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[PATCH] x86/FPU: make vcpu_reset_fpu() build again with old gcc
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Jan Beulich <jbeulich@xxxxxxxx>
- Date: Mon, 9 Dec 2024 16:13:38 +0100
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- Cc: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>, Roger Pau Monné <roger.pau@xxxxxxxxxx>, Alejandro Vallejo <alejandro.vallejo@xxxxxxxxx>
- Delivery-date: Mon, 09 Dec 2024 15:13:53 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
Fields of anonymous structs/unions may not be part of an initializer for
rather old gcc.
Fixes: 49a068471d77 ("x86/fpu: Rework fpu_setup_fpu() uses to split it in two")
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/i387.c
+++ b/xen/arch/x86/i387.c
@@ -306,13 +306,13 @@ void vcpu_reset_fpu(struct vcpu *v)
{
v->fpu_initialised = false;
*v->arch.xsave_area = (struct xsave_struct) {
- .fpu_sse = {
- .mxcsr = MXCSR_DEFAULT,
- .fcw = FCW_RESET,
- .ftw = FXSAVE_FTW_RESET,
- },
.xsave_hdr.xstate_bv = X86_XCR0_X87,
};
+
+ /* Old gcc doesn't permit these to be part of the initializer. */
+ v->arch.xsave_area->fpu_sse.mxcsr = MXCSR_DEFAULT;
+ v->arch.xsave_area->fpu_sse.fcw = FCW_RESET;
+ v->arch.xsave_area->fpu_sse.ftw = FXSAVE_FTW_RESET;
}
void vcpu_setup_fpu(struct vcpu *v, const void *data)
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