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From:   Juergen Gross <jgross@suse.com>
To:     linux-kernel@vger.kernel.org, xen-devel@lists.xenproject.org,
        x86@kernel.org, virtualization@lists.linux-foundation.org
Cc:     akataria@vmware.com, rusty@rustcorp.com.au,
        boris.ostrovsky@oracle.com, hpa@zytor.com, tglx@linutronix.de,
        mingo@redhat.com, Juergen Gross <jgross@suse.com>
Subject: [PATCH 03/10] x86/paravirt: remove clobbers from struct paravirt_patch_site
Date:   Fri, 10 Aug 2018 13:52:45 +0200
Message-Id: <20180810115252.18213-4-jgross@suse.com>
In-Reply-To: <20180810115252.18213-1-jgross@suse.com>
References: <20180810115252.18213-1-jgross@suse.com>
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

There is no need any longer to store the clobbers in struct
paravirt_patch_site. Remove clobbers from the struct and from the
related macros.

While at it fix some lines longer than 80 characters.

Signed-off-by: Juergen Gross <jgross@suse.com>
---
 arch/x86/include/asm/paravirt.h       | 33 +++++++++++++++------------------
 arch/x86/include/asm/paravirt_types.h |  1 -
 2 files changed, 15 insertions(+), 19 deletions(-)

diff --git a/arch/x86/include/asm/paravirt.h b/arch/x86/include/asm/paravirt.h
index d49bbf4bb5c8..76b4b5c056f3 100644
--- a/arch/x86/include/asm/paravirt.h
+++ b/arch/x86/include/asm/paravirt.h
@@ -822,7 +822,7 @@ extern void default_banner(void);
 
 #else  /* __ASSEMBLY__ */
 
-#define _PVSITE(ptype, clobbers, ops, word, algn)	\
+#define _PVSITE(ptype, ops, word, algn)		\
 771:;						\
 	ops;					\
 772:;						\
@@ -831,7 +831,6 @@ extern void default_banner(void);
 	 word 771b;				\
 	 .byte ptype;				\
 	 .byte 772b-771b;			\
-	 .short clobbers;			\
 	.popsection
 
 
@@ -864,7 +863,7 @@ extern void default_banner(void);
 	COND_POP(set, CLBR_RAX, rax)
 
 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 8)
-#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .quad, 8)
+#define PARA_SITE(ptype, ops)	_PVSITE(ptype, ops, .quad, 8)
 #define PARA_INDIRECT(addr)	*addr(%rip)
 #else
 #define PV_SAVE_REGS(set)			\
@@ -879,26 +878,26 @@ extern void default_banner(void);
 	COND_POP(set, CLBR_EAX, eax)
 
 #define PARA_PATCH(struct, off)        ((PARAVIRT_PATCH_##struct + (off)) / 4)
-#define PARA_SITE(ptype, clobbers, ops) _PVSITE(ptype, clobbers, ops, .long, 4)
+#define PARA_SITE(ptype, ops)	_PVSITE(ptype, ops, .long, 4)
 #define PARA_INDIRECT(addr)	*%cs:addr
 #endif
 
 #define INTERRUPT_RETURN						\
-	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret), CLBR_NONE,	\
-		  ANNOTATE_RETPOLINE_SAFE;					\
+	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_iret),			\
+		  ANNOTATE_RETPOLINE_SAFE;				\
 		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_iret);)
 
 #define DISABLE_INTERRUPTS(clobbers)					\
-	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable), clobbers, \
+	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_disable),		\
 		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);		\
-		  ANNOTATE_RETPOLINE_SAFE;					\
+		  ANNOTATE_RETPOLINE_SAFE;				\
 		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_disable);	\
 		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 
 #define ENABLE_INTERRUPTS(clobbers)					\
-	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable), clobbers,	\
+	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_irq_enable),		\
 		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);		\
-		  ANNOTATE_RETPOLINE_SAFE;					\
+		  ANNOTATE_RETPOLINE_SAFE;				\
 		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_irq_enable);	\
 		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 
@@ -916,8 +915,7 @@ extern void default_banner(void);
  * inlined, or the swapgs instruction must be trapped and emulated.
  */
 #define SWAPGS_UNSAFE_STACK						\
-	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,	\
-		  swapgs)
+	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), swapgs)
 
 /*
  * Note: swapgs is very special, and in practise is either going to be
@@ -926,8 +924,8 @@ extern void default_banner(void);
  * it.
  */
 #define SWAPGS								\
-	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs), CLBR_NONE,	\
-		  ANNOTATE_RETPOLINE_SAFE;					\
+	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_swapgs),		\
+		  ANNOTATE_RETPOLINE_SAFE;				\
 		  call PARA_INDIRECT(pv_cpu_ops+PV_CPU_swapgs);		\
 		 )
 
@@ -937,15 +935,14 @@ extern void default_banner(void);
 
 #define USERGS_SYSRET64							\
 	PARA_SITE(PARA_PATCH(pv_cpu_ops, PV_CPU_usergs_sysret64),	\
-		  CLBR_NONE,						\
-		  ANNOTATE_RETPOLINE_SAFE;					\
+		  ANNOTATE_RETPOLINE_SAFE;				\
 		  jmp PARA_INDIRECT(pv_cpu_ops+PV_CPU_usergs_sysret64);)
 
 #ifdef CONFIG_DEBUG_ENTRY
 #define SAVE_FLAGS(clobbers)                                        \
-	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_save_fl), clobbers, \
+	PARA_SITE(PARA_PATCH(pv_irq_ops, PV_IRQ_save_fl),	    \
 		  PV_SAVE_REGS(clobbers | CLBR_CALLEE_SAVE);        \
-		  ANNOTATE_RETPOLINE_SAFE;				    \
+		  ANNOTATE_RETPOLINE_SAFE;			    \
 		  call PARA_INDIRECT(pv_irq_ops+PV_IRQ_save_fl);    \
 		  PV_RESTORE_REGS(clobbers | CLBR_CALLEE_SAVE);)
 #endif
diff --git a/arch/x86/include/asm/paravirt_types.h b/arch/x86/include/asm/paravirt_types.h
index f6e24e78633b..b900088cd244 100644
--- a/arch/x86/include/asm/paravirt_types.h
+++ b/arch/x86/include/asm/paravirt_types.h
@@ -678,7 +678,6 @@ struct paravirt_patch_site {
 	u8 *instr; 		/* original instructions */
 	u8 instrtype;		/* type of this instruction */
 	u8 len;			/* length of original instruction */
-	u16 clobbers;		/* what registers you may clobber */
 };
 
 extern struct paravirt_patch_site __parainstructions[],
-- 
2.13.7