linux-kernel - [RFC][PATCH 22/34] x86/cpu: Move CLFLUSH size into global config

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Date: Thu, 22 Feb 2024 10:39:55 -0800
From: Dave Hansen <dave.hansen@...ux.intel.com>
To: linux-kernel@...r.kernel.org
Cc: kirill.shutemov@...ux.intel.com,pbonzini@...hat.com,tglx@...utronix.de,x86@...nel.org,bp@...en8.de,Dave Hansen <dave.hansen@...ux.intel.com>
Subject: [RFC][PATCH 22/34] x86/cpu: Move CLFLUSH size into global config


From: Dave Hansen <dave.hansen@...ux.intel.com>

x86_clflush_size is maintained per-cpu despite being global configuration.

Move it to 'x86_config'.

Signed-off-by: Dave Hansen <dave.hansen@...ux.intel.com>
---

 b/arch/x86/include/asm/processor.h |    4 ++--
 b/arch/x86/kernel/cpu/common.c     |    2 +-
 2 files changed, 3 insertions(+), 3 deletions(-)

diff -puN arch/x86/include/asm/processor.h~bsp-clflush_size arch/x86/include/asm/processor.h
--- a/arch/x86/include/asm/processor.h~bsp-clflush_size	2024-02-22 10:08:59.208875301 -0800
+++ b/arch/x86/include/asm/processor.h	2024-02-22 10:08:59.212875458 -0800
@@ -148,7 +148,6 @@ struct cpuinfo_x86 {
 	u64			ppin;
 	/* cpuid returned max cores value: */
 	u16			x86_max_cores;
-	u16			x86_clflush_size;
 	/* number of cores as seen by the OS: */
 	u16			booted_cores;
 	/* Index into per_cpu list: */
@@ -191,6 +190,7 @@ struct x86_sys_config {
 	/* Address bits supported by all processors */
 	u8	phys_bits;
 	u8	virt_bits;
+	u16	clflush_size;
 };
 
 extern struct x86_sys_config x86_config;
@@ -812,7 +812,7 @@ static inline u8 x86_virt_bits(void)
 
 static inline u8 x86_clflush_size(void)
 {
-	return boot_cpu_data.x86_clflush_size;
+	return x86_config.clflush_size;
 }
 
 #endif /* _ASM_X86_PROCESSOR_H */
diff -puN arch/x86/kernel/cpu/common.c~bsp-clflush_size arch/x86/kernel/cpu/common.c
--- a/arch/x86/kernel/cpu/common.c~bsp-clflush_size	2024-02-22 10:08:59.208875301 -0800
+++ b/arch/x86/kernel/cpu/common.c	2024-02-22 10:08:59.212875458 -0800
@@ -1136,7 +1136,7 @@ void get_cpu_address_sizes(struct cpuinf
 				x86_config.phys_bits = 36;
 		}
 	}
-	c->x86_clflush_size = detect_clflush_size(c);
+	x86_config.clflush_size = detect_clflush_size(c);
 
 	c->x86_cache_bits = x86_config.phys_bits;
 
_