[tip: x86/fsgsbase] x86/fsgsbase: Replace static_cpu_has() with boot_cpu_has()

[tip-bot2 for Borislav Petkov]

The following commit has been merged into the x86/fsgsbase branch of tip:

Commit-ID:     5f1dd4dda5c8796c405e856aaa11e187f6885924
Gitweb:        https://git.kernel.org/tip/5f1dd4dda5c8796c405e856aaa11e187f6885924
Author:        Borislav Petkov <bp@xxxxxxx>
AuthorDate:    Tue, 18 Aug 2020 12:28:31 +02:00
Committer:     Borislav Petkov <bp@xxxxxxx>
CommitterDate: Mon, 24 Aug 2020 18:18:32 +02:00

x86/fsgsbase: Replace static_cpu_has() with boot_cpu_has()

ptrace and prctl() are not really fast paths to warrant the use of
static_cpu_has() and cause alternatives patching for no good reason.
Replace with boot_cpu_has() which is simple and fast enough.

No functional changes.

Signed-off-by: Borislav Petkov <bp@xxxxxxx>
Link: https://lkml.kernel.org/r/20200818103715.32736-1-bp@xxxxxxxxx
---
 arch/x86/include/asm/fsgsbase.h | 4 ++--
 arch/x86/kernel/process_64.c    | 8 ++++----
 2 files changed, 6 insertions(+), 6 deletions(-)

diff --git a/arch/x86/include/asm/fsgsbase.h b/arch/x86/include/asm/fsgsbase.h
index d552646..35cff5f 100644
--- a/arch/x86/include/asm/fsgsbase.h
+++ b/arch/x86/include/asm/fsgsbase.h
@@ -57,7 +57,7 @@ static inline unsigned long x86_fsbase_read_cpu(void)
 {
 	unsigned long fsbase;
 
-	if (static_cpu_has(X86_FEATURE_FSGSBASE))
+	if (boot_cpu_has(X86_FEATURE_FSGSBASE))
 		fsbase = rdfsbase();
 	else
 		rdmsrl(MSR_FS_BASE, fsbase);
@@ -67,7 +67,7 @@ static inline unsigned long x86_fsbase_read_cpu(void)
 
 static inline void x86_fsbase_write_cpu(unsigned long fsbase)
 {
-	if (static_cpu_has(X86_FEATURE_FSGSBASE))
+	if (boot_cpu_has(X86_FEATURE_FSGSBASE))
 		wrfsbase(fsbase);
 	else
 		wrmsrl(MSR_FS_BASE, fsbase);
diff --git a/arch/x86/kernel/process_64.c b/arch/x86/kernel/process_64.c
index 9afefe3..df342be 100644
--- a/arch/x86/kernel/process_64.c
+++ b/arch/x86/kernel/process_64.c
@@ -407,7 +407,7 @@ unsigned long x86_gsbase_read_cpu_inactive(void)
 {
 	unsigned long gsbase;
 
-	if (static_cpu_has(X86_FEATURE_FSGSBASE)) {
+	if (boot_cpu_has(X86_FEATURE_FSGSBASE)) {
 		unsigned long flags;
 
 		local_irq_save(flags);
@@ -422,7 +422,7 @@ unsigned long x86_gsbase_read_cpu_inactive(void)
 
 void x86_gsbase_write_cpu_inactive(unsigned long gsbase)
 {
-	if (static_cpu_has(X86_FEATURE_FSGSBASE)) {
+	if (boot_cpu_has(X86_FEATURE_FSGSBASE)) {
 		unsigned long flags;
 
 		local_irq_save(flags);
@@ -439,7 +439,7 @@ unsigned long x86_fsbase_read_task(struct task_struct *task)
 
 	if (task == current)
 		fsbase = x86_fsbase_read_cpu();
-	else if (static_cpu_has(X86_FEATURE_FSGSBASE) ||
+	else if (boot_cpu_has(X86_FEATURE_FSGSBASE) ||
 		 (task->thread.fsindex == 0))
 		fsbase = task->thread.fsbase;
 	else
@@ -454,7 +454,7 @@ unsigned long x86_gsbase_read_task(struct task_struct *task)
 
 	if (task == current)
 		gsbase = x86_gsbase_read_cpu_inactive();
-	else if (static_cpu_has(X86_FEATURE_FSGSBASE) ||
+	else if (boot_cpu_has(X86_FEATURE_FSGSBASE) ||
 		 (task->thread.gsindex == 0))
 		gsbase = task->thread.gsbase;
 	else