Commit-ID: 685c930d6e58e31e251ec354f9dca3958a4c5040
Gitweb: http://git.kernel.org/tip/685c930d6e58e31e251ec354f9dca3958a4c5040
Author: Ingo Molnar <mingo@xxxxxxxxxx>
AuthorDate: Sat, 23 Sep 2017 15:00:11 +0200
Committer: Ingo Molnar <mingo@xxxxxxxxxx>
CommitDate: Tue, 26 Sep 2017 09:42:20 +0200
x86/fpu: Remove fpu__current_fpstate_write_begin/end()
These functions are not used anymore, so remove them.
Cc: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxxxxxx>
Cc: Bobby Powers <bobbypowers@xxxxxxxxx>
Cc: Borislav Petkov <bp@xxxxxxxxx>
Cc: Dave Hansen <dave.hansen@xxxxxxxxxxxxxxx>
Cc: Eric Biggers <ebiggers3@xxxxxxxxx>
Cc: Fenghua Yu <fenghua.yu@xxxxxxxxx>
Cc: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Peter Zijlstra <peterz@xxxxxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Yu-cheng Yu <yu-cheng.yu@xxxxxxxxx>
Link: http://lkml.kernel.org/r/20170923130016.21448-29-mingo@xxxxxxxxxx
Signed-off-by: Ingo Molnar <mingo@xxxxxxxxxx>
---
arch/x86/include/asm/fpu/internal.h | 2 --
arch/x86/kernel/fpu/core.c | 63 -------------------------------------
2 files changed, 65 deletions(-)
diff --git a/arch/x86/include/asm/fpu/internal.h b/arch/x86/include/asm/fpu/internal.h
index cf290d4..508e418 100644
--- a/arch/x86/include/asm/fpu/internal.h
+++ b/arch/x86/include/asm/fpu/internal.h
@@ -26,8 +26,6 @@
extern void fpu__activate_curr(struct fpu *fpu);
extern void fpu__activate_fpstate_read(struct fpu *fpu);
extern void fpu__activate_fpstate_write(struct fpu *fpu);
-extern void fpu__current_fpstate_write_begin(void);
-extern void fpu__current_fpstate_write_end(void);
extern void fpu__save(struct fpu *fpu);
extern void fpu__restore(struct fpu *fpu);
extern int fpu__restore_sig(void __user *buf, int ia32_frame);
diff --git a/arch/x86/kernel/fpu/core.c b/arch/x86/kernel/fpu/core.c
index afd3f2a..b2cdeb3 100644
--- a/arch/x86/kernel/fpu/core.c
+++ b/arch/x86/kernel/fpu/core.c
@@ -317,69 +317,6 @@ void fpu__activate_fpstate_write(struct fpu *fpu)
}
/*
- * This function must be called before we write the current
- * task's fpstate.
- *
- * This call gets the current FPU register state and moves
- * it in to the 'fpstate'. Preemption is disabled so that
- * no writes to the 'fpstate' can occur from context
- * swiches.
- *
- * Must be followed by a fpu__current_fpstate_write_end().
- */
-void fpu__current_fpstate_write_begin(void)
-{
- struct fpu *fpu = ¤t->thread.fpu;
-
- /*
- * Ensure that the context-switching code does not write
- * over the fpstate while we are doing our update.
- */
- preempt_disable();
-
- /*
- * Move the fpregs in to the fpu's 'fpstate'.
- */
- fpu__activate_fpstate_read(fpu);
-
- /*
- * The caller is about to write to 'fpu'. Ensure that no
- * CPU thinks that its fpregs match the fpstate. This
- * ensures we will not be lazy and skip a XRSTOR in the
- * future.
- */
- __fpu_invalidate_fpregs_state(fpu);
-}
-
-/*
- * This function must be paired with fpu__current_fpstate_write_begin()
- *
- * This will ensure that the modified fpstate gets placed back in
- * the fpregs if necessary.
- *
- * Note: This function may be called whether or not an _actual_
- * write to the fpstate occurred.
- */
-void fpu__current_fpstate_write_end(void)
-{
- struct fpu *fpu = ¤t->thread.fpu;
-
- /*
- * 'fpu' now has an updated copy of the state, but the
- * registers may still be out of date. Update them with
- * an XRSTOR if they are active.
- */
- if (fpu->fpstate_active)
- copy_kernel_to_fpregs(&fpu->state);
-
- /*
- * Our update is done and the fpregs/fpstate are in sync
- * if necessary. Context switches can happen again.
- */
- preempt_enable();
-}
-
-/*
* 'fpu__restore()' is called to copy FPU registers from
* the FPU fpstate to the live hw registers and to activate
* access to the hardware registers, so that FPU instructions
--
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