| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 083/193] x86/boot: Avoid warning for zero-filling .bss | Date | Fri, 23 Feb 2018 19:25:16 +0100 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Arnd Bergmann <arnd@arndb.de>
commit 553bbc11aa6c1f9e0f529a06aeeca15fbe4a3985 upstream.
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> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
--- arch/x86/kernel/head_32.S | 9 ++++++--- 1 file changed, 6 insertions(+), 3 deletions(-)
--- a/arch/x86/kernel/head_32.S +++ b/arch/x86/kernel/head_32.S @@ -669,14 +669,17 @@ __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 /*
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