Linux 5.16 compat: restore FSR and FSAVE

Commit 3b52ccd introduced a flaw where FSR and FSAVE are not restored when using a Linux 5.16 kernel. These instructions are only used when XSAVE is not supported by the processor meaning only some systems will encounter this issue. Reviewed-by: Tony Hutter <[email protected]> Reviewed-by: Attila Fülöp <[email protected]> Signed-off-by: Brian Behlendorf <[email protected]> Closes #13210 Closes #13236
openzfs · Mar 19, 2022 · 6b444cb · 6b444cb
1 parent 565089f
commit 6b444cb
Showing 1 changed file with 2 additions and 2 deletions.
diff --git a/include/os/linux/kernel/linux/simd_x86.h b/include/os/linux/kernel/linux/simd_x86.h
@@ -379,9 +379,9 @@ kfpu_end(void)
 	if (static_cpu_has(X86_FEATURE_XSAVE)) {
 		kfpu_do_xrstor("xrstor", state, ~0);
 	} else if (static_cpu_has(X86_FEATURE_FXSR)) {
-		kfpu_save_fxsr(state);
+		kfpu_restore_fxsr(state);
 	} else {
-		kfpu_save_fsave(state);
+		kfpu_restore_fsave(state);
 	}
 out:
 	local_irq_enable();