| Message ID | 20130726155458.GA31613@arm.com |
|---|---|
| State | New |
| Headers | show |
On Fri, Jul 26, 2013 at 8:55 AM, Catalin Marinas <catalin.marinas@arm.com> wrote: > > - Stack size increased to 16K (similar to other 64-bit architectures) I pulled, but this is misleading. *Some* other 64-bit architectures do 16k stack sizes. But neither x86-64 nor powerpc do, afaik. Instead, they do irq stacks, which is generally a better idea than having one big stack. Linus
On Fri, 2013-07-26 at 12:54 -0700, Linus Torvalds wrote: > > *Some* other 64-bit architectures do 16k stack sizes. But neither > x86-64 nor powerpc do, afaik. Instead, they do irq stacks, which is > generally a better idea than having one big stack. Sadly you over estimated us here :-) We do 16K *and* irq stacks on 64-bit ... Remember our ABI with it's 112 bytes minimum per frame ? It's been a while since I've last audited our actual usage mind you, we *might* be able to reduce it but at this stage, since our typical configs use a 64K base page size, it's not a big deal (ie, it's not an order-N allocation). Cheers, Ben.
Hi Linus, Please pull the arm64 fixes below. Thanks. The following changes since commit 3b2f64d00c46e1e4e9bd0bb9bb12619adac27a4b: Linux 3.11-rc2 (2013-07-21 12:05:29 -0700) are available in the git repository at: git://git.kernel.org/pub/scm/linux/kernel/git/cmarinas/linux-aarch64.git tags/arm64-stable for you to fetch changes up to 845ad05ec31e0f3872a321e10dbeaf872022632c: arm64: Change kernel stack size to 16K (2013-07-26 13:37:29 +0100) ---------------------------------------------------------------- - Stack size increased to 16K (similar to other 64-bit architectures) - Additional cache flushing for secondary CPUs boot mode ---------------------------------------------------------------- Catalin Marinas (1): arm64: Fix definition of arm_pm_restart to match the declaration Feng Kan (1): arm64: Change kernel stack size to 16K Mark Rutland (1): arm64: virt: ensure visibility of __boot_cpu_mode arch/arm64/include/asm/thread_info.h | 4 ++-- arch/arm64/include/asm/virt.h | 13 +++++++++++++ arch/arm64/kernel/entry.S | 2 +- arch/arm64/kernel/process.c | 2 +- 4 files changed, 17 insertions(+), 4 deletions(-)