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x86/extable: Prefer local labels in .set directives
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Bernardo reported an error that Nathan bisected down to
(x86_64) defconfig+LTO_CLANG_FULL+X86_PMEM_LEGACY.

    LTO     vmlinux.o
  ld.lld: error: <instantiation>:1:13: redefinition of 'found'
  .set found, 0
              ^

  <inline asm>:29:1: while in macro instantiation
  extable_type_reg reg=%eax, type=(17 | ((0) << 16))
  ^

This appears to be another LTO specific issue similar to what was folded
into commit 4b5305d ("x86/extable: Extend extable functionality"),
where the `.set found, 0` in DEFINE_EXTABLE_TYPE_REG in
arch/x86/include/asm/asm.h conflicts with the symbol for the static
function `found` in arch/x86/kernel/pmem.c.

Assembler .set directive declare symbols with global visibility, so the
assembler may not rename such symbols in the event of a conflict. LTO
could rename static functions if there was a conflict in C sources, but
it cannot see into symbols defined in inline asm.

The symbols are also retained in the symbol table, regardless of LTO.

Give the symbols .L prefixes making them locally visible, so that they
may be renamed for LTO to avoid conflicts, and to drop them from the
symbol table regardless of LTO.

Fixes: 4b5305d ("x86/extable: Extend extable functionality")
Reported-by: Bernardo Meurer Costa <[email protected]>
Debugged-by: Nathan Chancellor <[email protected]>
Signed-off-by: Nick Desaulniers <[email protected]>
Signed-off-by: Peter Zijlstra (Intel) <[email protected]>
Reviewed-by: Nathan Chancellor <[email protected]>
Tested-by: Nathan Chancellor <[email protected]>
Link: https://lore.kernel.org/r/[email protected]
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nickdesaulniers authored and Peter Zijlstra committed Apr 7, 2022
1 parent be8a096 commit 334865b
Showing 1 changed file with 10 additions and 10 deletions.
20 changes: 10 additions & 10 deletions arch/x86/include/asm/asm.h
Original file line number Diff line number Diff line change
Expand Up @@ -154,24 +154,24 @@

# define DEFINE_EXTABLE_TYPE_REG \
".macro extable_type_reg type:req reg:req\n" \
".set found, 0\n" \
".set regnr, 0\n" \
".set .Lfound, 0\n" \
".set .Lregnr, 0\n" \
".irp rs,rax,rcx,rdx,rbx,rsp,rbp,rsi,rdi,r8,r9,r10,r11,r12,r13,r14,r15\n" \
".ifc \\reg, %%\\rs\n" \
".set found, found+1\n" \
".long \\type + (regnr << 8)\n" \
".set .Lfound, .Lfound+1\n" \
".long \\type + (.Lregnr << 8)\n" \
".endif\n" \
".set regnr, regnr+1\n" \
".set .Lregnr, .Lregnr+1\n" \
".endr\n" \
".set regnr, 0\n" \
".set .Lregnr, 0\n" \
".irp rs,eax,ecx,edx,ebx,esp,ebp,esi,edi,r8d,r9d,r10d,r11d,r12d,r13d,r14d,r15d\n" \
".ifc \\reg, %%\\rs\n" \
".set found, found+1\n" \
".long \\type + (regnr << 8)\n" \
".set .Lfound, .Lfound+1\n" \
".long \\type + (.Lregnr << 8)\n" \
".endif\n" \
".set regnr, regnr+1\n" \
".set .Lregnr, .Lregnr+1\n" \
".endr\n" \
".if (found != 1)\n" \
".if (.Lfound != 1)\n" \
".error \"extable_type_reg: bad register argument\"\n" \
".endif\n" \
".endm\n"
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