The patch titled Subject: cma: make default CMA area size zero for x86 has been removed from the -mm tree. Its filename was cma-make-default-cma-area-size-zero-for-x86.patch This patch was dropped because it was merged into mainline or a subsystem tree ------------------------------------------------------ From: Akinobu Mita <akinobu.mita@xxxxxxxxx> Subject: cma: make default CMA area size zero for x86 This makes CMA memory area size zero for x86 in default configuration (doesn't change on the other architectures). If default CMA size is zero, DMA_CMA is disabled. It can be enabled by passing cma= to the kernel. This makes less impact on x86. Because there is no mainline driver that requires it for x86, and Peter Hurley reported the performance regression, as this is trying to drive _all_ dma mapping allocations through a _very_ small window. Signed-off-by: Akinobu Mita <akinobu.mita@xxxxxxxxx> Reported-by: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> Cc: Peter Hurley <peter@xxxxxxxxxxxxxxxxxx> Cc: Chuck Ebbert <cebbert.lkml@xxxxxxxxx> Cc: Jean Delvare <jdelvare@xxxxxxx> Acked-by: Marek Szyprowski <m.szyprowski@xxxxxxxxxxx> Cc: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> Cc: David Woodhouse <dwmw2@xxxxxxxxxxxxx> Cc: Don Dutile <ddutile@xxxxxxxxxx> Cc: Thomas Gleixner <tglx@xxxxxxxxxxxxx> Cc: Ingo Molnar <mingo@xxxxxxxxxx> Cc: "H. Peter Anvin" <hpa@xxxxxxxxx> Cc: Andi Kleen <andi@xxxxxxxxxxxxxx> Cc: Yinghai Lu <yinghai@xxxxxxxxxx> Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx> --- drivers/base/Kconfig | 8 +++++++- 1 file changed, 7 insertions(+), 1 deletion(-) diff -puN drivers/base/Kconfig~cma-make-default-cma-area-size-zero-for-x86 drivers/base/Kconfig --- a/drivers/base/Kconfig~cma-make-default-cma-area-size-zero-for-x86 +++ a/drivers/base/Kconfig @@ -267,18 +267,24 @@ comment "Default contiguous memory area config CMA_SIZE_MBYTES int "Size in Mega Bytes" depends on !CMA_SIZE_SEL_PERCENTAGE + default 0 if X86 default 16 help Defines the size (in MiB) of the default memory area for Contiguous - Memory Allocator. + Memory Allocator. If the size of 0 is selected, CMA is disabled by + default, but it can be enabled by passing cma=size[MG] to the kernel. + config CMA_SIZE_PERCENTAGE int "Percentage of total memory" depends on !CMA_SIZE_SEL_MBYTES + default 0 if X86 default 10 help Defines the size of the default memory area for Contiguous Memory Allocator as a percentage of the total memory in the system. + If 0 percent is selected, CMA is disabled by default, but it can be + enabled by passing cma=size[MG] to the kernel. choice prompt "Selected region size" _ Patches currently in -mm which might be from akinobu.mita@xxxxxxxxx are origin.patch ratelimit-add-initialization-macro.patch fault-inject-add-ratelimit-option-v2.patch linux-next.patch -- To unsubscribe from this list: send the line "unsubscribe mm-commits" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html