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

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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@suse.de>
Link: https://lkml.kernel.org/r/20200818103715.32736-1-bp@alien8.de
This commit is contained in:
Borislav Petkov 2020-08-18 12:28:31 +02:00
parent 0b2c605fa4
commit 5f1dd4dda5
2 changed files with 6 additions and 6 deletions
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4
arch/x86/include/asm/fsgsbase.h
View file

@ -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);

8
arch/x86/kernel/process_64.c
View file

@ -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