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x86/boot: Avoid warning for zero-filling .bss

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The latest binutils are warning about a .fill directive with an explicit
value in a .bss section:

  arch/x86/kernel/head_32.S: Assembler messages:
  arch/x86/kernel/head_32.S:677: Warning: ignoring fill value in section `.bss..page_aligned'
  arch/x86/kernel/head_32.S:679: Warning: ignoring fill value in section `.bss..page_aligned'

This comes from the 'ENTRY()' macro padding the space between the symbols
with 'nop' via:

  .align 4,0x90

Open-coding the .globl directive without the padding avoids that warning,
as all the symbols are already page aligned.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Cc: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Link: http://lkml.kernel.org/r/20161116141726.2013389-1-arnd@arndb.de
Signed-off-by: Ingo Molnar <mingo@kernel.org>
This commit is contained in:
Arnd Bergmann 2016-11-16 15:17:09 +01:00 committed by Ingo Molnar
parent f96acec8c8
commit 553bbc11aa
1 changed files with 6 additions and 3 deletions
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arch/x86/kernel/head_32.S
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@ -665,14 +665,17 @@ __PAGE_ALIGNED_BSS
initial_pg_pmd:
.fill 1024*KPMDS,4,0
#else
ENTRY(initial_page_table)
.globl initial_page_table
initial_page_table:
.fill 1024,4,0
#endif
initial_pg_fixmap:
.fill 1024,4,0
ENTRY(empty_zero_page)
.globl empty_zero_page
empty_zero_page:
.fill 4096,1,0
ENTRY(swapper_pg_dir)
.globl swapper_pg_dir
swapper_pg_dir:
.fill 1024,4,0
EXPORT_SYMBOL(empty_zero_page)