Because in i386 early boot stage, boot_cpu_data may be not available,
which makes clflush_cach_range() into infinite loop, which is called
by change_page_attr(). This patch fixes this by providing a default
clflush_size of 64. But the better method may be providing a
early_identify_cpu() for i386.
Signed-off-by: Huang Ying <[EMAIL PROTECTED]>
---
arch/x86/mm/pageattr.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/arch/x86/mm/pageattr.c
+++ b/arch/x86/mm/pageattr.c
@@ -36,11 +36,14 @@ within(unsigned long addr, unsigned long
*/
void clflush_cache_range(void *vaddr, unsigned int size)
{
+ int clflush_size;
void *vend = vaddr + size - 1;
mb();
- for (; vaddr < vend; vaddr += boot_cpu_data.x86_clflush_size)
+ /* In boot stage, boot_cpu_data may be not available */
+ clflush_size = boot_cpu_data.x86_clflush_size ? : 64;
+ for (; vaddr < vend; vaddr += clflush_size)
clflush(vaddr);
/*
* Flush any possible final partial cacheline:
--
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