From a7bf0bd5e6af7fe69342dabf2a3b721f0163469a Mon Sep 17 00:00:00 2001 From: Jeremy Fitzhardinge Date: Wed, 28 May 2008 15:02:14 +0100 Subject: build: add __page_aligned_data and __page_aligned_bss Making a variable page-aligned by using __attribute__((section(".data.page_aligned"))) is fragile because if sizeof(variable) is not also a multiple of page size, it leaves variables in the remainder of the section unaligned. This patch introduces two new qualifiers, __page_aligned_data and __page_aligned_bss to set the section *and* the alignment of variables. This makes page-aligned variables more robust because the linker will make sure they're aligned properly. Unfortunately it requires *all* page-aligned data to use these macros... Signed-off-by: Ingo Molnar --- arch/x86/kernel/setup64.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'arch/x86/kernel/setup64.c') diff --git a/arch/x86/kernel/setup64.c b/arch/x86/kernel/setup64.c index 631ea6c..fc1a56d 100644 --- a/arch/x86/kernel/setup64.c +++ b/arch/x86/kernel/setup64.c @@ -40,7 +40,7 @@ EXPORT_SYMBOL(_cpu_pda); struct desc_ptr idt_descr = { 256 * 16 - 1, (unsigned long) idt_table }; -char boot_cpu_stack[IRQSTACKSIZE] __attribute__((section(".bss.page_aligned"))); +char boot_cpu_stack[IRQSTACKSIZE] __page_aligned_bss; unsigned long __supported_pte_mask __read_mostly = ~0UL; EXPORT_SYMBOL_GPL(__supported_pte_mask); -- cgit v1.1