AuxXxilium/linux_dsm_epyc7002
1
0
Fork 0
mirror of https://github.com/AuxXxilium/linux_dsm_epyc7002.git synced 2025-02-14 17:47:57 +07:00
Code Issues Actions Packages Projects Releases Wiki Activity

x86/fpu: Simplify kernel_fpu_begin()

Browse Source 
Merge two helpers into the main function, remove a pointless local
variable and flatten a conditional.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
Cc: Dave Hansen <dave.hansen@intel.com>
Cc: "H. Peter Anvin" <hpa@zytor.com>
Cc: Ingo Molnar <mingo@redhat.com>
Cc: Nicolai Stange <nstange@suse.de>
Cc: Rik van Riel <riel@surriel.com>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: x86-ml <x86@kernel.org>
Link: https://lkml.kernel.org/r/20190604071524.12835-3-hch@lst.de
This commit is contained in:
Christoph Hellwig 2019-06-04 09:15:23 +02:00 committed by Borislav Petkov
parent b78ea19ac2
commit 6d79d86f96
1 changed files with 16 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
arch/x86/kernel/fpu/core.c
View File

@ -43,12 +43,6 @@ static DEFINE_PER_CPU(bool, in_kernel_fpu);
*/
DEFINE_PER_CPU(struct fpu *, fpu_fpregs_owner_ctx);
static void kernel_fpu_disable(void)
{
WARN_ON_FPU(this_cpu_read(in_kernel_fpu));
this_cpu_write(in_kernel_fpu, true);
}
static bool kernel_fpu_disabled(void)
{
return this_cpu_read(in_kernel_fpu);
@ -88,31 +82,25 @@ bool irq_fpu_usable(void)
}
EXPORT_SYMBOL(irq_fpu_usable);
static void __kernel_fpu_begin(void)
{
struct fpu *fpu = &current->thread.fpu;
WARN_ON_FPU(!irq_fpu_usable());
kernel_fpu_disable();
if (!(current->flags & PF_KTHREAD)) {
if (!test_thread_flag(TIF_NEED_FPU_LOAD)) {
set_thread_flag(TIF_NEED_FPU_LOAD);
/*
* Ignore return value -- we don't care if reg state
* is clobbered.
*/
copy_fpregs_to_fpstate(fpu);
}
}
__cpu_invalidate_fpregs_state();
}
void kernel_fpu_begin(void)
{
preempt_disable();
__kernel_fpu_begin();
WARN_ON_FPU(!irq_fpu_usable());
WARN_ON_FPU(this_cpu_read(in_kernel_fpu));
this_cpu_write(in_kernel_fpu, true);
if (!(current->flags & PF_KTHREAD) &&
!test_thread_flag(TIF_NEED_FPU_LOAD)) {
set_thread_flag(TIF_NEED_FPU_LOAD);
/*
* Ignore return value -- we don't care if reg state
* is clobbered.
*/
copy_fpregs_to_fpstate(&current->thread.fpu);
}
__cpu_invalidate_fpregs_state();
}
EXPORT_SYMBOL_GPL(kernel_fpu_begin);