: Thomas Gleixner <tglx@linutronix.de>
> Cc: Borislav Petkov <bp@alien8.de>
> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
> ---
>  arch/x86/include/asm/cpufeature.h |   78 +++++++++++++++++++-------------------
>  1 file changed, 39 insertions(+), 39 deletions(-)
> 
> --- a/arch/x86/include/asm/cpufeature.h
> +++ b/arch/x86/include/asm/cpufeature.h
> @@ -145,45 +145,45 @@ extern void clear_cpu_cap(struct cpuinfo
>   */
>  static __always_inline __pure bool _static_cpu_has(u16 bit)
>  {
> -		asm_volatile_goto("1: jmp 6f\n"
> -			 "2:\n"
> -			 ".skip -(((5f-4f) - (2b-1b)) > 0) * "
> -			         "((5f-4f) - (2b-1b)),0x90\n"
> -			 "3:\n"
> -			 ".section .altinstructions,\"a\"\n"
> -			 " .long 1b - .\n"		/* src offset */
> -			 " .long 4f - .\n"		/* repl offset */
> -			 " .word %P1\n"			/* always replace */
> -			 " .byte 3b - 1b\n"		/* src len */
> -			 " .byte 5f - 4f\n"		/* repl len */
> -			 " .byte 3b - 2b\n"		/* pad len */
> -			 ".previous\n"
> -			 ".section .altinstr_replacement,\"ax\"\n"
> -			 "4: jmp %l[t_no]\n"
> -			 "5:\n"
> -			 ".previous\n"
> -			 ".section .altinstructions,\"a\"\n"
> -			 " .long 1b - .\n"		/* src offset */
> -			 " .long 0\n"			/* no replacement */
> -			 " .word %P0\n"			/* feature bit */
> -			 " .byte 3b - 1b\n"		/* src len */
> -			 " .byte 0\n"			/* repl len */
> -			 " .byte 0\n"			/* pad len */
> -			 ".previous\n"
> -			 ".section .altinstr_aux,\"ax\"\n"
> -			 "6:\n"
> -			 " testb %[bitnum],%[cap_byte]\n"
> -			 " jnz %l[t_yes]\n"
> -			 " jmp %l[t_no]\n"
> -			 ".previous\n"
> -			 : : "i" (bit), "i" (X86_FEATURE_ALWAYS),
> -			     [bitnum] "i" (1 << (bit & 7)),
> -			     [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
> -			 : : t_yes, t_no);
> -	t_yes:
> -		return true;
> -	t_no:
> -		return false;
> +	asm_volatile_goto("1: jmp 6f\n"
> +		 "2:\n"
> +		 ".skip -(((5f-4f) - (2b-1b)) > 0) * "
> +			 "((5f-4f) - (2b-1b)),0x90\n"
> +		 "3:\n"
> +		 ".section .altinstructions,\"a\"\n"
> +		 " .long 1b - .\n"		/* src offset */
> +		 " .long 4f - .\n"		/* repl offset */
> +		 " .word %P1\n"			/* always replace */
> +		 " .byte 3b - 1b\n"		/* src len */
> +		 " .byte 5f - 4f\n"		/* repl len */
> +		 " .byte 3b - 2b\n"		/* pad len */
> +		 ".previous\n"
> +		 ".section .altinstr_replacement,\"ax\"\n"
> +		 "4: jmp %l[t_no]\n"
> +		 "5:\n"
> +		 ".previous\n"
> +		 ".section .altinstructions,\"a\"\n"
> +		 " .long 1b - .\n"		/* src offset */
> +		 " .long 0\n"			/* no replacement */
> +		 " .word %P0\n"			/* feature bit */
> +		 " .byte 3b - 1b\n"		/* src len */
> +		 " .byte 0\n"			/* repl len */
> +		 " .byte 0\n"			/* pad len */
> +		 ".previous\n"
> +		 ".section .altinstr_aux,\"ax\"\n"
> +		 "6:\n"
> +		 " testb %[bitnum],%[cap_byte]\n"
> +		 " jnz %l[t_yes]\n"
> +		 " jmp %l[t_no]\n"
> +		 ".previous\n"
> +		 : : "i" (bit), "i" (X86_FEATURE_ALWAYS),
> +		     [bitnum] "i" (1 << (bit & 7)),
> +		     [cap_byte] "m" (((const char *)boot_cpu_data.x86_capability)[bit >> 3])
> +		 : : t_yes, t_no);
> +t_yes:
> +	return true;
> +t_no:
> +	return false;

While you're at it, might as well convert the feature bit constraints to
have names like %P[name] instead of %P0 and %P1?

-- 
Josh