x86/fpu: Remove unused get_xsave_field_ptr()

mainline inclusion
from mainline-v5.14-rc1
commit 4098b3ee
category: feature
bugzilla: https://gitee.com/openeuler/intel-kernel/issues/I590ZC
CVE: NA

Intel-SIG: commit 4098b3ee x86/fpu: Remove unused get_xsave_field_ptr().

--------------------------------
Signed-off-by: NThomas Gleixner <tglx@linutronix.de>
Signed-off-by: NBorislav Petkov <bp@suse.de>
Reviewed-by: NAndy Lutomirski <luto@kernel.org>
Reviewed-by: NBorislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210623121451.915614415@linutronix.deSigned-off-by: NLin Wang <lin.x.wang@intel.com>

arch/x86/include/asm/fpu/xstate.h

@@ -101,7 +101,6 @@ extern void __init update_regset_xstate_info(unsigned int size,
 					     u64 xstate_mask);
 
 void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr);
-const void *get_xsave_field_ptr(int xfeature_nr);
 int using_compacted_format(void);
 int xfeature_size(int xfeature_nr);
 struct membuf;

arch/x86/kernel/fpu/xstate.c

@@ -998,36 +998,6 @@ void *get_xsave_addr(struct xregs_state *xsave, int xfeature_nr)
 }
 EXPORT_SYMBOL_GPL(get_xsave_addr);
 
-/*
- * This wraps up the common operations that need to occur when retrieving
- * data from xsave state.  It first ensures that the current task was
- * using the FPU and retrieves the data in to a buffer.  It then calculates
- * the offset of the requested field in the buffer.
- *
- * This function is safe to call whether the FPU is in use or not.
- *
- * Note that this only works on the current task.
- *
- * Inputs:
- *	@xfeature_nr: state which is defined in xsave.h (e.g. XFEATURE_FP,
- *	XFEATURE_SSE, etc...)
- * Output:
- *	address of the state in the xsave area or NULL if the state
- *	is not present or is in its 'init state'.
- */
-const void *get_xsave_field_ptr(int xfeature_nr)
-{
-	struct fpu *fpu = &current->thread.fpu;
-
-	/*
-	 * fpu__save() takes the CPU's xstate registers
-	 * and saves them off to the 'fpu memory buffer.
-	 */
-	fpu__save(fpu);
-
-	return get_xsave_addr(&fpu->state.xsave, xfeature_nr);
-}
-
 #ifdef CONFIG_ARCH_HAS_PKEYS
 
 /*