The zsmalloc [un]maps non-physical contiguos pages to contiguous
virual address frequently so it needs frequent tlb-flush.
Now x86 doesn't support common utility function for flushing just
a few tlb entries so zsmalloc have been used set_pte and __flush_tlb_one
which are x86 specific functions. It means zsmalloc have a dependency
with x86.
This patch adds new function, local_flush_tlb_kernel_range which
are good candidate for being common utility function because other
architecture(ex, MIPS, sh, unicore32, arm, score) already have
supportd it.
Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx>
Cc: Ingo Molnar <mingo@xxxxxxxxxx>
Cc: Tejun Heo <tj@xxxxxxxxxx>
Cc: David Howells <dhowells@xxxxxxxxxx>
Cc: x86@xxxxxxxxxx
Signed-off-by: Minchan Kim <minchan@xxxxxxxxxx>
---
arch/x86/include/asm/tlbflush.h | 12 ++++++++++++
drivers/staging/zsmalloc/Kconfig | 2 +-
2 files changed, 13 insertions(+), 1 deletion(-)
diff --git a/arch/x86/include/asm/tlbflush.h b/arch/x86/include/asm/tlbflush.h
index 4ece077..6e1253a 100644
--- a/arch/x86/include/asm/tlbflush.h
+++ b/arch/x86/include/asm/tlbflush.h
@@ -172,4 +172,16 @@ static inline void flush_tlb_kernel_range(unsigned long start,
flush_tlb_all();
}
+static inline void local_flush_tlb_kernel_range(unsigned long start,
+ unsigned long end)
+{
+ if (cpu_has_invlpg) {
+ while (start < end) {
+ __flush_tlb_single(start);
+ start += PAGE_SIZE;
+ }
+ } else
+ local_flush_tlb();
+}
+
#endif /* _ASM_X86_TLBFLUSH_H */
diff --git a/drivers/staging/zsmalloc/Kconfig b/drivers/staging/zsmalloc/Kconfig
index def2483..29819b8 100644
--- a/drivers/staging/zsmalloc/Kconfig
+++ b/drivers/staging/zsmalloc/Kconfig
@@ -3,7 +3,7 @@ config ZSMALLOC
# arch dependency is because of the use of local_unmap_kernel_range
# in zsmalloc-main.c.
# TODO: implement local_unmap_kernel_range in all architecture.
- depends on (ARM || MIPS || SUPERH)
+ depends on (ARM || MIPS || SUPERH || X86)
default n
help
zsmalloc is a slab-based memory allocator designed to store
--
1.7.9.5
--
To unsubscribe, send a message with 'unsubscribe linux-mm' in
the body to majordomo@xxxxxxxxx. For more info on Linux MM,
see: http://www.linux-mm.org/ .
Fight unfair telecom internet charges in Canada: sign http://stopthemeter.ca/
Don't email: <a href=mailto:"dont@xxxxxxxxx";> email@xxxxxxxxx </a>