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Message-Id: <1401123682-5384-4-git-send-email-fenghua.yu@intel.com> Date: Mon, 26 May 2014 10:01:10 -0700 From: "Fenghua Yu" <fenghua.yu@...el.com> To: "H. Peter Anvin" <hpa@...ux.intel.com>, "Ingo Molnar" <mingo@...e.hu>, "Thomas Gleixner" <tglx@...utronix.de>, "Asit K Mallick" <asit.k.mallick@...el.com> Cc: "linux-kernel" <linux-kernel@...r.kernel.org>, "x86" <x86@...nel.org>, "Fenghua Yu" <fenghua.yu@...el.com> Subject: [PATCH 03/15] x86/alternative: Add alternative_input_2 From: Fenghua Yu <fenghua.yu@...el.com> Add alternative_input_2 to take two features and respective instructions. If CPU has feature2, newinstr2 is used. Otherwise, if CPU has feature1, newinstr1 is used. Otherwise, oldinstr is used. Signed-off-by: Fenghua Yu <fenghua.yu@...el.com> --- arch/x86/include/asm/alternative.h | 13 +++++++++++++ 1 file changed, 13 insertions(+) diff --git a/arch/x86/include/asm/alternative.h b/arch/x86/include/asm/alternative.h index 0a3f9c9..eb8d80b 100644 --- a/arch/x86/include/asm/alternative.h +++ b/arch/x86/include/asm/alternative.h @@ -161,6 +161,19 @@ static inline int alternatives_text_reserved(void *start, void *end) asm volatile (ALTERNATIVE(oldinstr, newinstr, feature) \ : : "i" (0), ## input) +/* + * Like alternative_input, but there are two features and respective + * instructions. + * If CPU has feature2, newinstr2 is used. + * Otherwise, if CPU has feature1, newinstr1 is used. + * Otherwise, oldinstr is used. + */ +#define alternative_input_2(oldinstr, newinstr1, feature1, newinstr2, \ + feature2, input...) \ + asm volatile(ALTERNATIVE_2(oldinstr, newinstr1, feature1, \ + newinstr2, feature2) \ + : : "i" (0), ## input) + /* Like alternative_input, but with a single output argument */ #define alternative_io(oldinstr, newinstr, feature, output, input...) \ asm volatile (ALTERNATIVE(oldinstr, newinstr, feature) \ -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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