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x86/retpoline: Remove unused replacement symbols 

Now that objtool no longer creates alternatives, these replacement
symbols are no longer needed, remove them.

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Borislav Petkov <bp@suse.de>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Tested-by: Alexei Starovoitov <ast@kernel.org>
Link: https://lore.kernel.org/r/20211026120309.915051744@infradead.org
This commit is contained in:
Peter Zijlstra 2021-10-26 14:01:37 +02:00
parent 134ab5bd18
commit 4fe79e710d
2 changed files with 0 additions and 52 deletions
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10
arch/x86/include/asm/asm-prototypes.h
View File

@ -24,14 +24,4 @@ extern void cmpxchg8b_emu(void);
extern asmlinkage void __x86_indirect_thunk_ ## reg (void);
#include <asm/GEN-for-each-reg.h>
#undef GEN
#define GEN(reg) \
extern asmlinkage void __x86_indirect_alt_call_ ## reg (void);
#include <asm/GEN-for-each-reg.h>
#undef GEN
#define GEN(reg) \
extern asmlinkage void __x86_indirect_alt_jmp_ ## reg (void);
#include <asm/GEN-for-each-reg.h>
#endif /* CONFIG_RETPOLINE */

42
arch/x86/lib/retpoline.S
View File

@ -40,36 +40,6 @@ SYM_FUNC_END(__x86_indirect_thunk_\reg)
.endm
/*
* This generates .altinstr_replacement symbols for use by objtool. They,
* however, must not actually live in .altinstr_replacement since that will be
* discarded after init, but module alternatives will also reference these
* symbols.
*
* Their names matches the "__x86_indirect_" prefix to mark them as retpolines.
*/
.macro ALT_THUNK reg
.align 1
SYM_FUNC_START_NOALIGN(__x86_indirect_alt_call_\reg)
ANNOTATE_RETPOLINE_SAFE
1: call *%\reg
2: .skip 5-(2b-1b), 0x90
SYM_FUNC_END(__x86_indirect_alt_call_\reg)
STACK_FRAME_NON_STANDARD(__x86_indirect_alt_call_\reg)
SYM_FUNC_START_NOALIGN(__x86_indirect_alt_jmp_\reg)
ANNOTATE_RETPOLINE_SAFE
1: jmp *%\reg
2: .skip 5-(2b-1b), 0x90
SYM_FUNC_END(__x86_indirect_alt_jmp_\reg)
STACK_FRAME_NON_STANDARD(__x86_indirect_alt_jmp_\reg)
.endm
/*
* Despite being an assembler file we can't just use .irp here
* because __KSYM_DEPS__ only uses the C preprocessor and would
@ -92,15 +62,3 @@ STACK_FRAME_NON_STANDARD(__x86_indirect_alt_jmp_\reg)
#undef GEN
#define GEN(reg) EXPORT_THUNK(reg)
#include <asm/GEN-for-each-reg.h>
#undef GEN
#define GEN(reg) ALT_THUNK reg
#include <asm/GEN-for-each-reg.h>
#undef GEN
#define GEN(reg) __EXPORT_THUNK(__x86_indirect_alt_call_ ## reg)
#include <asm/GEN-for-each-reg.h>
#undef GEN
#define GEN(reg) __EXPORT_THUNK(__x86_indirect_alt_jmp_ ## reg)
#include <asm/GEN-for-each-reg.h>