[PATCH] [4/12] x86_64: Disable CLFLUSH support again

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

 



It turns out CLFLUSH support is still not complete; we
flush the wrong pages.  Again disable it for the release.
Noticed by Jan Beulich.

Signed-off-by: Andi Kleen <[email protected]>

---
 arch/i386/mm/pageattr.c   |    2 +-
 arch/x86_64/mm/pageattr.c |    3 ++-
 2 files changed, 3 insertions(+), 2 deletions(-)

Index: linux/arch/i386/mm/pageattr.c
===================================================================
--- linux.orig/arch/i386/mm/pageattr.c
+++ linux/arch/i386/mm/pageattr.c
@@ -82,7 +82,7 @@ static void flush_kernel_map(void *arg)
 	struct page *p;
 
 	/* High level code is not ready for clflush yet */
-	if (cpu_has_clflush) {
+	if (0 && cpu_has_clflush) {
 		list_for_each_entry (p, lh, lru)
 			cache_flush_page(p);
 	} else if (boot_cpu_data.x86_model >= 4)
Index: linux/arch/x86_64/mm/pageattr.c
===================================================================
--- linux.orig/arch/x86_64/mm/pageattr.c
+++ linux/arch/x86_64/mm/pageattr.c
@@ -75,7 +75,8 @@ static void flush_kernel_map(void *arg)
 
 	/* When clflush is available always use it because it is
 	   much cheaper than WBINVD. */
-	if (!cpu_has_clflush)
+	/* clflush is still broken. Disable for now. */
+	if (0 && !cpu_has_clflush)
 		asm volatile("wbinvd" ::: "memory");
 	else list_for_each_entry(pg, l, lru) {
 		void *adr = page_address(pg);
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to [email protected]
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/

[Index of Archives]     [Kernel Newbies]     [Netfilter]     [Bugtraq]     [Photo]     [Stuff]     [Gimp]     [Yosemite News]     [MIPS Linux]     [ARM Linux]     [Linux Security]     [Linux RAID]     [Video 4 Linux]     [Linux for the blind]     [Linux Resources]
  Powered by Linux