lk/linux-kernel-test
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

build: add __page_aligned_data and __page_aligned_bss

Browse Source 
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 <mingo@elte.hu>
This commit is contained in:
Jeremy Fitzhardinge
2008-05-28 15:02:14 +01:00
committed by Ingo Molnar
parent 1ecd27657b
commit a7bf0bd5e6
3 changed files with 6 additions and 3 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
arch/x86/mm/ioremap.c
View File

@@ -394,8 +394,7 @@ static int __init early_ioremap_debug_setup(char *str)
early_param("early_ioremap_debug", early_ioremap_debug_setup);
static __initdata int after_paging_init;
static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)]
__section(.bss.page_aligned);
static pte_t bm_pte[PAGE_SIZE/sizeof(pte_t)] __page_aligned_bss;
static inline pmd_t * __init early_ioremap_pmd(unsigned long addr)
{