Messages in this thread Patch in this message | | | Date | Mon, 23 Oct 2006 15:29:23 -0400 | From | Vivek Goyal <> | Subject | [PATCH 2/11] i386: Remove unnecessary ALIGN() in vmlinux.lds.S |
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o There seems to be one extra ALIGN(4096) before symbol __smp_alt_end. The only usage of __smp_alt_end is to mark the end of smp alternative sections so that this memory can be freed. As a physical page is freed one has to just make sure that there is no other data on the same page where __smp_alt_end is pointing. There is already a ALIGN(4096) after this section which should take care of the above issue. Hence it looks like the ALIGN(4096) before __smp_alt_end is redundant and not required.
Signed-off-by: Vivek Goyal <vgoyal@in.ibm.com> ---
arch/i386/kernel/vmlinux.lds.S | 8 ++++++-- 1 file changed, 6 insertions(+), 2 deletions(-)
diff -puN arch/i386/kernel/vmlinux.lds.S~i386-remove-unnecessary-align-option arch/i386/kernel/vmlinux.lds.S --- linux-2.6.19-rc2-git7-reloc/arch/i386/kernel/vmlinux.lds.S~i386-remove-unnecessary-align-option 2006-10-23 13:15:21.000000000 -0400 +++ linux-2.6.19-rc2-git7-reloc-root/arch/i386/kernel/vmlinux.lds.S 2006-10-23 15:09:02.000000000 -0400 @@ -112,11 +112,15 @@ SECTIONS } .smp_altinstr_replacement : AT(ADDR(.smp_altinstr_replacement) - LOAD_OFFSET) { *(.smp_altinstr_replacement) - . = ALIGN(4096); __smp_alt_end = .; } - /* will be freed after init */ + /* will be freed after init + * Following ALIGN() is required to make sure no other data falls on the + * same page where __smp_alt_end is pointing as that page might be freed + * after boot. Always make sure that ALIGN() directive is present after + * the section which contains __smp_alt_end. + */ . = ALIGN(4096); /* Init code and data */ .init.text : AT(ADDR(.init.text) - LOAD_OFFSET) { __init_begin = .; _ - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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