um: Add missing apply_returns()

Peter Zijlstra · suryasaimadhu · commit 564d99810639 · 2022-07-14T13:40:21.000+02:00
Implement apply_returns() stub for UM, just like all the other patching routines. Fixes: 15e6722 ("x86: Undo return-thunk damage") Reported-by: Randy Dunlap <rdunlap@infradead.org) Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/Ys%2Ft45l%2FgarIrD0u@worktop.programming.kicks-ass.net
diff --git a/arch/um/kernel/um_arch.c b/arch/um/kernel/um_arch.c
@@ -432,6 +432,10 @@ void apply_retpolines(s32 *start, s32 *end)
 {
 }
 
+void apply_returns(s32 *start, s32 *end)
+{
+}
+
 void apply_alternatives(struct alt_instr *start, struct alt_instr *end)
 {
 }

Original file line number	Diff line number	Diff line change
`@@ -432,6 +432,10 @@ void apply_retpolines(s32 start, s32 end)`
`432`	`432`	`{`
`433`	`433`	`}`
`434`	`434`
	`435`	`+void apply_returns(s32 start, s32 end)`
	`436`	`+{`
	`437`	`+}`
	`438`	`+`
`435`	`439`	`void apply_alternatives(struct alt_instr start, struct alt_instr end)`
`436`	`440`	`{`
`437`	`441`	`}`