The patch titled
Generic ioremap_page_range: flush_cache_vmap
has been removed from the -mm tree. Its filename is
generic-ioremap_page_range-flush_cache_vmap.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
Subject: Generic ioremap_page_range: flush_cache_vmap
From: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx>
The existing implementation of ioremap_page_range(), which was taken
from i386, does this:
flush_cache_all();
/* modify page tables */
flush_tlb_all();
I think this is a bit defensive, so this patch changes the generic
implementation to do:
/* modify page tables */
flush_cache_vmap(start, end);
instead, which is similar to what vmalloc() does. This should still
be correct because we never modify existing PTEs. According to
James Bottomley:
The problem the flush_tlb_all() is trying to solve is to avoid stale tlb
entries in the ioremap area. We're just being conservative by flushing
on both map and unmap. Technically what vmalloc/vfree does (only flush
the tlb on unmap) is just fine because it means that the only tlb
entries in the remap area must belong to in-use mappings.
Signed-off-by: Haavard Skinnemoen <hskinnemoen@xxxxxxxxx>
Cc: Richard Henderson <rth@xxxxxxxxxxx>
Cc: Ivan Kokshaysky <ink@xxxxxxxxxxxxxxxxxxxx>
Cc: Russell King <rmk@xxxxxxxxxxxxxxxx>
Cc: Mikael Starvik <starvik@xxxxxxxx>
Cc: Andi Kleen <ak@xxxxxxx>
Cc: <linux-m32r@xxxxxxxxxxxxxxxxx>
Cc: Ralf Baechle <ralf@xxxxxxxxxxxxxx>
Cc: Kyle McMartin <kyle@xxxxxxxxxxxxxxxx>
Cc: Martin Schwidefsky <schwidefsky@xxxxxxxxxx>
Cc: Paul Mundt <lethal@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
lib/ioremap.c | 4 +---
1 file changed, 1 insertion(+), 3 deletions(-)
diff -puN lib/ioremap.c~generic-ioremap_page_range-flush_cache_vmap lib/ioremap.c
--- a/lib/ioremap.c~generic-ioremap_page_range-flush_cache_vmap
+++ a/lib/ioremap.c
@@ -76,8 +76,6 @@ int ioremap_page_range(unsigned long add
BUG_ON(addr >= end);
- flush_cache_all();
-
start = addr;
phys_addr -= addr;
pgd = pgd_offset_k(addr);
@@ -88,7 +86,7 @@ int ioremap_page_range(unsigned long add
break;
} while (pgd++, addr = next, addr != end);
- flush_tlb_all();
+ flush_cache_vmap(start, end);
return err;
}
_
Patches currently in -mm which might be from hskinnemoen@xxxxxxxxx are
origin.patch
generic-ioremap_page_range-mips-conversion.patch
generic-ioremap_page_range-parisc-conversion.patch
generic-ioremap_page_range-s390-conversion.patch
generic-ioremap_page_range-sh-conversion.patch
generic-ioremap_page_range-sh64-conversion.patch
avr32-implement-kernel_execve.patch
-
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